文献类型： 外文期刊

第一作者： Chen Qing-Liang

作者： Chen Qing-Liang;Wang Zhi-Fen;Shan Cheng-Gang;Zhu Jing-Bin;Chen Qing-Liang;Jia Ya-Min;Guo Yu-Hai

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期刊名称：PAKISTAN JOURNAL OF BOTANY （ 影响因子：0.972； 五年影响因子：0.988 ）

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收录情况： SCI

摘要： The embryo of the mature seed of the parasitic angiosperm Cistanche tubulosa (Schenk) Whigt remains at pro-embryo stage. Little is known about the establishment of shoot and root apical meristems at poles of the embryonic body during postembryonic development. Thus, structure of the embryo of the mature seed and how and what the shoot and root apical meristems develop into during postembryonic development were investigated using light and dissecting stereo-microscopes. In the mature seed, the plumular pole of the embryo consists of large vacuolated, dense cells, containing starch granules and the radicular pole consists of decidedly smaller and denser cells lacking starch. During seed germination and parasitization, plumular pole cells expired without forming the apical meristem or cotyledons; while radicular pole cells formed a meristematic zone, which developed into a young parasite. We therefore conclude that: (1) the embryo of Cistanche consists of a nutrient-storage region (the plumular pole)and a meristematic region (the radicular pole); (2) during postembryonic stages, the plumular pole performs storage function and supplies its stored nutrients as well as those of the endosperm to the radicular pole; the radicular pole was the only originof the apical meristems forming Cistanche. This study provides some useful information on the embryology of the parasitic plant and elucidates the basis for ecological adaptation and evolutionary strategy of this plant.

分类号： Q94