G.H.M. Sagor

G.H.M. Sagor
Bangladesh Agricultural University | BAU · Department of Genetics and Plant Breeding

PhD

About

40
Publications
6,808
Reads
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600
Citations
Introduction
Molecular and Biochemical Characterization of different crop plants in response to abiotic and biotic stresses; Role of Polyamine during stress condition using model plant Arabidopsis thaliana and Nicotiana benthamiana.
Additional affiliations
March 2018 - present
Bangladesh Agricultural University
Position
  • Professor
April 2017 - June 2017
Senckenberg Biodiversität und Klima - Forschungszentrum
Position
  • PostDoc Position
May 2014 - May 2016
Tohoku University
Position
  • PostDoc Position

Publications

Publications (40)
Article
Tomato (Lycopersicum esculentum), is an important nutrition rich vegetable crops generally displays sensitivity to different levels of salinity. In this work, twenty-one tomato accessions were hydroponically tested under controlled environmental condition for salt tolerance using 0, 8 and 12 dS/m salinity at seedling stage. All the plants were died...
Article
Three advanced lines (SB02, SB05, SB07) along with one tolerant (Lokon) and one susceptible check (Asswt) of soybean (Glycine max L.) were assessed for salt tolerance in terms of morpho-physiological traits and molecular markers (SSR). The experiment was conducted at seedling stage with four salinity treatments namely 0, 8, 12 and 16 dSm-1 followin...
Article
Full-text available
Brassica napus L is an important oilseed crops grown throughout many parts of the world. It is well adapted to long day photoperiods. Synthetic B. napus was produced through interspecific hybridization between B. rapa L. var Tori-7 and exotic variety of B. oleracea L. var. alboglabra Bailey. The chromosomes of the interspecific hybrids were doubled...
Article
Full-text available
Agarwood is the resinous heartwood obtained from the injured parts of trees under Thymelaeaceae family particularly from Aquilaria species. Agarwood is considered as the most prized non-timber forest product (NTFP) used in attars as well as medicines. Quality of agarwood is the determiner for defining its commercial value. Different countries use d...
Article
Full-text available
Polyamine levels are controlled by biosynthesis, intra- and inter-cellular flux by the respective transporters, and catabolism. The catabolism is catalyzed by two groups of enzymes. One is copper-containing amine oxidases and the other is polyamine oxidases (PAOs). In Oryza sativa, seven PAO genes exist and they are termed as OsPAO1 to OsPAO7. Howe...
Article
Full-text available
Arabidopsis thaliana polyamine oxidase 5 gene (AtPAO5) functions as a thermospermine (T-Spm) oxidase. Aerial growth of its knock-out mutant (Atpao5-2) was significantly repressed by low dose(s) of T-Spm but not by other polyamines. To figure out the underlying mechanism, massive analysis of 3′-cDNA ends was performed. Low dose of T-Spm treatment mo...
Article
Full-text available
In breeding programs, direct selection based on yield is very difficult due its polygenic nature. Therefore, breeders need to consider association of numerous yield related attributes with yield and among themselves. In this study, 43 rice genotypes including some released varieties and advanced lines were evaluated based on morpho-genetic param...
Article
Full-text available
Osmotic stress is a kind of stress which is directly or indirectly related to all other abiotic stresses. Four rice varieties namely Binadhan-11 (with SUB1 gene), BRRI dhan52 (with SUB1 gene), Binadhan-7 and BRRI dhan71 were used to study the variation in root development and anti-oxidative response under osmotic stress conditions. Osmotic stress w...
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Rice (Oryza sativa) is a major cereal crop that contributes significantly to global food security. Here, the aim of this study was to create scientific information on nature and magnitude of genetic variability and inter-relationship among yield and related agro-morphological attributes and also to explore the pattern of diversity among some local...
Article
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Ten wheat genotypes of locally cultivated and exotic origins were grown under drought condition to determine the biochemical responses. Plants were grown in hydroponics in modified Hoagland solution in box container in the Growth Room with temperature, light and humidity control at the Plant Stress Breeding Laboratory (PSBL), at the dept. of Geneti...
Article
Full-text available
Polyamines are aliphatic polycations ubiquitously found in plants, involved in growth, development and many other physiological processes. Polyamine oxidases are monomeric proteins of about 55 kDa that bear a non-covalently bound molecule of FAD as a cofactor which are responsible for polyamines catabolism. They play very crucial role in polyamine...
Article
Full-text available
Rice (Oryza sativa) contributes significantly to global food security and is a major food crop for almost half of the world’s population. Fourty seven local rice germplasm were collected and grown under normal field condition to evaluate the presence of genetic diversity among them. Analysis of variance (ANOVA) showed significant differences (P ≤ 0...
Article
Full-text available
Global food security is seriously threatened due to increased frequency and occurrence of fungal diseases. One example is wheat blast caused by Magnaporthe oryzae is a fungal diseases of rice, wheat, and other grasses, that can destroy the whole food production to sustain millions of people. Wheat blast was first detected in february 2016 with a se...
Article
Full-text available
The experiment was conducted to evaluate the performances of fifteen resynthesized Brassica napus L. lines along with one check variety (Binasarisha-4) based on some morphological, yield and yield attributes and also to estimate association among the traits. Randomized Completely Block Design (RCBD) with three replications was used for this experim...
Article
Full-text available
The present study was conducted following randomized complete block design with three replications to evaluate the genetic variability of twenty five tomato genotypes for yield and nutritional traits and also their attributing factors. A wide range of variation was observed among the characters studied which have a great interest for tomato breeder...
Article
Full-text available
Of the five polyamine oxidases in Arabidopsis thaliana, AtPAO5 has a substrate preference for the tetraamine thermospermine (T-Spm) which is converted to triamine spermidine (Spd) in a back-conversion reaction in vitro. A homologue of AtPAO5 from the lycophyte Selaginella lepidophylla (SelPAO5) back-converts T-Spm to the uncommon polyamine norsperm...
Article
Full-text available
p>Polyamines (PA) are small organic polycations found in all living organisms. Putrescine (Put), spermidine (Spd), spermine (Spm) and thermospermine (T-Spm) are the most abundant PAs in plants. Of the polyamines (PAs) plant contains at least two types of tetraamines; spermine (Spm) and thermospermine (T-Spm) and they seem to have different function...
Article
Background and aims: Polyamines are small metabolites present in all living cells and play fundamental roles in numerous physiological events in plants. The aminopropyltransferases (APTs), spermidine synthase (SPDS), spermine synthase (SPMS) and thermospermine synthase (ACL5), are essential enzymes in the polyamine biosynthesis pathway. In angiosp...
Chapter
Polyamines play important roles in growth, development, and adaptive responses to various stresses. In the past two decades, progress in plant polyamine research has accelerated, and the key molecules and components involved in many biological events have been identified. Recently, polyamine sensors used to detect polyamine-enriched foods and polya...
Chapter
Plant mutants in polyamine pathway genes are ideal for investigating their roles in stress responses. Here we describe easy-to-perform methods for phenotyping Arabidopsis mutants under abiotic stress. These include measurements of root growth, chlorophyll content, water loss, electrolyte leakage, and content of the reactive oxygen species hydrogen...
Article
Polyamines (PA) in plant play roles in growth and development and in responses to environmental stresses. The family of polyamine oxidases (PAO) contributes to a balanced homeostasis of PAs catalyzing two different reactions, terminal catabolic (TC) and back-conversion (BC) pathway, in PA catabolism. From the seven PAOs encoded by the rice genome (...
Article
Full-text available
Key message: Two genes, LAT1 and OCT1 , are likely to be involved in polyamine transport in Arabidopsis. Endogenous spermine levels modulate their expression and determine the sensitivity to cadaverine. Arabidopsis spermine (Spm) synthase (SPMS) gene-deficient mutant was previously shown to be rather resistant to the diamine cadaverine (Cad). Furt...
Article
Full-text available
The link between polyamine oxidases (PAOs), which function in polyamine catabolism, and stress responses remains elusive. Here, we address this issue using Arabidopsis pao mutants in which the expression of the five PAO genes is knocked-out or knocked-down. As the five single pao mutants and wild type (WT) showed similar response to salt stress, we...
Chapter
Full-text available
Polyamines (PAs) are ubiquitous biogenic amines that have been implicated in diverse cellular functions in all organisms. Recent work has demonstrated that mainly the three prominent PAs in plants, putrescine, spermidine, and spermine, have a role as part of the complex signaling networks activated in response to abiotic stresses and pathogen attac...
Article
Full-text available
Enhancement of sugar content and sweetness is desirable in some vegetables and in almost all fruits; however, biotechnological methods to increase sugar content are limited. Here, a completely novel methodological approach is presented that produces sweeter tomato fruits but does not have any negative effects on plant growth. Sucrose-induced repres...
Article
Full-text available
In Arabidopsis three basic region leucine zipper (bZIP) transcription factor genes, bZIP17, bZIP28, and bZIP60, play crucial roles in the unfolded protein response (UPR). Previously we found that bZIP60 is one of the spermine-induced genes. Consequently we further investigated the response of all the three bZIP genes to spermine. Expression of bZIP...
Article
In the phylogeny of plant polyamine oxidases (PAOs), clade III members from angiosperms, such as Arabidopsis thaliana PAO5 and Oryza sativa PAO1, prefer spermine and thermospermine as substrates and back-convert both of these substrates to spermidine in vitro. A clade III representative of lycophytes, SelPAO5 from Selaginella lepidophylla, also pre...
Article
Full-text available
Arabidopsis plants do not synthesize the polyamine cadaverine, a five carbon-chain diamine and structural analog of putrescine. Mutants defective in polyamine metabolic genes were exposed to exogenous cadaverine. Spermine-deficient spms mutant grew well while a T-DNA insertion mutant (pao4-1) of polyamine oxidase (PAO) 4 was severely inhibited in r...
Data
Schematic structure of AtPAO4 gene and the T-DNA insertion site in SALK_133599 line. A. The position of T-DNA insertion of pao4-1 (SALK_133599) is shown as a white rectangle. Box, exon; line, intron; white box, untranslated region; black box, coding region. B. Transcript levels of AtPAO4 in WT (Col-0) and pao4-1 plants. AtPAO4 transcripts were dete...
Data
The primers used for qRT-PCR analysis.
Article
Full-text available
Key message: Our work suggests that long chain polyamines and their derivatives are potential chemicals to control viral pathogens for crop production. Previously we showed that two tetraamines, spermine (Spm) and thermospermine (T-Spm), induce the expression of a subset of defense-related genes and repress proliferation of Cucumber mosaic virus (...
Article
Full-text available
It is known that the polyamine (PA) biosynthetic pathway is modulated at the transcriptional level during abiotic stresses. Here we studied the expression of PA biosynthetic pathway genes upon exposure to heat shock (HS) in Arabidopsis and showed that the spermine (Spm) synthase gene (SPMS) and S-adenosylmethionine decarboxylase 2 gene are induced...
Article
Full-text available
We previously proposed the defensive role of a signal pathway triggered by the polyamine spermine (Spm) in the reaction against avirulent viral pathogens in Nicotiana tabacum and Arabidopsis thaliana. In this study, we showed that thermospermine (T-Spm), an isomer of Spm, is also active in inducing the expression of the genes involved in the Spm-si...
Article
Full-text available
Abstract Of the polyamines (PAs), plants contain at least two kinds of tetraamines, spermine (Spm) and thermospermine (T-Spm). They seem to have different functions in plants because the stem growth defect shown by the loss-of-function mutant plant of ACL5 (encoding T-Spm synthase) was partially complemented by T-Spm but not by Spm in Arabidopsis t...
Article
Full-text available
The genome of Arabidopsis thaliana contains five genes (AtPAO1 to AtPAO5) encoding polyamine oxidase (PAO) which is an enzyme responsible for polyamine catabolism. To understand the individual roles of the five AtPAOs, here we characterized their tissue-specific and space-temporal expression. AtPAO1 seems to have a specific function in flower organ...
Article
Arabidopsis thaliana was thought to contain two spermine synthase genes, ACAULIS 5 (ACL5) and SPMS. Recent investigations, however, revealed that the ACL5 gene encodes thermospermine synthase. In this study, we have established a simple method to separate two isomers of tetraamine, spermine and thermospermine, in extracts from plant tissues of less...
Article
Full-text available
We have proposed that the polyamine spermine functions as a signaling molecule to evoke defense reactions/cell death in N-gene bearing Nicotiana tabacum infected with tobacco mosaic virus (TMV). In this work we examined whether this spermine-based signal transduction pathway is present in other plants such as Arabidopsis thaliana. For this purpose,...

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