Breeding of the POL-CMS line BE23A in Brassic napus

摘要

Pol-CMS Line BE23A was bred by the Pol-cms 254A as sterile resource and the intespcific hybrid offspring (B. napus × B.campestirs) as a new maintainer materiel through backcross and testcross for several generations. Some intespcific characters such as short plant, big petal and full nectary has been found which is useful for hybrid seed production. This bred line has stable male sterility with thin and long bud, shriveled anther and slow in reaction to low temperature. Over 95% purity has been gotten by this sterile line for commercial hybrid seed production in natural condition. Through the press selection, it is with double low quality and good economic characters. The combinations completed by BE23A were promoting yield 5.3%-19.5 than those completed by original sterile line 254A when the same restorer lines were used.