Microsporogenesis in genic male-sterile lines of barley (Hordeum vulgare)

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Abstract
Pollen development has been studied by various microscopical techniques in five genic male-sterile lines and in male-fertile lines of barley (Hordeum vulgare L.). Two of the male-sterile lines (msg,,ho and msg,,fz) exhibited apparently identical abnormalities: defective cytokinesis at the end of meiosis 1. Another male-sterile gene (msg,,fg) also appeared to cause defects at this stage; in this case nuclear restitution was incomplete. In the male-sterile line msg,,gf a failure of the periclinal division of the inner secondary parietal layer occurred, so that a tapetal layer was not formed. Development was normal through meiosis in anthers from msg,,fp plants until the early vacuolated microspore stage when normal sporopollenin production was inhibited.