Studies on the morphology of the flowers and cytology of the anther development of a DGCMS line in Brassica napus L.

Morphological and cytological observations showed that the pol CMS plants in DGCMS Yi 3A were complete male sterile, had no pollen sac differentiation and had smaller petals and stamens at higher temperature situation. They were partial sterile, had 1～3 pollen sacs in each anther and had relative bigger petals and stamens at lower temperature situation. The DGCMS plants were complete sterile at the both temperature situations, and there was no pollen sac differentiation and had smaller petals and stamens at the higher temperature situation, but there were 1～4 pollen sacs in each anther and had bigger petals and stamens at the lower temperature situation. The cytological characteristics of the anther development were the same as that of GMS plants in Yi 3AB。