Effects of virus elmination on seed setting in sweet potato, Ipomoea batatas (L.) Lam.
1991
Murata T.
Using 12 varieties of sweet potato, the number of flowers and seed set were compared between virus-free plants derived from shoot tip culture and virus-infected plants. By using virus-free plants, the number of flowers per plant was significantly increased in 2 varieties and the grafting incompatibility was much improved in 3 varieties. The number of seeds per capsule was also significantly increased in 3 combinations with 4 varieties. The fertility of pollen, the percentage of pollen germination on stigma and the number of pollen tubes passing through conducting tissue were not affected by virus freeing. However, the frequency of normal embryosacs at flowering day and the number of the embryosacs with entry of pollen, which determines the number of embryosacs with normally developed embryos, were also significantly increased by virus freeing. The increase in the number of embryosacs with entry of pollen was considered due to the decrease in the frequency of abnormal embryosacs produced by virus-freeing.
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