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Dormancy breakage in Cercis chinensis seeds

文献类型： 外文期刊

作者： Gao, Yunpeng 1 ; Zhu, Mingwei 1 ; Ma, Qiuyue 2 ; 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.Jiangsu Acad Agr Sci, Inst Leisure Agr, Nanjing 210014, Peoples R China

关键词： Cercis chinensis; seed dormancy; water uptake; endogenous inhibitors; cold stratification

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 6 期

页码：

收录情况： SCI

摘要： The seeds of Cercis chinensis Bunge are important for reproduction and propagation, but strong dormancy controls their germination. To elucidate the causes of seed dormancy in C. chinensis, we investigated the permeability of the hard seed coat and the contribution of the endosperm to physical dormancy, and we examined the effect of extracts from the seed coat and endosperm. In addition, the effectiveness of scarification methods to break seed dormancy was compared. Cercis chinensis seeds exhibited physical and physiological dormancy. The hard seed coat played an important role in limiting water uptake, and the endosperm acted as a physical barrier that restricted embryo development in imbibed seeds. Germination percentage of Chinese cabbage [Brassica rapa subsp. chinensis (L.) Hanelt] seeds was reduced from 98% (control) to 28.3% and 56.7% with a seed-coat extract and an endosperm extract, respectively. This demonstrated that both the seed coat and endosperm contained endogenous inhibitors, but the seed-coat extract resulted in stronger inhibition. Mechanical scarification, thermal scarification, and chemical scarification had positive effects on C. chinensis seed germination. Soaking non-scarified seeds in gibberellic acid (GA(3)) solution did not promote germination; however, treatment with exogenous GA(3) following scarification significantly improved germination. The optimal method for promoting C. chinensis seed germination was soaking scarified seeds in 500 mg.L-1 GA(3) for 24 h followed by cold stratification at 5 degrees C for 2 mo.

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