A case of early dissolution of the microsporocyte callose wall in male-sterile (CMS) sweet pepper (Capsicum annuum L.) |
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Authors: | Nguyen Thi Hoa Binh Jarmila Hendrychová-Tomková |
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Institution: | (1) Faculty of Sciences, Charles University, Viničná 5, 128 44 Praha 2, Czechoslovakia |
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Abstract: | On squash preparations of anthers from pollen fertile and sterile plants of sweet pepper (Capsicum annuum L. cv. Severka) callose envelopes of microsporocytes, stained specifically with resorcin blue, were investigated microscopically.
During normal course of microsporogenesis in fertile plants the envelopes remained intact up to the stage of microspore tetrads.
Then callose begins to dissolve, and that from individual microspores towards the envelope periphery. In sterile analogues
of the same cultivar the callose breakdown occurred precociously, usually in the course of the second, but sometimes as early
as the first meiotic division of PMCs. Having completed meiosis sporadic microsporocytes formed microspore tetrads. Most PMCs
contained an undivided four-nucleate protoplast rimmed with a narrow or wider unstained zone of dissolved callose. In certain
cases more condensed callose septa pointing to the furrows on the surface of the PMC protoplast were well-observable in this
lytic zone, as a residuum of normal mechanism of tetradogenesis. |
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