Luiz Alexandre Peternelli

Federal University of Viçosa | UFV · Department of Statistics

The objective of this work was to define experimental blocks for sugarcane experiments using geostatistical techniques, principal component analysis, and clustering techniques applied to soil properties. For this, data of soil chemical properties from a sugarcane experiment were used. Geostatistical techniques were applied to identify the spatial v...

One of the challenges of sugarcane breeding programs is the initial selection of genotypes aimed at developing varieties. Following the hybridization of genitors and family production, the process generally consists of selecting the best families and individuals within those families. Furthermore, the traditional selection model based on experiment...

Resumo O ministério da agricultura e pecuária define a agricultura de precisão (AP) como um "um sistema de gerenciamento agrícola baseado na variação espacial e temporal da unidade produtiva e visa ao aumento de retorno econômico ao agricultor, à sustentabilidade e à minimização do efeito ao ambiente". Se a AP leva em consideração a variabilidade n...

Para realizar a interpolação por krigagem, é importante que cada ponto num semivariograma seja obtido com base no mínimo da combinação de 30 pares de pontos. Além disso, alguns autores alegam que é necessário ter pelo menos 100 amostras para fazer a interpolação. Sendo assim, o processo de amostragem se torna caro para o produtor. Como alternativa...

The GGE biplot analysis is an essential technique for optimizing genotype selection. However, it is particularly sensitive as its effectiveness depends on the genotypic effect, which can vary greatly according to the cultivation environment. This study thoroughly explores how the formation of mega-environments can be affected by the exclusion of sp...

Resumo As fases iniciais de seleção de cana-de-açúcar são caracterizadas por terem um número elevado de famílias, e em geral a avaliação demanda o corte e pesagem de todas as plantas do campo experimental, o que pode tornar o processo lento e oneroso. Assim, é grande o interesse por alternativas que contribuam para a eficiência do processo. Neste c...

Resumo A utilização de Veículos Aéreos não Tripulados (VANT) tem se mostrado uma ferramenta promissora para o setor agrícola. Diversos tipos de sensores embarcados nas aeronaves, dentre eles os termais, multiespectrais ou hiperespectrais, possibilitam a obtenção de informações por meio dos índices de vegetação (IV), que são composições das diversas...

The selection of better-evaluated genotypes for a target region depends on the characterization of the climate conditions of the environment. With the advancement of computer technology and daily available information about the weather, integrating such information in selection and interaction genotype × environment studies has become a challenge....

The present study aimed to compare the following selection indices: Smith and Hazel multiplicative, Mulamba and Mock's, and the support vector machines algorithm (SVM) for sugarcane families selection. We considered the genotypic values for family means of the tons of stalks per hectare per family (GVFTSH) as the ideal selection approach to select...

The image segmentation procedure is fundamental in the phenotyping of plant images. Supervised algorithms have been used for pixel soil plant segmentation. Recent research has used the K-means algorithm to evaluate the segmentation of agronomic images in different crops with different databases. The algorithm has shown good performance in the pixel...

The objective of this study was to evaluate soil chemical attributes in a soil conservation experiment for onion, under different cropping systems. The study was conducted on a Humic Dystrudept in Ituporanga, Santa Catarina state, Brazil. Eight different cropping systems for onion were evaluated: T1: maize-onion succession, T2: common vetch-maize/r...

Currently, there are several methods for adaptability and stability analyses, which are distinguished according to the adopted concepts of stability and statistical principles. This study aimed to compare the adaptability and stability methods of Eberhart and Russell (1966), Cruz et al. (1989), and Lin and Binns (1988) modified by Carneiro (1998),...

Genotype × environment (GE) interaction can difficult soybean breeding programs to achieve the aim of more productive cultivars. Environment stratification is a way to circumvent this problem. However, multiyear data studies are difficult to work with, because they are, usually, unbalanced. GGE Biplot is an efficient method to find mega-environment...

The simplified system (SS) is a new method of selecting families in the first experimentation phase used in some sugarcane (Saccharum officinarum L.) breeding programs in Brazil. In the SS, clones are obtained from families whose genotypes are not individualized in the field. Such selected clones are used to compose the cloned family trial. In the...

Splitting the whole dataset into training and testing subsets is a crucial part of optimizing models. This study evaluated the influence of the choice of the training subset in the construction of predictive models, as well as on their validation. For this purpose we assessed the Kennard-Stone (KS) and the Random Sampling (RS) methods in near-infra...

Genotype x enviroment (GE) interaction can difficult soybean breeding programs to atieve the aim of obtain more productive cultivars. Enviroment stratification is a way to circunvent this problem. This work aimed to gather GGE Biplot graphs of a network of trials unbalance multiyear soybean via matrices of coincidence and networks of enviroment to...

The main objectives of this study were to evaluate the prediction performance of genomic and near-infrared spectroscopy (NIR) data and whether the integration of genomic and NIR predictor variables can increase the prediction accuracy of two feedstock quality traits (fiber and sucrose content) in a sugarcane population (Saccharum spp.). The followi...

The progress of viral diseases such as the new coronavirus (COVID-19) can be influenced not only by social isolation policies, but also by climatic factors. Understanding how these factors affect the progress of the pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) may be essential to know the risks each country is fac...

The selection of genotypes at the early stages is one of the main challenges facing sugarcane (Saccharum officinarum L.) breeding programs. The present work aimed to compare classification techniques, namely, logistic regression (LR), k‐nearest neighbor (KNN), random forests (RF), and support vector machine (SVM) against the selection among familie...

Diatraea saccharalis constitutes a threat to the sugarcane productivity, and obtaining borer tolerant cultivars is an alternative method of control. Although there are studies about the relationship between the interaction of D. saccharalis with sugarcane, little is known about the molecular and genomic basis of defense mechanisms that confer toler...

The main objectives of this study were to evaluate the prediction performance of genomic and near-infrared spectroscopy (NIR) data and whether the integration of genomic and NIR predictor variables can increase the prediction accuracy of two feedstock quality traits (fiber and sucrose content) in a sugarcane population ( Saccharum spp.). The follow...

Sugarcane production plays a fundamental role in the Brazilian economy, both for sugar production and renewable energy generation. The development of new cultivars to meet the current needs of the sugarcane industry sector requires efficient phenotyping methods, which should incorporate simplification, speed, accuracy, and consistency. In order to...

Path analysis allows understanding the direct and indirect effects among traits. Multicollinearity in correlation matrices may cause a bias in path analysis estimates. This study aimed to: a) understand the correlation among soybean traits and estimate their direct and indirect effects on gain oil content; b) verify the efficiency of ridge path ana...

Background The identification of genomic regions involved in agronomic traits is the primary concern for sugarcane breeders. Genome-wide association studies (GWAS) leverage the sequence variations to bridge phenotypes and genotypes. However, their effectiveness is limited in species with high ploidy and large genomes, such as sugarcane. As an alter...

This study aimed to investigate genetic parameters and selection strategies for sugarcane resistance to borer and determine the effects of selection for borer resistance on yield traits. The infestation index by borer (IIB) and yield traits were assessed over 3 years in 35 sugarcane clones planted in four locations in southeastern Brazil. There was...

Consequence upon the geometrically rising world population and the increasing pressure on food items, it has become increasingly necessary to increase food production from the present level. The possibility of achieving this is not only to increase production but also to protect the crops cultivated. Crop protection can be achieved through sever...

The aim of this work was to use spectroscopic methods and partial least squares discriminant analysis (PLS-DA) for the early prediction of genotype resistance or susceptibility to sugarcane borer. The sugarcane leaf +1 was directly analyzed with no sample preparation by ultraviolet-visible-near-infrared (UV-VIS-NIR), middle-infrared (MID), and near...

A T1 (sugarcane population originating from true seeds) and T2 (first sugarcane clonal stage) population were used to estimate genetic parameters and compare selection strategies for Diatraea saccharalis (Lepidoptera: Crambidae) resistance in sugarcane. In the T1 stage, heritability at the family mean level (h²=0.77) was higher than individual geno...

New strategies of ordered predictors selection (OPS) were developed in this work, making this method more versatile and expanding its worldwide use and applicability. OPS is a recognized method to select variables in multivariate regression and is used by analytical chemists and chemometrists. It shows high ability to improve the prediction of mode...

ABSTRACT The sugarcane spittlebug, Mahanarva fimbriolata (Walker) (Hemiptera: Cercopidae) is an economically important pest of sugarcane in Brazil. The purpose of this study was to develop and validate a greenhouse methodology to screen large sugarcane populations for resistance to spittlebug Mahanarva fimbriolata. A resistant and a susceptible gen...

Vigorous Eucalyptus plantations produce 105 to 106 km ha-1 of fine roots that probably increase carbon (C) and nitrogen (N) cycling in rhizosphere soil. However, the quantitative importance of rhizosphere priming is still unknown for most ecosystems, including these plantations. Therefore, the objective of this work was to propose and evaluate a me...

O objetivo deste trabalho foi avaliar duas importantes metodologias estatísticas destinadas a avaliar perfis de expressão gênica em condições biológicas distintas (DESeq e baySeq) com a finalidade de verificar a influência do número de repetições na identificação de genes diferencialmente expressos (GDE); assim como avaliou a sobreposição dos GDE e...

In this study, we investigated resistance traits to the sugarcane borer Diatraea saccharalis Fab. (Lepidoptera: Crambidae) in the leaves and stalks of six sugarcane cultivars in a series of greenhouse and laboratory assays. Investigation of plant factors and infestation rates to better discriminate stalk damage by the sugarcane borer indicated that...

One of the major challenges in sugarcane breeding programs is an efficient selection of genotypes in the initial phase. The purpose of this study was to compare modelling by artificial neural networks (ANN) and linear discriminant analysis (LDA) as alternatives for the selection of promising sugarcane families based on the indirect traits number of...

The objective of this study was to select a population of sugarcane clones to develop energy cane cultivars. The genotypic means of 124 clones were estimated for the yield-related traits: mean number of stalks per plant (NS), mean stalk weight (MSW), fiber content (FIB), lignin content (LIG), and sucrose content in cane juice (SPC). From these data...

The purpose of this study was to investigate and compare root morpho-anatomical traits and physiological responses of susceptible (SP81-3250) and resistant (H. Kawandang) sugarcane genotypes exposed to the attack by nymphs of spittlebug Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae). Two experiments were conducted to compare the damage caused...

The aim of this study was to compare the effect of spittlebug Mahanarva fimbriolata Stål (Hemiptera: Cercopidae) on photosynthetic parameters of both a susceptible (SP81-3250) and a resistant (H.Kawandang) sugarcane genotype. In the first assay, the susceptibility level of genotypes to spittlebug was confirmed by comparing damage score and chloroph...

Vigorous Eucalyptus plantations produce 105 to 106 km ha−1 of fine roots that probably increase carbon (C) and nitrogen (N) cycling in rhizosphere soil. However, the quantitative importance of rhizosphere priming is still unknown for most ecosystems, for instance, Eucalyptus plantations. Therefore, the objective of this work was to propose and eval...

Understanding how host-crop genotypes affect the life history of insect pests is important for developing and using varietal resistance as a pest control measure. Here we determined how wild and cultivated sugarcane genotypes affect key life-history traits and the demographic performance of the root spittlebug, Mahanarva fimbriolata (Stål; Hemipter...

ABSTRACT The sugarcane borer Diatraea saccharalis Fabr. (Lepidoptera: Crambidae) is one of the most important pests of sugarcane in the Americas. The purpose of this study was to assess multiple resistance traits in eight sugarcane genotypes against D. saccharalis, including five commercial cultivars and three exotic germplasm with potential to ser...

Core Ideas The results presented the possibility of selection of energy cane clones. Develop energy cane clones with high fiber contents, involving Saccharum spontaneum accesses. We found clones with high fiber content and high sucrose levels. Sugarcane ( Saccharum spp.) is a crop with a high potential for biomass production. Sugarcane residue and...

The objective of this study was to identify superior parents for crosses and the best families to breed new clones of energy cane. The best-performing parents were RB867515, RB93509, KRAKATAU, IM76-228, IM76-229, and US85-1008. The heritability (0.59 – 0.85)and accuracy values (0.76 – 0.92) for the traits tons of cane per hectare, fiber, and sucros...

Here, we present the chloroplast genome sequence of the Saccharum hybrid cultivar RB867515, the most planted sugarcane cultivar in Brazil.

The aim of this study was to evaluate the importance of agronomic traits during the selection of sugarcane (Saccharum spp.), as well as to evaluate the potential for using logistic regression and decision trees to identify the best genotypes. A total of 7,719 seedlings of 128 half-sib families were evaluated during the first test phase (T1), and 65...

The purpose of this study was to compare the method BLUPIS (best linear unbiased prediction individual simulated) with mass selection in terms of efficiency in identifying the best genotypes in sugarcane (Saccharum officinarum L.) families. Mass selection was performed by two breeders with 25 yr of experience. The BLUPIS procedure selected families...

The objective of this work was to evaluate the efficiency of spatial statistical analysis, compared to the usual analyzes in randomized blocks and in lattice, for the classification of common bean (Phaseolus vulgaris) families under different scenarios of spatial dependence and experimental precision. Twelve scenarios were considered, formed by fou...

The objective of this study was to assess the efficiency of a modification of the simulated individual best linear unbiased prediction (BLUPIS) procedure, which is used for the approximation of classic individuals (BLUPI) for selection between and within sugarcane families. A total of 110 full-sib families were employed in an experiment initiated i...

Porcine blood may be used in meat processing as source of protein for human consumption. This study aimed to analyze the chemical composition and protein quality (chemical score, protein digestibility-corrected amino acid score, digestibility, and protein efficiency) of mortadellas formulated by replacing different levels (0, 5, 10, 15 and 20%) of...

The aim of this study was to identify the traits that most affect production of sugarcane, fiber and lignin content (LIG) with a view toward optimizing the process of assessment and selection of families of energy cane. Fifty full-sibs families were assessed using an incomplete-block design, with five replications. The traits assessed were mean sta...

The objective of this study was to evaluate Artificial Neural Networks (ANN) applied in an selection process within sugarcane families. The best ANN model produced no mistake, but was able to classify all genotypes correctly, i.e., the network made the same selective choice as the breeder during the simulation individual best linear unbiased predic...

The aim of this study was to evaluate the genetic diversity and coefficient of kinship in 50 sugarcane genotypes, in addition to identifying potential parents for obtaining cultivars of energy cane. Diversity analysis was carried out based on the evaluation of morphological and agronomical characteristics. The coefficient of kinship was obtained fr...

The aim of this study was to assess the efficiency of the simulated individual BLUP (BLUPIS) method in selecting genotypes within full-sib families of sugarcane in ratoon stage, through comparison with selection using the individual BLUP method. The optimal number of genotypes to be selected in the best families were established for mean stems mass...

This chapter deals with the statistical analysis of genomic, transcriptomic and proteomic data. Emphasis is given to the analysis of gene expression data including hints on experimental designs to sound data generation. Epigenetic variation is also addressed as a mean to enhance the analyses.

The increase in popularity of high-throughput genotyping in breeding programs is associated with recent advances in DNA sequencing technology and large decreases in genotyping costs. However, the limits of using genotyping for making predictions and, therefore, identifying potential candidate materials for selection thus reside in the quality of th...

During the evaluation of the experimental phase, which corresponds to competition experiments and indication of cultivars, is recommended total harvest of plots, which, owing to their costs, can become impracticable. Optionally, one can estimate the production based on taking samples representing plots. The aim of this study was to research the sam...

The success of the development of new sugarcane varieties is associated with the ability to correctly select the genitor. The aim of this study was to evaluate the genetic diversity between 113 clones and sugarcane varieties using the Ward-modified location model procedure with added information about the coefficient of parentage and endogamy. In t...

Superior inbred clones selected in S1 families can integrate an individual reciprocal recurrent selection program in sugarcane by eliminating the genetic load of the population and exploring superior hybrid combinations. Molecular markers can be used for reliable identification of the true selfing-derived clones in these S1 populations. The objecti...

During the evaluation of the experimental phase, which corresponds to competition experiments and indication of cultivars, is recommended total harvest of plots, which, owing to their costs, can become impracticable. Optionally, one can estimate the production based on taking samples representing plots. The aim of this study was to research the sam...

Sugarcane (Saccharum spp.) bagasse is recognized as a promising feedstock for cellulosic ethanol production. The development of high-quality crop cultivars through plant breeding is a way to improve feedstock quality. This study aimed to directly and indirectly quantify the effects of agronomic characteristics on the saccharification of sugarcane b...

The cost associated with descriptive sensory tests can be derived primarily from two sources: (i) execution time of the test and (ii) the number of judges participating. The Optimized Descriptive Profile (ODP) technique is a new methodology that proposes to reduce test time through an optimized sensory evaluation protocol. The objective of this stu...

In Brazil, the first genetically modified (GM) crop was released in 1998, and it is estimated that 84, 78, and 50% of crop areas containing soybean, corn, and cotton, respectively, were transgenic in 2012. This intense and rapid adoption rate confirms that the choice to use technology has been the main factor in developing national agriculture. Thu...

Recently molecular markers covering the whole genome have been successfully used for prediction of genetic merit of selection candidates, the so-called genomic selection. However, genotyping many individuals with high-density SNP marker panels may not be feasible in most commercial breeding programs. In these circumstances an alternative is the sel...

Sugarcane (Saccharum spp. interspecific hybrids) cultivars are a polyploidy and heterozygous complex of genotypes with a large amount of genotypic variability. This study evaluated several commercial traits from a series of trials to provide a better understanding of the genetic structure of this population with the aim of identifying future breedi...

The froghopper Mahanarva indentata (Walker) (Hemiptera: Cercopidae) is an economically important pest of sugarcane in Brazil. With the purpose of complementing various biological studies of the froghopper species associated with sugarcane, this research was developed to describe the morphology, and development of the eggs, nymphs and adults of M. i...

We evaluated the genetic diversity of 77 clones of sugarcane used in crosses made by the Brazilian interuniversity network for the development of the sugar/energy sector (RIDESA) breeding program. Characterization of the genotypes was carried out at the ratoon stage, based on eight morphological traits and seven agronomic traits. Diversity analysis...