Vitality of primed rice seeds sown under prolonged dry soil conditions in an upland field
Vitality of primed rice seeds sown under prolonged dry soil conditions in an upland field
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在旱地长期干燥的土壤条件下播种的经过处理的水稻种子的活力
DOI：
10.1002/csc2.20736
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发表时间：
2022
期刊：
影响因子：
2.3
通讯作者：
Sakagami Jun‐Ichi
中科院分区：
文献类型：
--
作者：
Nakao Yoshihiro;Tamaru Shotaro;Yabuta Shin;Sakagami Jun‐Ichi
在雨养旱稻（Oryza sativa）种植过程中，不可预测的干旱事件会阻碍水稻的生长。尽管据报道种子引发处理具有耐旱性，但我们假设来自引发种子的植物会死亡，因为它们会开始在干燥的土壤中发芽。我们还预计未出苗的引发剂种子会表现出种子活力下降，因为它们的新陈代谢在播种前通过引发剂被激活。因此，我们研究了旱稻种植期间播种后长期干旱期间经过水底处理和未底处理的种子的活力。在雨养高地进行了一项田间试验，该旱田在季节开始时降雨量不足。还研究了重新播种的未发芽种子中的植物出苗、定植和活力。随后进行了生长室实验，以研究播种种子的恶化、土壤湿度和温度之间的关系。与假设相反，来自引发剂和对照种子的植物在出苗后可以在长期干旱下存活。在未发芽的引发剂种子中，氧化损伤增加。然而，重播种子中植物出苗的百分比在处理之间没有差异。总体而言，经过处理的种子的性能优于或类似于对照种子。总之，即使在雨养高地的极端干旱条件下，经过处理的种子也具有优势。
During rainfed upland rice (Oryza sativa) cultivation, unpredictable drought events can hinder the rice growth. Although drought tolerance is a reported effect of seed priming treatment, we hypothesized that plants from primed seeds would die because they would begin to emerge in dry soil. We also expected that nonemerged primed seeds would show decreased seed vigor because their metabolism was activated by priming before sowing. Therefore, we investigated the vigor of hydroprimed and nonprimed seeds during prolonged drought after sowing during upland rice cultivation. A field experiment was conducted on a rainfed upland field that had insufficient rainfall at the beginning of the season. Plant emergence, establishment, and vigor in resown nongerminated seeds were also investigated. A subsequent growth chamber experiment was conducted to investigate the relationship between sown seed deterioration, soil moisture, and temperature. Contrary to the hypothesis, plants from primed as well as control seeds could survive under prolonged drought after emergence. In the nongerminated primed seeds, oxidative damage was increased. However, the percentage of plant emergence in resown seeds did not differ between treatments. Overall, the performance of primed seeds was better than or similar to that of the control seeds. In conclusion, primed seeds have advantages even under extreme drought conditions in rainfed upland fields.