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Introduction
Current institution
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March 2012 - June 2017
January 2010 - June 2010
April 2012 - present
Publications
Publications (50)
Crop improvement efforts aiming at increasing crop production (quantity, quality) and adapting to climate change have been subject of active research over the past years. But, the question remains ‘to what extent can breeding gains be achieved under a changing climate, at a pace sufficient to usefully contribute to climate adaptation, mitigation an...
This paper presents a high-throughput method for Above Ground Estimation of Biomass (AGBE) in rice using multispectral near-infrared (NIR) imagery captured at different scales of the crop. By developing an integrated aerial crop monitoring solution using an Unmanned Aerial Vehicle (UAV), our approach calculates 7 vegetation indices that are combine...
The upland rice (UR) crop system located in the Brazilian savannas (states of Mato Grosso, Rondônia, Tocantins and Goiás) is the main upland rice growing area of Brazil and the largest rainfed rice growing area in Latin America. It plays an important social and economic role in central Brazil. UR cropped area, however, has decreased by 70% in the l...
Soil drying causes leaf rolling in rice, but the relationship between leaf rolling and drought tolerance has historically confounded selection of drought‐tolerant genotypes. In this study on tropical japonica and aus diversity panels (170–220 genotypes), the degree of leaf rolling under drought was more affected by leaf morphology than by stomatal...
A diversity panel comprising of 296 indica rice genotypes was phenotyped under non-stress and water-deficit stress conditions during the reproductive stage in 2013 and 2014 dry seasons at IRRI, Philippines. We investigated the genotypic variability for grain yield, yield components and related traits and conducted genome-wide association studies (G...
La variabilidad climática se relaciona con una reducción de la radiación en
diferentes regiones productoras de arroz en todo el mundo; esto reducción causa
una disminución en el rendimiento, especialmente si ocurre durante la fase de
maduración. El objetivo de esta investigación fue identificar características
relacionadas con la tolerancia a la ba...
Rice is the most important food crop in the developing world. For rice production systems to address the challenges of increasing demand and climate change, potential and on-farm yield increases must be increased. Breeding is one of the main strategies toward such aim. Here, we hypothesise that climatic and atmospheric changes for the upland rice g...
We evaluated the yields of Oryza sativa L. ‘Nipponbare’ rice lines expressing a gene encoding an A20/AN1 domain stress-associated protein, AlSAP, from the halophyte grass Aeluropus littoralis under the control of different promoters. Three independent field trials were conducted, with drought imposed at the reproductive stage. In all trials, the tw...
With the aim to find new sources of resistance to rice hoja blanca (white leaf) disease, transmitted by the insect Tagosodes orizicolus, 660 genotypes were evaluated under greenhouse and field conditions. Seven resistant genotypes were identified, and genomic studies were performed to demonstrate that the resistance in these sources is genetically...
Number of spikelets per panicle (NSP) is a key trait to increase yield potential in rice (O. sativa). The architecture of the rice inflorescence which is mainly determined by the length and number of primary (PBL and PBN) and secondary (SBL and SBN) branches can influence NSP. Although several genes controlling panicle architecture and NSP in rice...
Seasonal and inter-annual climate variability have become important issues for farmers, and climate change has been shown to increase them. Simultaneously farmers and agricultural organizations are increasingly collecting observational data about in situ crop performance. Agriculture thus needs new tools to cope with changing environmental conditio...
Partial dependence plots of the relevant predictors in Saldaña.
(a)(b) Saldaña-F733 and (c)(d) Saldaña-F60
(TIF)
Weather stations used in Villavicencio.
(DOCX)
Histograms of the observed rice yield distributions in Saldaña (up) and Villavicencio (down).
(TIF)
Weather stations used in Saldaña.
NA stands for not available.
(DOCX)
Boxplots of the observed yields distributions in each cluster in Villavicencio.
Clusters are sorted from left to right in decreasing order median yield value. Lowercase letters above the boxplots show the results of the Kruskal-Wallis test, with statistically similar clusters grouped by the same letter.
(TIF)
Boxplots of the yield distributions by cultivar under cluster 4 for Villavicencio.
Cultivars are sorted from left to right in decreasing order of number of observations. Lowercase letters above the boxplots show the results of the Kruskal-Wallis test, with statistically similar cultivars grouped by the same letter.
(TIF)
Summary of the variability observed in each growth stage in each site.
See Table 2 in the manuscript for variables definitions
(DOCX)
Crop modeling in support of breeders’ decisions on selection criteria can benefit from the new global focus on phenomics because it provides new information on existing genetic diversity for useful traits. This study attempted an in silico prediction of margins for genetic improvements of early vigor (biomass produced during vegetative growth) and...
Early vigour of rice, defined as seedling capacity to accumulate shoot dry weight (SDW) rapidly, is a complex trait. It depends on a genotype propensity to assimilate, store, and/or use non-structural carbohydrates (NSC) for producing large and/or numerous leaves, involving physiological trade-offs in the expression of component traits and, possibl...
The ability to assimilate C and allocate non-structural carbohydrates (NSCs) to the most appropriate organs is crucial to maximize plant ecological or agronomic performance. Such C source and sink activities are differentially affected by environmental constraints. Under drought, plant growth is generally more sink than source limited as organ expa...
The ability to assimilate C and allocate non-structural carbohydrates (NSCs) to the most appropriate organs is crucial to maximize plant ecological or agronomic performance. Such C source and sink activities are differentially affected by environmental constraints. Under drought, plant growth is generally more sink than source limited as organ expa...
Selection for early vigour can improve rice (Oryza sativa L.) seedlings’ access to resources, weed competitiveness and yield. Little is known about the relationships between early vigour and drought tolerance. This study explored a panel of 176 rice genotypes in a controlled environment regarding a diversity of traits and trait combinations related...
Early vigour and drought tolerance are essential for rice (Oryza sativa L.) crop establishment and final yield in rainfed, vegetative drought prone environments. However, recently, a negative linkage between these complex traits was pointed out within the rice genetic diversity, making the seedling performance under drought dependent on complex, dy...
Early vigour is an important objective in rice breeding. A previous study reported strong positive effects of development rate (DR, 1/phyllochron) on early growth vigour in two rice panels. This study provided a model‐based analysis of DR effects on rice early vigour and underlying source–sink processes during exponential growth, using Ecomeristem...
Achieving early vigour, that is, rapid dry matter accumulation, is a priority in rice crop improvement, but this trait is complex and not well understood genetically and physiologically. This study tested the hypothesis that the development rate (DR) contributes to early vigour. Two diversity panels were phenotyped during vegetative stage for trait...
Background
Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L). Little is known on trade-offs with drought tolerance. This study explored the relevance of (sugar) metabolic and morphogenetic traits to describe the genetic diversity of rice early vigour and its phenotypic plasticity under drought condit...
The potential for tree components of coffee agroforestry systems to provide ecosystem services is widely recognized. Management practices are a key factor in the amount and quality of ecosystem services provided. There is relatively abundant information on ecosystem services provision within agroforestry systems, but comparatively scant information...
The extent to which coffee agroforestry systems provide ecosystem services depends on local context and management practices. There is a paucity of information about how and why farmers manage their plantations in the way that they do and the local knowledge that underpins this. This research compares knowledge from coffee-growing areas bordering k...
