Heat tolerance in groundnut
Heat tolerance in groundnut
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DOI：
10.1016/s0378-4290(02)00155-7
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发表时间：
2003-01-08
影响因子：
5.8
通讯作者：
Nigam, SN
中科院分区：
文献类型：
--
作者：
Craufurd, PQ;Prasad, PVV;Nigam, SN
花生生殖生长期对高温和高温的耐受性是花生适应半干旱和半干旱种植环境的重要组成部分。在控制环境中筛选了10至22个基因型对高空气和土壤温度的耐受性。为了评估对高土壤温度的耐受性，在环境温度（28 ° C）和高土壤温度（38 ° C）下从结荚开始到收获生长10个基因型，并测量作物生长速率（CGR）、豆荚生长速率（PGR）和分配（PGR：CGR比率）。为了评估在两个关键阶段-小孢子发生（开花前3-6天，DBF）和开花期间对高空气温度的耐受性，在两个实验中测量坐果。在第一个实验中，12个基因型暴露于短（3-6天）事件的高（38 degreesC）日间气温在6 DBF和开花。在第二个试验中，22个基因型在6DBF、3DBF或开花时暴露于40 ℃的气温下1d。细胞膜热稳定性（相对损伤，RI）也在这22个基因型进行了测量。有相当大的变化基因型之间的反应，高温，无论是评估的增长速度，坐果或RI。在高土壤温度下的荚重与CGR的变化，而不是分配。开花比小孢子发生对高温更敏感。在小孢子发生期耐高温的基因型在开花期不一定耐高温，耐高温与RI也不相关。基于它们在所有测试中的表现，六种基因型（796、55-437、ICG 1236、ICGV 86021、ICGV 87281和ICGV 92121）被鉴定为耐热的。这些实验表明，花生基因型可以很容易地筛选出对高空气和土壤温度的生殖耐受性，花生种质中有几种耐热性来源。(C)2003 Elsevier Science B. V.保留所有权利。
Tolerance to high soil and air temperature during the reproductive phase is an important component of adaptation to and and semi-arid cropping environments in groundnut. Between 10 and 22 genotypes were screened for tolerance to high air and soil temperature in controlled environments. To assess tolerance to high soil temperature, 10 genotypes were grown from start of podding to harvest at ambient (28 degrees) and high (38 degreesC) soil temperatures, and crop growth rate (CGR), pod growth rate (PGR) and partitioning (ratio PGR:CGR) measured. To assess tolerance to high air temperature during two key stages-microsporogenesis (3-6 days before flowering, DBF) and flowering, fruit-set was measured in two experiments. In the first experiment, 12 genotypes were exposed to short (3-6 days) episodes of high (38 degreesC) day air temperature at 6 DBF and at flowering. In the second experiment, 22 genotypes were exposed to 40 degreesC day air temperature for I day at 6 DBF, 3 DBF or at flowering. Cellular membrane thermostability (relative injury, RI) was also measured in these 22 genotypes. There was considerable variation among genotypes in response to high temperature, whether assessed by growth rates, fruit-set or RI. Pod weight at high soil temperature was associated with variation in CGR rather than partitioning. Flowering was more sensitive to high air temperature than microsporogenesis. Genotypes tolerant to high air temperature at microsporogenesis were not necessarily tolerant at flowering, and nor was tolerance correlated with RI. Six genotypes (796, 55-437, ICG 1236, ICGV 86021, lCGV 87281 and ICGV 92121) were identified as heat tolerant based on their performance in all tests. These experiments have shown that groundnut genotypes can be easily screened for reproductive tolerance to high air and soil temperature and that several sources of heat tolerance are available in groundnut germplasm. (C) 2003 Elsevier Science B.V. All rights reserved.