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- W2064033178 abstract "1. In the foregoing pages has been given an account of our study of the meiosis in early generations of the two most known and spread constant wheat-rye hybrid Erythrospermum 46/131 and Lutescens 27/36 from the Saratof Experimental Station.2. We have observed a number of irregularities to be peculiar to the process of the reduction division in the first hybrid generation, such as, scattered and lagging chromosomes in the metaphases and anaphases of the first division, irregular development of telophases, dyads and tetrads, and, finally, formation of a pollen considerably deformed and poor in cytoplasm.3. A study of the morphology of the chromosomes and the character of their conjugation have enabled us to postulate the presence of wheat-rye chromosomes in the hybrids newly-formed through segmental exchange. The irregularities of the meiotic process in the constant wheat-rye hybrids of the 42-chromosome race and in wheat-rye amphidiploids with 56 chromosomes have been explained by the presence of the rye-wheat chromosomes that are homologous to one another not wholly, but only in their certain parts, which accounts for their weak conjugation and the presence of univalents.4. High yielding capacity of the studied wheat-rye hybrids shows their normal fertility and proves that however strongly marked and numerous the meiotic irregularities in the pollen-mother cell may be, there is usually formed a sufiicient quantity of normal and viable pollen to ensure full fertility of the hybrids. It may be here concluded that there is also developed a sufficient quantity of normal functional eggcells. Since every flower of the wheat-rye hybrids has but one egg-cell and their ears are well filled with grains, it ought to be supposed that the meiosis in the mother cells of macrospore should generally develop without any serious disturbances or even quite regularly.5. Counting of the chromosomes both in the somatic cells and in the reduction division of the studied hybrids has shown adequate results: the number of the somatic ehromosomes is 42, and in the reduction division (in heterotypic metaphases) there are usually found 21 bivalent chromosomes.In conclusion the authors think it a pleasant duty to express their deep gratitude to Dr. V. N. ENGELGARDT who translated the present work." @default.
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- W2064033178 date "1934-01-01" @default.
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- W2064033178 title "A Cytological Study of Constant Wheat-Rye Hybrids" @default.
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- W2064033178 doi "https://doi.org/10.1508/cytologia.5.395" @default.
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