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Plant Physiology 75:499-501 (1984)
© 1984 American Society of Plant Biologists

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Articles

Divergent Transport Mechanisms for Pyrimidine Nucleosides in Petunia Pollen

Rajender K. Kamboj and John F. Jackson

Department of Agricultural Biochemistry, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia 5064 Australia

Petunia hybrida pollen exhibits divergent transport mechanisms for pyrimidine nucleosides. Uridine and cytidine show all the properties of being actively transported, a nucleoside transport mechanism not hitherto reported in plant cells. Contrasting with this, thymidine transport has the properties of a nonactive, carrier-mediated system. Reasons for these different mechanisms are considered to lie in the high demand for uridine and cytidine, obtained perhaps from stylar tissue, for the biosynthetic reactions of the pollen tube, while thymidine demand is lower due to the absence of DNA replication in germinating Petunia pollen.




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Copyright © 1984 by the American Society of Plant Biologists