Soil burial induced dormancy in weedy rice seeds through hormone level changes: Implications in adaptive evolution and weed control
Soil burial induced dormancy in weedy rice seeds through hormone level changes: Implications in adaptive evolution and weed control
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DOI：
10.1111/jse.12737
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发表时间：
2021-06-01
影响因子：
3.7
通讯作者：
Lu, Bao-Rong
中科院分区：
文献类型：
--
作者：
Jiang, Xiao-Qi;Zhu, Xin-Yu;Lu, Bao-Rong
种子休眠是防止高等植物种子在不利环境条件下随机萌发的关键。以往的研究表明，一个临界温度可以调节杂草稻种子的萌发，而不会使种子在散布时处于初级休眠状态。然而，当温度波动超过临界温度时，土壤种子库中的非休眠种子在破碎后会发生什么变化仍然是一个有趣的问题有待研究。为了确定土埋是否可以改变杂草稻种子的休眠状态，我们研究了土埋处理后杂草稻种子的发芽率。此外，我们比较了激素水平在未经处理的种子和可行的，但土埋后未发芽的种子。结果表明，土埋诱导了41%-72%的休眠种子。此外，种子休眠的诱导与土埋处理的种子中激素水平的变化有关，表明土埋可以显着激活种子中激素的产生控制。结合先前报道的临界温度抑制种子萌发的机制和新发现的土壤埋藏诱导种子休眠现象，为确保杂草稻种子在农业生态系统中的有利条件下萌发提供了“双安全”策略。研究结果不仅揭示了杂草，如杂草稻，在适应不断变化的农业环境中的适应功能的快速进化的重要作用，但也有利于有效的杂草稻控制措施的策略设计。
Seed dormancy plays a key role in preventing seeds of higher plants from random germination under adverse environmental conditions. Previous studies suggested that a critical temperature could regulate germination of weedy rice seeds without primary dormancy at seed dispersion. However, what will happen to the non-dormant seeds after shattering in the soil seed banks when temperature fluctuates to exceed the critical temperature remains an interesting question to be investigated. To determine whether or not soil burial can change the status of dormancy in weedy rice seeds, we examined germination ratios of weedy rice seeds after soil-burial treatments. In addition, we compared hormone levels in the untreated seeds and viable but ungerminated seeds after soil burial. Results showed that soil burial induced a proportion of 41%-72% dormant seeds in the initially non-dormant weedy rice seeds. Also, the induction of seed dormancy is associated with the change of hormone levels in the seeds treated by soil burial, suggesting that soil burial can significantly activate the control of hormone production in seeds. Together, the previously reported mechanism of critical temperature-inhibited seed germination and the newly found phenomenon of soil burial-induced seed dormancy provide a "double-security" strategy to ensure germination of weedy rice seeds under a favorable condition in agricultural ecosystems. The findings not only reveal the important role of rapid evolution of adaptive functions in weeds, such as weedy rice, in adapting to changing agricultural environments, but also facilitate the design of strategies for effective weedy rice control practices.