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Seed coat anatomy of Cercis chinensis and its relationship to water uptake

文献类型： 外文期刊

作者： Wang, Huan 1 ; Chen, Li 1 ; Dai, Song 2 ; Ma, Qiuyue 1 ; Wu, Yang 1 ; Ma, Qingjiang 1 ; Li, Shuxian 1 ;

作者机构： 1.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China

2.Tongren Acad Sci, Tongren 554300, Peoples R China; Jiangsu Acad Agr Sci, Inst Leisure Agr, Nanjing 210014, Peoples R China; Forestry Seedling Stn Qinghai, Xining 810008, Peoples R China

关键词： Cercis chinensis; imbibition; seed hardness; seed coat impermeability; water uptake

期刊名称：CANADIAN JOURNAL OF PLANT SCIENCE （ 影响因子：1.018； 五年影响因子：1.242 ）

ISSN： 0008-4220

年卷期： 2020 年 100 卷 3 期

页码：

收录情况： SCI

摘要： The hard seed coat of Cercis chinensis Bunge is an important factor of its dormancy. A study of the characteristics of water absorption is vital for understanding seed dormancy and germination. This investigation found that soaking in water at an initial temperature of 80 degrees C for 5 min was optimal for breaking the hardness of C. chinensis seeds Scanning electron microscopy (SEM), dye-tracking, and blocking experiments were used to examine the major water entry sites and the relationship between water uptake and seed coat structure during C. chinensis seed imbibition. The SEM images showed that the seed coat consisted of three layers: epidermis, palisade, and sclereid. Special light line, vascular bundle, and counter-palisade layer structures were found in the side of the hilum. The blocking experiments showed that the hilar region was an important water absorption site because, if the region was not blocked, it showed the highest water absorption when imbibed for 3-12 h. However, all parts of the seed coat can absorb water if enough time is allowed after the seed coat hardness has been broken. The dye-tracking test showed that after 3 h water entered the seed only via the hilum fissure. Therefore, the hilum fissure acts as the initial site of water absorption. When more time was allowed, water moved more rapidly on the side with vascular bundles than on the opposite side.

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