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A STUDY ON POLLINATION-RELATED TRAITS IN SOYBEAN MALE-STERILE LINES AND SOYBEAN GERMPLASM

Bai Yangnian Chen Jian Yu Deyue Gai Junyi * * (Soybean Research Institute, Nanjing Agricultural University, National Center of Soybean Improvement, Ministry of Agriculture, Nanjing 210095)  
The investigation for pollination-related traits in soybean cytoplasm-nuclear male-sterile lines and nuclear male sterile lines showed that no significant difference in density of flower-thrips was detected between male-fertile and male sterile plants.The opening degree of keel petals(ODKP) of male-sterile plants was bigger than that of male-fertile plants in a same material. No obvious difference of ODKP was detected between NJCMS1A and NJCMS2A and between N69-2772(ms2) and N69-2771 (ms1) N69-2773(ms3). Outcrossing rate of NJCMS2A was bigger than of NJCMS1A, while the pollen dispersiveness of NJCMS2B happened to be better than that of NJCMS1B. Similarly, outcrossing rate of malesterile plants of N69-2772 was bigger than that of other two nuclear male-sterile lines, while the pollen dispersiveness of male-fertile plants of N69-2772 also happened to be better than that of other two nuclear male-sterile lines. The stigma viability of NJCMS1A could maintain 2.5 days, and petals could have function to protect the stigma viability. Significant differences of female fertility was detected among BC 5.7 families of NJCMS1A and among plants of NJCMS1A, and the BC 5.7 families with better female fertility were screened out. The results on soybean germplasm showed that obvious varation was detected for the traits of petal size, ODKP, pollen dispersiveness, number of pollens per flower, density of flower-thrips. The flowers of G.soja were much smaler than that of G.max, and the pollen dispersiveness of G.soja was better than that of G.max. No significant difference in ODKP and density of flower-thrips was detected between G.max and G.soja. And 30 materials with better pollen dispersiveness, 16 materals with larger ODKP and 4 materials with both were screened out.
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