Heterosis and Genetic Parameters in Grain Sorghum under Irrigation and Drought Stress Environments = قوة الهجين و الثوابت الوراثية للمحصول و مكوناته في ذرة الحبوب الرفيعة تحت ظروف الري و الجفاف

Global warming and altered precipitation patterns pose a serious threat to crop production in the North China Plain (NCP). Quantifying the frequency of adverse climate events (e.g., frost, heat and drought) under future climates and assessing how those climatic extreme events would affect yield are important to effectively inform and make science-based adaptation options for agriculture in a changing climate. In this study, we evaluated the effects of heat and frost stress during sensitive phenological stages at four representative sites in the NCP using the APSIM-wheat model. climate data included historical and future climates, the latter being informed by projections from 22 Global Climate Models (GCMs) in the Coupled Model Inter-comparison Project phase 6 (CMIP6) for the period 2031–2060 (2050s). Our results show that current projections of future wheat yield potential in the North China Plain may be overestimated; after more accurately accounting for the effects of frost and heat stress in the model, yield projections for 2031-60 decreased from 31% to 9%. Clustering of common drought-stress seasonal patterns into key groups revealed that moderate drought stress environments are likely to be alleviated in the future, although the frequency of severe drought-stress environments would remain similar (25%) to that occurring under the current climate. We highlight the importance of mechanistically accounting for temperature stress on crop physiology, enabling more robust projections of crop yields under future the burgeoning climate crisis.

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Yield and biochemical properties of grain sorghum (Sorghum bicolor L. Moench) affected by nano-fertilizer under field drought stress

Cereal Research Communications ◽

10.1007/s42976-021-00198-2 ◽

2021 ◽

Author(s):

Elham Kazemi ◽

Hamid Reza Ganjali ◽

Ahmad Mehraban ◽

Ahmad Ghasemi

Keyword(s):

Drought Stress ◽

Sorghum Bicolor ◽

Grain Sorghum ◽

Biochemical Properties ◽

Sorghum Bicolor L

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Genetic Parameters and QTLs for Total Phenolic Content and Yield of Wheat Mapping Population of CSDH Lines under Drought Stress

International Journal of Molecular Sciences ◽

10.3390/ijms20236064 ◽

2019 ◽

Vol 20 (23) ◽

pp. 6064 ◽

Cited By ~ 1

Author(s):

Czyczyło-Mysza ◽

Cyganek ◽

Dziurka ◽

Quarrie ◽

Skrzypek ◽

...

Keyword(s):

Drought Stress ◽

Total Phenolic Content ◽

Genetic Parameters ◽

Phenolic Content ◽

Dry Weight ◽

Total Phenolic ◽

Doubled Haploid Population ◽

Severe Drought ◽

Gene Effects ◽

Significant Additive Effect

A doubled haploid population of 94 lines from the Chinese Spring × SQ1 wheat cross (CSDH) was used to evaluate additive and epistatic gene action effects on total phenolic content, grain yield of the main stem, grain number per plant, thousand grain weight, and dry weight per plant at harvest based on phenotypic and genotypic observations of CSDH lines. These traits were evaluated under moderate and severe drought stress and compared with well-watered plants. Plants were grown in pots in an open-sided greenhouse. Genetic parameters, such as additive and epistatic effects, affecting total phenolic content, were estimated for eight year-by-drought combinations. Twenty-one markers showed a significant additive effect on total phenolic content in all eight year-by-drought combinations. These markers were located on chromosomes: 1A, 1B, 2A, 2B, 2D, 3A, 3B, 3D, 4A, and 4D. A region on 4AL with a stable QTL controlling the phenolic content, confirmed by various statistical methods is particularly noteworthy. In all years and treatments, three markers significantly linked to QTLs have been identified for both phenols and yield. Thirteen markers were coincident with candidate genes. Our results indicated the importance of both additive and epistatic gene effects on total phenolic content in eight year-by-drought combinations.

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