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首页> 外文期刊>Scientia horticulturae >Seed dormancy and germination of Michelia yunnanensis (Magnoliaceae)
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Seed dormancy and germination of Michelia yunnanensis (Magnoliaceae)

机译：云南含笑的种子休眠和萌发

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摘要

Michelia yunnanensis Franch. is a Chinese endemic ornamental shrub with potential for greater utilization as a landscape and medicinal plant if propagation was less difficult. Seed development and breaking of seed dormancy were investigated to improve propagation of M. yunnanensis. No fresh seeds germinated when tested at the time of dispersal. Newly matured seeds of M. yunnanensis contained differentiated linear underdeveloped embryos that were physiologically dormant. The embryo/seed length ratio of M. yunnanensis was 0.15. Warm stratification did not break seed dormancy. Dormancy was broken by cold stratification at 4pC but not by flowing water or nitrate. Embryos developed grew inside seeds during cold stratification at 4pC. In newly harvested dormant seeds, embryos were 0.94mm long and increased in length 139% before radicle emergence (germination). GA substituted for cold stratification to break dormancy in seeds of M. yunnanensis incubated at 25pC or 20/25pC. Mature M. yunnanensis seeds exhibited intermediate complex morphophysiological dormancy. Optimal germination of non-dormant seed in terms of both germination percentage and rate occurred at 20/25pC.
机译：云南含笑是一种中国特有的观赏灌木，如果繁殖较难，则有可能被更多地用作园林和药用植物。研究了种子发育和种子休眠的打破，以提高云南芒草的繁殖。在分散时进行测试时，没有新鲜的种子发芽。云南分枝新近成熟的种子含有生理休眠的分化线性不发达胚。云南分支杆菌的胚/种长比为0.15。温暖的分层不会破坏种子的休眠。通过在4pC下进行冷分层可以打破休眠状态，但不能通过流动水或硝酸盐来打破休眠状态。在4pC的冷分层过程中，发育成的胚生长在种子内部。在新收获的休眠种子中，胚根长0.94mm，在胚根出现（发芽）之前，其长度增加139％。 GA代替冷分层，以打破在25pC或20 / 25pC下孵育的云南分枝种子的休眠。云南成熟的种子表现出中等复杂的形态生理休眠。就发芽率和发芽率而言，非休眠种子的最佳发芽发生在20 / 25pC。

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