Effect of cold storage on proteinase and chorismate mutase activities inSolanum tuberosum L. Genotypes differing in blackspot susceptibility |
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| Authors: | Robert P Sabba Bill B Dean |
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| Institution: | 1. New Mexico State University, Dept. 3BE, Box 3003, 88093-0003, Las Cruces, NM
2. Irrigated Agriculture Research and Extension Center, Washington State University-Prosser, 24106 N. Bunn Rd., 99350-9687, Prosser, WA
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| Abstract: | Potato tubers (Solanum tuberosum) from genotypes differing in chemical susceptibility to the physiological disorder blackspot bruise (TXA 763-5, Atlantic, Ranger Russet, Russet Burbank, and Lemhi Russet) were stored for eight months at 3 C. Protein extracts from each cultivar were assayed for proteinase and chorismate mutase (CM) activities. During cold storage, three of five genotypes tested increased in their ability to develop melanintype pigments responsible for blackspot. Concurrent with this were increases in either endopeptidase, aminopeptidase, or CM activities or combinations of enzyme activities specific to genotypes. These increases in enzyme activity may be responsible for the increase in levels of the melanin precursor tyrosine, associated with cold storage of potato tubers. |
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