Plant Physiol.
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Plant Physiology 68:1389-1394 (1981)
© 1981 American Society of Plant Biologists

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Articles

Synthesis, Salvage, and Catabolism of Uridine Nucleotides in Boron-Deficient Squash Roots 1

Carol J. Lovatt2, Luke S. Albert and George C. Tremblay

Department of Botany, University of Rhode Island, Kingston, Rhode Island 02881, Department of Biochemistry and Biophysics, University of Rhode Island, Kingston, Rhode Island 02881

Previous work has provided evidence that plants may require boron to maintain adequate levels of pyrimidine nucleotides, suggesting that the state of boron deficiency may actually be one of pyrimidine starvation. Since the availability of pyrimidine nucleotides is influenced by their rates of synthesis, salvage, and catabolism, we compared these activities in the terminal 3 centimeters of roots excised from boron-deficient and -sufficient squash plants (Cucurbita pepo L.). Transferring 5-day-old squash plants to a boron-deficient nutrient solution resulted in cessation of root elongation within 18 hours. However, withholding boron for up to 30 hours did not result in either impaired de novo pyrimidine biosynthesis or a change in the sensitivity of the de novo pathway to regulation by end product inhibition. Boron deprivation had no significant effect on pyrimidine salvage or catabolism. These results provide evidence that boron-deficient plants are not starved for uridine nucleotides collectively. Whether a particular pyrimidine nucleotide or derivative is limiting during boron deprivation remains to be examined.

2 The work here was also submitted in partial fulfillment of the requirements for the PhD in Biological Sciences (Botany) at the University of Rhode Island. Present address: Department of Botany and Plant Sciences, University of California, Riverside, CA 92521.

1 Supported by National Science Foundation Grant PCM 76-20594 and by an award from Sigma Delta Epsilon (to C. J. L.).






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Copyright © 1981 by the American Society of Plant Biologists