Cytology and pollen grain fertility in populations of Astragalus adsurgens Pall. indigenous to Yunwu Mountain in the Loess Plateau,north-west China |
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| Authors: | F. Kita A. Hongo H. Zou J. Cheng Z. Zhao |
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| Affiliation: | (1) Hokkaido University, Kita 14 Nishi 3, Kitaku, 001 Sapporo, Hokkaido, Japan;(2) Department of Agro-environmental Science, Obihiro University of Agriculture and Veterinary Medicine, 080 Obihiro, Hokkaido, Japan;(3) North Western Institute of Soil and Water Conservation, Academia Sinica, Yangling, Shanxi, China;(4) Yunwu Mountain Pastoral Preserve Station, Guyan Country, Ningxia Hui Autonomous Region, China |
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| Abstract: | Summary The wild type populations of Astragalus adsurgens Pall. growing on the northern slopes of Yunwu Mountain were investigated as a part of the program on the reclamation of the Loess Plateau, north-west China.In 1990, plants were sampled from two populations indigenous to Yunwu Mountain and Liupan Mountain, and two populations cultivated in experimental plots. Pollen grain fertility of the plants showed a wide variation from 20 to 99%. In 1991, cytological analysis of chromosome behaviour during meiosis was carried out in order to clarify the causal factors of pollen grain sterility. In anaphase-1, a chromatid bridge and an acentric fragment as well as two chromatid bridges were observed in high frequencies. In addition, more than two chromatid bridges per nucleus existed in considerably high frequencies.These observations clearly indicate that inversions are dominant in populations of wild A. adsurgens indigenous to Yunwu Mountain. xxThis study was supported by a Grant-in-Aid for scientific research from the Ministry of Education, Science and Culture, Japan (No. 01102023). |
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| Keywords: | Astragalus adsurgens cytology inversion Loess Plateau pollen grain fertility |
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