Developmental changes in gene expression during pollen differentiation and maturation inNicotiana tabacum L |
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Authors: | J Tupý J Süss Eva Hrabětová Ludmila ?íhova |
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Institution: | 1. Institute of Experimental Botany, Czechoslovak Academy of Sciences, Flemingovo nàm. 2, 160 00, Praha 6, Czechoslovakia
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Abstract: | Total and polysome-bound ribosomes and the uptake and incorporation of3H-uridine and14C-leucine were examined in dividing microspores and in pollen grains isolated from anthers of 6 different developmental stages. Direct evidence was obtained that the formation of cytoplasm of the vegetative cell following microspore division is related to a rapid activation of RNA and protein synthesis and of ribosomes in differentiating pollen. Total ribosomes associated with gametophytic programme rose about 10times and the process of differentiation was accompanied by a rapid increase in uptake capacity of pollen grains for both uridine and leucine. Pollen development after cytoplasm synthesis and starch deposition continued by pollen maturation, which was characterized by a decline in RNA synthesis, dissociation of polysomes and by a further rise of transport activity of pollen grain wall for exogenous substrates, indicating probable pollen adaptation for utilization of metabolites from the degenerating tapetal cytoplasm. |
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