Male Sterility in Diploid Ageratum conyzoides L

抄録

Genetic control, time of ms gene action over microsporogenesis, plant phenotype and the breeding value of a diploid (2n=20) male sterile Ageratum conyzoides are described. The male sterility is controlled by a recessive gene on a single locus. This gene acts immediately after the microspores are released from the tetrads. The floral heads of the male sterile plants are compact and their stigma protrusion is slow. This trait differentiates them from the male fertiles in which the stigma exsertion is brisk and prolific. The breeding value of this male sterility is low.