scholarly journals Evaluation of bio-physiological and yield responses of stay green QTL introgression sorghum lines to post-flowering drought stress

2018 ◽  
Vol 26 (4) ◽  
pp. 447
Author(s):  
K. Ayalew ◽  
A. Adugna ◽  
M. Fetene ◽  
S. Sintayehu
Keyword(s):  
Drought Stress ◽  
Stay Green ◽  
Yield Responses ◽  
Qtl Introgression

Stay-green trait serves as yield stability attribute under combined heat and drought stress in wheat (Triticum aestivum L.)

2021 ◽  
Author(s):  
Rajeev Kumar ◽  
Harikrishna ◽  
Dipankar Barman ◽  
Om P. Ghimire ◽  
S. Gurumurthy ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Drought Stress ◽  
Triticum Aestivum L ◽  
Yield Stability ◽  
Stay Green

scholarly journals Physiological and Proteomic Signatures Reveal Mechanisms of Superior Drought Resilience in Pearl Millet Compared to Wheat

2021 ◽  
Vol 11 ◽  
Author(s):  
Arindam Ghatak ◽  
Palak Chaturvedi ◽  
Gert Bachmann ◽  
Luis Valledor ◽  
Živa Ramšak ◽  
...  
Keyword(s):  
Drought Stress ◽  
Pearl Millet ◽  
Stress Responses ◽  
Root Morphology ◽  
Large Scale ◽  
Foxtail Millet ◽  
Proteome Analysis ◽  
Specific Marker ◽  
Stay Green ◽  
Drought Tolerant

Presently, pearl millet and wheat are belonging to highly important cereal crops. Pearl millet, however, is an under-utilized crop, despite its superior resilience to drought and heat stress in contrast to wheat. To investigate this in more detail, we performed comparative physiological screening and large scale proteomics of drought stress responses in drought-tolerant and susceptible genotypes of pearl millet and wheat. These chosen genotypes are widely used in breeding and farming practices. The physiological responses demonstrated large differences in the regulation of root morphology and photosynthetic machinery, revealing a stay-green phenotype in pearl millet. Subsequent tissue-specific proteome analysis of leaves, roots and seeds led to the identification of 12,558 proteins in pearl millet and wheat under well-watered and stress conditions. To allow for this comparative proteome analysis and to provide a platform for future functional proteomics studies we performed a systematic phylogenetic analysis of all orthologues in pearl millet, wheat, foxtail millet, sorghum, barley, brachypodium, rice, maize, Arabidopsis, and soybean. In summary, we define (i) a stay-green proteome signature in the drought-tolerant pearl millet phenotype and (ii) differential senescence proteome signatures in contrasting wheat phenotypes not capable of coping with similar drought stress. These different responses have a significant effect on yield and grain filling processes reflected by the harvest index. Proteome signatures related to root morphology and seed yield demonstrated the unexpected intra- and interspecies-specific biochemical plasticity for stress adaptation for both pearl millet and wheat genotypes. These quantitative reference data provide tissue- and phenotype-specific marker proteins of stress defense mechanisms which are not predictable from the genome sequence itself and have potential value for marker-assisted breeding beyond genome assisted breeding.

Rooting traits of peanut genotypes with different yield responses to pre-flowering drought stress

2011 ◽  
Vol 120 (2) ◽  
pp. 262-270 ◽  
Author(s):  
N. Jongrungklang ◽  
B. Toomsan ◽  
N. Vorasoot ◽  
S. Jogloy ◽  
K.J. Boote ◽  
...  
Keyword(s):  
Drought Stress ◽  
Yield Responses

Quantitative trait loci mapping for traits related to the progression of wheat flag leaf senescence

2014 ◽  
Vol 153 (7) ◽  
pp. 1234-1245 ◽  
Author(s):  
S. WANG ◽  
Z. LIANG ◽  
D. SUN ◽  
F. DONG ◽  
W. CHEN ◽  
...  
Keyword(s):  
Drought Stress ◽  
Quantitative Trait Loci ◽  
Leaf Senescence ◽  
Quantitative Trait ◽  
Flag Leaf ◽  
Model Parameters ◽  
Stay Green ◽  
Trait Loci ◽  
Dh Lines ◽  
Additive Qtls

SUMMARYDelayed senescence, or stay-green, contributes to a longer grain-filling period and has been regarded as a desirable characteristic for the production of a number of crops including wheat. In the present study, in order to identify quantitative trait loci (QTLs) for traits related to the progression of wheat flag leaf senescence, green leaf area duration (GLAD) of a doubled haploid (DH) population, derived from two winter wheat varieties Hanxuan10 and Lumai14, was visually estimated under two water conditions and was recorded at 3-day intervals from 10 days after anthesis to physiological maturity using a 0–9 scale. According to GLAD, parameters related to the progression of senescence of DH lines and their parents were estimated by the Gompertz statistical model. Based on the model parameters, DH lines were categorized into three groups under drought stress and four groups under well-watered conditions. A total of 24 additive QTLs and 23 pairs of epistatic QTLs for parameters related to the progression of senescence were identified on 18 chromosomes, except for 3B, 1D and 6D. Of the QTLs detected, 14 and 10 additive QTLs were associated with the investigated traits under drought stress and well-watered conditions, respectively. Furthermore, 4, 7, 6, 2 and 2 additive QTLs for traits related to progression of senescence were clustered around the same or similar regions of chromosomes 1A, 1B, 5A, 5B and 7A, respectively. The present data provided the genetic basis for high phenotypic correlations among traits related to the progression of wheat flag leaf senescence. In addition, 17 loci were co-located or linked with previously reported QTLs regulating chlorophyll fluorescence, high-light-induced photo-oxidation, or heat stress and dark-induced senescence. The marker Xwmc336 on chromosome 1A, responsible for the onset and end times of leaf senescence, the time to maximum rate of senescence, the time to reach 75% senescence and chlorophyll content under drought stress may be helpful for marker-assisted selection breeding of wheat.

Molecular mapping of QTLs conferring stay-green in grain sorghum (Sorghum bicolor L. Moench)

Genome ◽  
2000 ◽  
Vol 43 (3) ◽  
pp. 461-469 ◽  
Author(s):  
Wenwei Xu ◽  
Prasanta K Subudhi ◽  
Oswald R Crasta ◽  
Darrell T Rosenow ◽  
John E Mullet ◽  
...  
Keyword(s):  
Drought Stress ◽  
Linkage Group ◽  
Restriction Fragment Length Polymorphism ◽  
Fragment Length Polymorphism ◽  
Phenotypic Variability ◽  
Linkage Groups ◽  
Stay Green ◽  
Group A ◽  
Sorghum Bicolor L ◽  
Restriction Fragment Length

Drought resistance is of enormous importance in crop production. The identification of genetic factors involved in plant response to drought stress provides a strong foundation for improving drought tolerance. Stay-green is a drought resistance trait in sorghum (Sorghum bicolor L. Moench) that gives plants resistance to premature senescence under severe soil moisture stress during the post-flowering stage. The objective of this study was to map quantitative trait loci (QTLs) that control the stay-green and chlorophyll content in sorghum. By using a restriction fragment length polymorphism (RFLP) map, developed from a recombinant inbred line (RIL) population, we identified four stay-green QTLs, located on three linkage groups. The QTLs (Stg1 and Stg2) are on linkage group A, with the other two, Stg3 and Stg4, on linkage groups D and J, respectively. Two stay-green QTLs, Stg1 and Stg2, explaining 13-20% and 20-30% of the phenotypic variability, respectively, were consistently identified in all trials at different locations in two years. Three QTLs for chlorophyll content (Chl1, Chl2, and Chl3), explaining 25-30% of the phenotypic variability were also identified under post-flowering drought stress. All coincided with the three stay-green QTL regions (Stg1, Stg2, andStg3) accounting for 46% of the phenotypic variation. The Stg1 and Stg2 regions also contain the genes for key photosynthetic enzymes, heat shock proteins, and an abscisic acid (ABA) responsive gene. Such spatial arrangement shows that linkage group A is important for drought- and heat-stress tolerance and yield production in sorghum. High-resolution mapping and cloning of the consistent stay-green QTLs may help to develop drought-resistant hybrids and to understand the mechanism of drought-induced senescence in plants.Key words: drought tolerance, genetic mapping, post-flowering stress, restriction fragment length polymorphism.

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