Variation in the development of secondary dormancy in oilseed rape genotypes under conditions of stress
Variation in the development of secondary dormancy in oilseed rape genotypes under conditions of stress
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DOI：
10.1046/j.1365-3180.2002.00308.x
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发表时间：
2002-12
期刊：
影响因子：
1.7
通讯作者：
E. Momoh;W J Zhou;B. Kristiansson
中科院分区：
文献类型：
--
作者：
E. Momoh;W J Zhou;B. Kristiansson
在油菜收获之前和收获期间，大量的种子留在田地里。虽然这种作物表现出很少或根本没有初级休眠，但缺乏某些促进吸胀种子萌发的环境因素会诱导次级休眠。本研究调查了渗透胁迫、低氧胁迫和厌氧等环境胁迫条件在多大程度上诱导油菜次生休眠，并研究了油菜基因型之间和基因型内部次生休眠发展的差异。渗透胁迫诱导休眠的效果最好。厌氧处理产生很少的休眠种子，在低氧高氮的气氛中也是如此。渗透胁迫下次生休眠的发育在基因型间和基因型内差异很大。休眠范围从几乎为零到约60%的冬季基因型和约85%的春季类型。在基因型内，种子批次和收获年份之间发生变化。温度变化影响休眠种子的百分比。在20 °C水分胁迫条件下比在12 °C条件下可能产生更多的休眠种子。在冬季基因型中，当培养温度和发芽试验温度不同时，产生的休眠种子较少。因此，在20 °C和12 °C下孵育，然后分别在20 °C和12 °C下进行发芽试验，产生了大多数休眠种子。此外，在冬季基因型，潜在的二次休眠的发展与未处理的种子发芽的模式和速度呈正相关。
Summary A substantial amount of seed is left in the fields before and during harvest of oilseed rape. Although this crop exhibits little or no primary dormancy, the absence of certain environmental cues that promote germination of imbibed seeds induces secondary dormancy. The work reported investigated the extent to which environmental stress conditions, including osmotic stress, low oxygen stress and anaerobiosis, induce secondary dormancy in oilseed rape, and examined the variation in development of secondary dormancy between and within genotypes. Osmotic stress was most effective in inducing dormancy. Anaerobic treatment produced very few dormant seeds, as did an atmosphere low in oxygen and high in nitrogen. The development of secondary dormancy under osmotic stress varied considerably between and within genotypes. Dormancy ranged from almost zero to about 60% for winter genotypes and about 85% for spring types. Within genotypes, variations occurred between seed lots and years of harvest. Temperature variations affected the percentage of dormant seeds. More dormant seeds were likely to be produced with incubation under water stress at 20 °C than at 12 °C. In winter genotypes, fewer dormant seeds were produced when incubation temperature and germination test temperatures differed. Thus, incubating at 20 °C and 12 °C, followed by germination tests at 20 °C and 12 °C, respectively, produced most dormant seeds. Also, in the winter genotypes, the potential development of secondary dormancy was positively correlated with the pattern and speed of germination of untreated seeds.