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Dormancy release and seed ageing in the endangered species Silene diclinis

机译：濒危物种Sildic diclinis的休眠释放和种子老化

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摘要

The influence of seed testa color, temperature and seed water content on dormancy release and seed viability loss in the endangered, endemic species Silene diclinis (Lag.) M. Laínz was evaluated. Dormant heterogeneous seeds (black, red and grey colored) were exposed to three different temperatures (5, 20, and 35°C) and two relative humidities (33 and 60%) in order to assay their dormancy release. Longevity behavior was studied for the three colored seeds, storing samples at nine different combinations of temperature (5, 20 and 35°C) and relative humidities (33, 60 and 90%). According to our findings, seed heteromorphism was not related to neither break of dormancy nor seed storage behavior. Silene diclinis seeds present dormancy after collection, and need an after-ripening period to germinate. Temperature and relative humidity are positively correlated with dormancy release and seed ageing. Therefore, both factors must be carefully controlled during seed manipulation in the laboratory for long term seed conservation purposes. When seeds are stored immediately after collection (dormant), if the temperature of storage is above the base temperature for dormancy release found in this work (between 2.7 and 1.6°C), seeds may eventually overcome dormancy. On the other hand if seeds are stored after an after-ripening period, storage at low temperature does not induce secondary dormancy.
机译：评估了濒危的特有物种Silene diclinis（Lag。）M.Laínz的种子种皮颜色，温度和种子含水量对休眠释放和种子活力丧失的影响。将休眠的异种种子（黑色，红色和灰色）置于三种不同的温度（5、20和35°C）和两种相对湿度（33％和60％）下，以测定其休眠释放。研究了三种有色种子的寿命，将样品存储在温度（5、20和35°C）和相对湿度（33％，60％和90％）的9种不同组合下。根据我们的发现，种子异质性与休眠的中断或种子存储行为均无关。收集后的三叶草种子处于休眠状态，需要经过一段时间的成熟才能发芽。温度和相对湿度与休眠释放和种子老化呈正相关。因此，为了长期保存种子，必须在实验室进行种子处理时仔细控制这两个因素。当种子收集后立即收集（休眠）时，如果存储温度高于这项工作中发现的休眠释放基准温度（2.7至1.6°C之间），则种子最终可能会克服休眠。另一方面，如果种子在成熟后储存，则在低温下储存不会引起二次休眠。

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