Cytology and Fertility of Derivatives of Agroelymus turneri
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概要
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Plant populations derived from seed resulting from open-pollination of the putative hybrid, Agroelymus turneri, have been within progenies:-(a) uniformly similar to Agropyron repens; (b) uniformly similar to Elymus canadensis; or (c) segregated in plants similar to Agropyron repens, A. dasystachyum and Elymus canadensis.Seed-set following self-pollination of Agropyron repens-like plants varied from 0 to 7%; open-pollination fertility varied from 23 to 72% in the F2 population derived from seed produced at Madison and from 27 to 44% in the Fort Saskatchewan population. Elymus-like plants averaged 44% selffertility; fertility following open-pollination was not obtained. Florets of Agropyron dasystachyum-like plants were 11% self-fertile compared to 35% cross-fertile. Seed formed in some A. repens-like plants characterized by low levels of pollen stainability. There was no evidence from studies of the developing female gametophyte that indicated any form of apomixis was operative.Microsporocyte development studies indicated elimination of sporocytes due to the accumulation of extraneous materials in the thread mass during prophase stages of development, i.e., prophase lethality. Sporocytes progressing further than metaphase I were generally quite regular in their meiotic divisions.The forms of sterility encountered may be due to an unbalanced enzyme and amino acid synthesis brought about by the fusion of dissimilar gametes. Sterility appeared to be related to the interaction of nucleus with the noncomplimentary cytoplasm.
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財団法人 日本メンデル協会 | 論文
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