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Publication Type J
Authors Li, Y., S. R. Zhang, J. Song, C. X. Wu, C. Y. Tian and G. Feng
Title Chlorophyll in desiccated seeds of a euhalophyte, Suaeda physophora, and its significancy in plant adaptation to salinity during germination
Source Science in China Series C-Life Sciences
Author Keywords euhalophyte Suaeda physophora cotyledons of dessicated seed chlorophyll germination environment embryos pea
Abstract The seed cotyledons of a euhalophyte, Suaeda physophora, were found to be dark green. The pigment extracted from the cotyledons was proved to be chlorophyll for the absorption spectra curve of extracts the same as that for leaves. Photosynthetic oxygen-exchanging could be detected after the seeds were moistened for 6 h. Microstructure of organelles in cotyledons of ungerminated seeds was detected by transmission electron microscopy. Histochemical pigmentation was used to investigate the degree of damage on the membrane of radicles. A xerophyte, Haloxylon persicum, whose cotyledons of desiccated seeds also contain chlorophyll was used as a comparative species. The results showed that S. physophora maintained the ultra-structure of chloroplasts, the integrity of plasma membranes of radicles kept much better than that of H. persicum, which showed the great adaptability to salinity of the euhalophyte even at the seed-germination stage. Seeds were incubated in 0 and 700 mmol/L NaCl for 10 days in darkness at 20 degrees C, then ungerminated seeds in NaCl solution were transferred to deionised water and reincubated for another 8 days and was recorded the germination recovery. Dry seeds moistened with deionised water germinated gradually in the dark and germination was maximal after 3 or 4 d. Seeds at 700 mmol/L NaCl for 10 d and transferred back to deionised water germinated abruptly, most seeds germinated in one day and photosynthesis was also detected. It is concluded that recovery germination of S. physophora ensured the seeds could germinate rapidly after salinity declines, for example under the mild but transitory favorable edaphic condition in early spring. Photosynthesis function in seeds might also promoted radicle growth and seedling establishment.
Author Address [Li Yang; Zhang ShiRong; Wu ChenXi; Feng Gu] China Agr Univ, Coll Resource & Environm Sci, Beijing 100094, Peoples R China. [Song Jie] Shandong Normal Univ, Coll Life Sci, Jinan 250014, Peoples R China. [Tian ChangYan] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830000, Peoples R China. Feng, G (reprint author), China Agr Univ, Coll Resource & Environm Sci, Beijing 100094, Peoples R China. fenggu@cau.edu.cn
ISSN 1006-9305
ISBN 1006-9305
29-Character Source Abbreviation Sci. China Ser. C-Life Sci.
Publication Date May
Year Published 2008
Volume 51
Issue 5
Beginning Page 410-417
Digital Object Identifier (DOI) 10.1007/s11427-008-0055-3
Unique Article Identifier WOS:000255986200004
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