MECHANISMS INVOLVED IN DELAYED GERMINATION OF QUERCUS-NIGRA L SEEDS
MECHANISMS INVOLVED IN DELAYED GERMINATION OF QUERCUS-NIGRA L SEEDS
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DOI：
10.1093/oxfordjournals.aob.a086555
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发表时间：
1983-01-01
期刊：
影响因子：
4.2
通讯作者：
PETERSON, JK
中科院分区：
文献类型：
--
作者：
PETERSON, JK
黑栎种子的果皮和种皮对水分的通过都没有明显的障碍。由于果皮的机械强度，果皮最终只能继续膨胀。在分层过程中，被困气体逸出，子叶继续膨胀，导致果皮膨胀。健壮的橡实需要105天左右的分层和发芽时间才能达到最大的发芽。这种可加性现象适用于4至10周的分层时间。延迟发芽的原因至少有3个：在13周的观察期内，果皮的机械强度是恒定的；果皮的化学抑制作用，经分层处理可减轻。4周;慢慢增加吸收果皮破裂所需水分的能力。在5 -30度的范围内，这个成分显然不依赖于温度。C，并在整个分层和萌发期间进行操作。
Neither the pericarp nor the seed coat impose significant barriers to passage of water in Q. nigra seeds. The pericarp eventually becomes limiting to continued swelling due to its mechanical strength. During stratification trapped gases escape and continued swelling of the cotyledons causes expansion of the pericarp. Vigorous acorns need around 105 days of combined stratification and germination time to reach maximum germination. This additivity phenomenon is true for stratification times between 4 and 10 wk. Delayed germination is caused by at least 3 factors: mechanical strength of the pericarp, which was constant during the observation period of 13 wk; chemical inhibition by the pericarp, which was alleviated by stratification for .apprx. 4 wk; slowly increasing capacity to imbibe water required for pericarp rupture. This component was apparently not dependent on temperature within the range of 5.degree.-30.degree. C, and operated during the entire stratification and germination period.