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- W2387565706 abstract "s: Eco-geographic difference, grade and variation of cold tolerance at seeding stage 598 accessions core collection from prefectures and rice regions zone in Yunnan rice were identified using Nagamine et al (1991) under 5 °C low temperature condition. Results showed that it was bigger difference for cold tolerance at seedling stage among prefectures, average grade for I (4.70)II(4.78)V(4.79)III(5.34)IV(5.36), frequency of cold tolerance landraces for II (45%)I(25%)III(22.5%)V(5.0%) IV(2.5%), and coefficient of variation of II(32.22%)I(31.28%)V (29.65%) III (19.66%)IV(19.59%). Their cold tolerance at seedling stage were closely related to seedling grown on winter or spring and cold fountain under cold stress, the cold tolerance at seedling stage resulted from the synergetic evolution of Yunnan rice and low temperature for seedling grown between winter on southern Yunnan and spring on middle Yunnan. The germplasms of cold tolerance were not only widely existed on tropic, subtropic and temperature zone, but also difference with cold tolerance among plants of one landrace. There was relatively bigger difference for cold tolerance at seedling stage of core collection among 16 prefectures in Yunnan rice landraces. It was divided into three re- gions according to cold tolerance at seedling stage, climatic and ecology: Serious Cold Damage and Diversity Smallness Region including 5 prefectures i.e. Qujing, Dali, Chuxiong, Kunming and Lijiang, 3.65~4.32 of average grades for cold tolerance, cultivars of 0—2 grade account for 27.5% (2.5%~10%) and cold fountain with high elevation; Cold Damage Diversity Center Region includ- ing 6 prefectures, i.e. Wenshan, Honghe, Simao, Baoshan, Dehong and Licang, 4.45~5.40 of average grades for cold tolerance, culti- vars of 0—2 grade account for 70%(5%~30%) and seedling grown on Winter or Spring. Light Cold Damage and Diversity Diffuse Region including 5 prefectures, i.e. Nujiang, Yux, Zhaotong, Diqing and Xishuangbanna, 5.05-5.87 of average grades for cold toler- ance, cultivars of 0—2 grade account for 2.5%(0~2.5%). It is an important role on evolution of cold tolerant landrace at seedling stage for core collection in Yunnan rice about seedling grown on winter or spring and irrigation for cold fountain on high elevation." @default.
- W2387565706 created "2016-06-24" @default.
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- W2387565706 date "2006-01-01" @default.
- W2387565706 modified "2023-09-27" @default.
- W2387565706 title "Eco-geographic difference and cold tolerance at seeding stage of core collection for rice in Yunnan" @default.
- W2387565706 hasPublicationYear "2006" @default.
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