Delayed dehiscence of the pericarp: role in germination and retention of viability of seeds of two cold desert annual Brassicaceae species.
Delayed dehiscence of the pericarp: role in germination and retention of viability of seeds of two cold desert annual Brassicaceae species.
复制标题
DOI：
10.1111/plb.12457
复制
发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
J. Lu;D. Tan;C. Baskin;J. Baskin
中科院分区：
文献类型：
--
作者：
J. Lu;D. Tan;C. Baskin;J. Baskin
相当大的变化发生在成熟后的时间开裂在果实的菊科物种，和一些研究表明，果皮在种子萌发和保持活力的物种与不裂的果实中起着重要的作用。然而，在田间，果皮开裂延迟<1年对种子生物学的意义知之甚少。因此，我们确定了在果实成熟和传播后<1年打开的薄叶蕨和Neotorularia korolkovii的果皮在种子萌发和保持种子生活力中的作用。我们比较了休眠打破后熟在实验室和发芽物候和保留完整的角果和孤立的种子埋在实验花园的种子活力。这两个物种的种子都有6型非深度生理休眠，这是由果皮增强。这两个物种的种子后熟在2013年夏天，其中一些在秋季发芽，一些在次年春天在浇水和不浇水的土壤。2014年春天，果皮打开后，角果中种子的发芽率在土壤中增加。L. filifolium和N. korolkovii分别在2014年春季和2015年夏季发芽或死亡，而（打开的）果皮中的两个物种的60%的种子在24个月后仍能存活。因此，虽然果皮在埋藏后9-10个月才打开，但它的存在对种子休眠、萌发物候和保持种子生活力有显著影响。filifolium和N. korolkovii。
Considerable variation occurs in post-maturity timing of dehiscence in fruits of Brassicaceae species, and several studies have shown that the pericarp plays an important role in seed germination and retention of viability in species with indehiscent fruits. However, little is known about the significance to seed biology of delay in pericarp dehiscence for <1 year in the field. Thus, we determined the role of the pericarps of Leptaleum filifolium and Neotorularia korolkovii, which open in <1 year after fruit maturity and dispersal, in seed germination and retention of seed viability. We compared dormancy-break via after-ripening in the laboratory and germination phenology and retention of seed viability in intact siliques and isolated seeds buried in an experimental garden. Seeds of both species have Type 6 non-deep physiological dormancy, which is enhanced by the pericarp. Seeds of both species after-ripened during summer 2013, and some of them germinated in autumn and some in the following spring in watered and non-watered soil. Germination percentages of seeds in siliques increased in soil in spring 2014, after the pericarps had opened. Most isolated seeds of L. filifolium and N. korolkovii had germinated or were dead by spring 2014 and summer 2015, respectively, whereas 60% of the seeds of both species in the (opened) pericarps were viable after 24 months. Thus, although the pericarp opened 9-10 months after burial, its presence had a significant effect on seed dormancy, germination phenology and retention of viability of seeds of L. filifolium and N. korolkovii.