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Interrelationships among different grain characteristics of wheat grown under optimum and late sowning date conditions in the Eastern Indo-Gangetic plains of India
Cereal Research Communications ( IF 1.6 ) Pub Date : 2021-01-02 , DOI: 10.1007/s42976-020-00123-z
Ranjan Kumar Chaubey , Dawa Dolma Bhutia , Sudhir Navathe , Vinod Kumar Mishra , Anil Kumar Singh , Ramesh Chand

Wheat growth has been severely affected by increases in global temperature. The Eastern Indo-Gangetic Plains of India face similar constraints due to the traditional wheat–rice cropping system where wheat planting is often delayed leading to high temperature induced terminal heat stress. Grain characters like grain length, width, area along with starch synthesis are affected severely during heat stress. Considering the importance of grain traits, we screened the response of 55 wheat genotypes under terminal heat stress conditions to ten grain characteristics. We found that the means of all the grain traits were reduced in heat stress conditions. The effect of heat stress shows a significantly reduced grain width and perimeter, but the extent of damage is less on different grain starch characteristics e.g., grain starch area (GSA), grain starch length (GSL) and grain starch volume (GSV). Stepwise multiple regression analysis revealed that grain starch area and grain volume are the best predictors of yield under optimum sowing date conditions whereas, grain width is the best predictor under late sowing date conditions. Interrelationship studies among ten grain characters showed that the genotypes with higher levels of grain starch characteristics (GSA, GSL and GSV) in combination with the five grain size characters (grain length, grain width, grain perimeter, grain area, A/B-type starch granules) under late sowing date conditions should be promoted for the cultivation of wheat in heat stress prone areas. The present study identified and recommends some heat tolerant wheat genotypes in terms of higher yield and grain starch characteristics namely, CRPW-33, CRPW-17, CRPW-12, CRPW-126 and CRPW-21.



中文翻译:

印度东部印度恒河平原在最佳播种和晚播日期条件下生长的小麦不同籽粒特性之间的相互关系

小麦生长受到全球气温升高的严重影响。由于传统的小麦-水稻种植系统,印度东部的印度-恒河平原面临类似的限制,在这种系统中,小麦的播种通常会延迟,从而导致高温引起的终极热应激。在热胁迫期间,诸如淀粉的长度,宽度,面积以及淀粉合成等谷物特性会受到严重影响。考虑到籽粒性状的重要性,我们筛选了55种小麦基因型在终极热应激条件下对十种籽粒性状的响应。我们发现,在热胁迫条件下,所有谷物性状的均值均降低。热应力的影响显示出明显减小的晶粒宽度和周长,但对不同谷物淀粉特性(例如谷物淀粉面积(GSA),谷物淀粉长度(GSL)和谷物淀粉体积(GSV)。逐步多元回归分析表明,在最佳播期条件下,籽粒淀粉面积和籽粒体积是产量的最佳预测指标,而在后期播种条件下,籽粒宽度是最佳预测指标。十个籽粒性状之间的相互关系研究表明,具有较高籽粒淀粉特性的基因型(GSA,GSL和GSV)结合五个籽粒大小特征(粒长,籽粒宽度,籽粒周长,籽粒面积,A / B型)应当在播种后期条件下推广淀粉颗粒),以便在热胁迫易发地区种植小麦。本研究从高产和籽粒淀粉特性方面鉴定并推荐了一些耐热小麦基因型,即CRPW-33,CRPW-17,CRPW-12,

更新日期:2021-01-03
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