MANIPULATION OF GRAIN DORMANCY IN WHEAT
MANIPULATION OF GRAIN DORMANCY IN WHEAT
复制标题
DOI：
10.1093/jxb/44.6.1059
复制
发表时间：
1993-06-01
影响因子：
6.9
通讯作者：
KING, RW
中科院分区：
文献类型：
--
作者：
KING, RW
为了帮助理解小麦休眠的机制，将完整的穗短暂干燥作为一种快速施加休眠的技术进行了研究。在开花后40天（dpa）的自然谷物干燥之前，将整个植物移至“湿润”、潮湿条件（90- 100%RH）或“干燥”条件（35- 40%RH）15 - 20天。随后休眠的持续时间至少增加了一倍的“干”处理，但是，只有当谷物被允许干燥前50 dpa。在“湿”穗有一个低水平（高达22%）的穗发芽55 dpa和剩余的，非发芽的谷物不再成为休眠干燥。短暂（4 d）的干燥事件也可以防止发芽，并诱导一定的休眠，但只有超过4至10 d的敏感窗口前50 dpa。谷物在适当的时间干燥不仅阻止了发育，而且可能通过干燥的破坏性影响引起休眠。休眠的施加与胚脱落酸（阿坝）或蔗糖含量无关。
To help in understanding the mechanisms of dormancy in wheat (Triticum aestivum L.), brief drying of intact ears has been examined as a technique for rapid imposition of dormancy. Before natural grain desiccation at 40 d post anthesis (dpa), whole plants were moved for 15 to 20 d to 'wet', humid conditions (90-100% RH) or to 'dry' conditions (35-40% RH). The duration of subsequent dormancy was at least doubled by the 'dry' treatment, however, only if the grain was allowed to dry before 50 dpa. In the 'wet' ears there was a low level (up to 22%) in-ear germination by 55 dpa and the remaining, non-sprouted grain no longer became dormant on drying. Brief (4 d) drying episodes could also prevent sprouting and induce some dormancy, but only over a 4 to 10 d window of sensitivity before 50 dpa. Grain drying when properly timed not only arrests development but, perhaps through damaging effects of drying, causes dormancy. Dormancy imposition was not related to embryo abscisic acid (ABA) or sucrose content.