Morphological Study on Male Sterility in Radish (Raphanus Sativus L.)

Two types of male sterile flowers,pollen degenerated and stamen shrinked were found by observing the morphology in radish.Cytological observation was made,which indicated that microspore degeneration was a successive process.The abnormality appeared in sporogenic stage and later followed vacuoles and enlarged taptum.The single nuclear microspores did not develop further and at last disappeared.Furthermore,sterile pollen grains were found in fertile anthers.