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Aspartate Transcarbamylase Activity in Healthy and Virus-infected Cowpea and Soybean Leaves. R. F. Lee, Department of Plant Pathology, Kansas State University, Manhattan 66506; B. Johnson(2), and C. L. Niblett(3). (2)(3)Department of Plant Pathology, Kansas State University, Manhattan 66506. Phytopathology 65:1079-1081. Accepted for publication 22 April 1975. DOI: 10.1094/Phyto-65-1079.

The effect of virus infection on aspartate transcarbamylase (ATCase) activity in green tissues was studied using inoculated primary leaves of cowpea and soybean. ATCase activities increased nearly 4-fold in cowpea infected with cowpea mosaic virus (CPMV) and in soybean infected with tobacco ringspot virus (TRSV), as compared to buffer- rubbed controls. Total RNA increases following infection were 5.6- and 1.6-fold that of healthy cowpea and soybean, respectively. Neither virus caused significant change in total buffer-soluble protein. Virus concentrations, as assayed by infectivity, were maximal 8-9 days postinoculation in both hosts.