XVI International Botanical Congess

There was a high frequency in the occurrence of abnormal plantlets during cotton tissue culture. Their patterns, ways of development and effected factors, and the technique of their normalization were studied. Based on their morphologic characters, they could be classified into several kinds, viz. growing point-, cotyledon-, plumular axis-, abnormal plantlets, poly-pole plantlets, browing-, abino-, vitreous-, and callus-forming plantlets. The growing-point- and the cotyledon-abnormal plantlets which were more nd intrinsic developmental mechanism as the main factor causing the accurrence of abnormal plantlet and also discuss the technical procedures of reducing the occurrence frequency of such abnormal plantlets which greatly impact cotton tissue culture.