Cold acclimation threshold induction temperatures in cereals
Cold acclimation threshold induction temperatures in cereals
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DOI：
10.2135/cropsci2007.10.0581
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发表时间：
2008-05-01
期刊：
影响因子：
2.3
通讯作者：
Fowler, D. Brian
中科院分区：
文献类型：
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作者：
Fowler, D. Brian
为了获得竞争优势并确保在极端低温下的生存，冷季植物必须对有利于生长的温度和信号季节变化的环境线索做出反应。本项目旨在确定（i）小麦（Triticum aestivum L.）的冷驯化阈值诱导温度（ITs），大麦（Hordeum vulgare L.），和黑麦（Secale cereale L.）以及（ii）它们与植物在完全驯化下的抗冻性的关系。广泛的基因型特异性IT和初始快速驯化反应，呈负相关的温度低于阈值的下降，观察到内部和物种之间，表明谷物监测温度具有很高的精度。当春化基因在近等基因系中被中和时，哈代小麦品种的激活温度比嫩基因型高5.7摄氏度，而哈代黑麦与嫩大麦品种相比的IT差异为12摄氏度，这强调了黑麦的高冷适应潜力。这种对气温下降的早期反应意味着哈代黑麦有更长的时间为冬季的极端天气做准备，并且在生长季节能够更好地科普意外的霜冻。在完全驯化的IT的差异密切相关的抗冻性的差异。然而，较长的营养阶段也意味着冬季习性基因型更响应于在阈值范围内的驯化温度延长的时间。
To acquire a competitive advantage and ensure survival when exposed to low-temperature extremes, cool season plants must be programmed to respond to temperatures favorable for growth and environmental cues that signal seasonal changes. This project was initiated to determine (i) the cold acclimation threshold induction temperatures (ITs) in wheat (Triticum aestivum L.), barley (Hordeum vulgare L.), and rye (Secale cereale L.) and (ii) their relationship to plant freezing tolerance at full acclimation. A wide range of genotypic specific IT and initial rapid acclimation responses that were inversely related to decreases in temperatures below the threshold was observed both within and among species, indicating that cereals monitor temperature with a high level of precision. Hardy wheat cultivars had a 5.7 degrees C warmer activation temperature than tender genotypes when the vernalization gene was neutralized in near-isogenic lines, and a 12 degrees C difference in IT of hardy rye compared with tender barley cultivars emphasized the high cold adaptation potential of rye. This early response to decreasing temperatures means that hardy rye had a longer time to prepare for the extremes of winter and was in a better position to cope with unexpected frosts during the growing season. Differences in IT were closely related to the differences in freezing tolerance at full acclimation. However, a longer vegetative stage also meant that winter habit genotypes were more responsive to extended periods at acclimation temperatures in the threshold range.