Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 73:1020-1023 (1983)
© 1983 American Society of Plant Biologists

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Articles

Role of Pit Membranes in Macromolecule-Induced Wilt of Plants 1

Neal K. Van Alfen, Brent D. McMillan, Victoria Turner and Wilford M. Hess

Biology Department UMC 45, Utah State University, Logan, Utah 84322, Botany Department, Brigham Young University, Provo, Utah 84601

Macromolecules present in low concentrations in xylem fluid of Medicago sativa L. var DuPuits will increase the resistance to xylem liquid flow. This increase in resistance was found to be reversible by backflushing the xylem. Autoradiography showed that very large molecules do not pass through pit membrane pores. A comparison of pit membrane pore sizes to molecule sizes suggests that increased resistance to xylem flow is a result of plugging pit membrane pores. It was also found that pit membranes located in two parts of the plant differ in the apparent diameter of their pores and, thus, in their susceptibility to plugging by macromolecules. Macromolecules in xylem fluid may result from hostparasite interactions and may play a significant role in the outcome of the interaction.

1 Supported in part by the Science and Education Administration of the United States Department of Agriculture under Grant No. 7800752 from the Competitive Research Grants Office. This is Journal Series Paper 2755 of the Utah Agricultural Experiment Station, Logan, Utah.




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