Priming of field-sown rice seed enhances germination, seedling establishment, allometry and yield
Priming of field-sown rice seed enhances germination, seedling establishment, allometry and yield
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DOI：
10.1007/s10725-006-9138-y
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发表时间：
2006-07-01
影响因子：
4.2
通讯作者：
Wahid, Abdul
中科院分区：
文献类型：
--
作者：
Farooq, Muhammad;Barsa, Shahzad M. A.;Wahid, Abdul
秧苗定植是采用水稻直播的主要障碍。种子引发以获得更好的作物林分可能是一种有吸引力的方法。本研究的目的是确定种子引发策略对直播水稻农艺性状改良的有效性。种子引发策略为：水引发48 h，KCl或CaCl 2浸种硬化24 h，抗坏血酸引发48 h和种子硬化24 h，预发芽（传统的用于育苗的浸泡）和未处理的对照。种子引发提高发芽和出苗，异速生长，籽粒产量，其质量，而预发芽表现不佳和不稳定的出苗，其次是植物性能差。更快、更均匀的发芽是由于α-淀粉酶活性的提高，从而增加了引发籽粒中可溶性糖的水平。渗透硬化与氯化钾得到更大的仁和秸秆产量和收获指数，其次是氯化钙，硬化和抗坏血酸引发。产量的提高主要归因于有效分蘖数和千粒重。平均出苗时间与抽穗天数呈正相关，而籽粒产量与收获指数呈负相关，表明种子引发对植物生长发育有长期影响。结果表明，由灌浆硬化产生的生理变化增强了淀粉水解，使更多的糖可用于胚生长，旺盛的幼苗生产，后来，提高异速生长，籽粒产量和品质属性。
seedling establishment is a major deterrent in adopting direct seeding of rice. Seed priming to obtain better crop stand could be an attractive approach. The objective of this study was to determine the effectiveness of seed priming strategies on the improved agronomic characters of direct-sown rice. Seed priming strategies were: hydropriming for 48 h, osmohardening with KCl or CaCl2 for 24 h, ascorbate priming for 48 h and seed hardening for 24 h, pre-germination (traditional soaking for nursery raising) and untreated control. Seed priming improved germination and emergence, allometry, kernel yield, and its quality, whilst pre-germination displayed poor and erratic emergence of seedling followed by poor plant performance. Faster and uniform emergence was due to improved alpha-amylase activity, which increased the level of soluble sugars in the primed kernels. Osmohardening with KCl gave greater kernel and straw yield and harvest index, followed by that of CaCl2, hardening and ascorbate priming. Improved yield was attributed principally to number of fertile tillers and 1000 kernel weight. A positive correlation between mean emergence time and days to heading, while a negative one between kernel yield and harvest index suggested long-term effects of seed priming on plant growth and development. The results suggest that physiological changes produced by osmohardening enhanced the starch hydrolysis and made more sugars available for embryo growth, vigorous seedling production and, later on, improved allometric, kernel yield and quality attributes.