Cold tolerance of soybean (Glycine max (L) Merr) during the reproductive phase
Cold tolerance of soybean (Glycine max (L) Merr) during the reproductive phase
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DOI：
10.1016/s1161-0301(96)02011-4
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发表时间：
1996-10-01
影响因子：
5.2
通讯作者：
Stamp, P
中科院分区：
文献类型：
--
作者：
Gass, T;Schori, A;Stamp, P
10个不确定的MG 00和MG 000大豆基因型的瑞士和北美的起源，代表不同水平的耐冷性，进行了研究，在3年内，共5个环境。结果表明，开花期间的耐冷性是基于三个独立和协同作用的性状，即：在中央总状花序上产生的花的数量;在冷胁迫下保留中央总状花序花的能力;以及通过在侧总状花序上快速和持续的花发育来补偿中央总状花序花损失的能力。在研究的材料中，这些性状中的每一个都存在大的基因型变异。特别令人感兴趣的是，耐受性和易感性基因型之间的阈值差异为3度，低于该阈值的温度可以被认为是有害的（分别为15和18摄氏度）。不同的补偿机制的相对重要性进行了讨论和脆弱性的基因型显示同步开花的中央和侧总状花序被证实。在收获时，大豆基因型对开花期间发生的低温的敏感性可以通过豆荚和种子沿茎沿着的不规则分布来区分。产量低或无节是胁迫诱导落花的结果。结果表明，狭义耐受，即，冷胁迫后花的脱落减少可以在成熟时通过对茎中部的中央总状花序上的荚座进行评级来评估。
Ten indeterminate MG00 and MG000 soybean genotypes of Swiss and North American origin, representing different levels of cold tolerance, were studied during 3 years in a total of five environments. The results showed that cold tolerance during flowering is based on three independent and synergistic traits, viz: number of flowers produced on central racemes; capacity to retain central raceme flowers despite cold stress; and capacity to compensate a loss of central raceme flowers by rapid and sustained flower development on lateral racemes. Within the material studied large genotypic variability exists for each of these traits. Particularly interesting is a 3 degrees difference between tolerant and susceptible genotypes in the threshold below which temperatures can be considered to be damaging (15 and 18 degrees C, respectively). The relative importance of different compensation mechanisms is discussed and the vulnerability of genotypes showing synchronous flowering of central and lateral racemes is confirmed. At harvest, susceptibility of soybean genotypes to low temperatures occurring during flowering can be distinguished by an irregular distribution of pods and seeds along the stem. Low yielding or barren nodes were the result of stress induced flower abscission. Results showed that narrow sense tolerance, i.e., reduced abscission of flowers following cold stress, can be assessed at maturity by rating pod set on central racemes of the median part of the stem.