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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Proteolysis in Cotyledon Cells of Phaseolus vulgaris L.: Changes in Multiple Hydrolase Activities Following Germination

JA Crump and DR Murray

Australian Journal of Plant Physiology 6(4) 467 - 474
Published: 1979

Abstract

Changes in activity of several hydrolytic enzymes were measured in extracts prepared from the cotyledons following germination of bean seeds (Phaseolus vulgaris cv. Hawkesbury Wonder). Aminopeptidase AP2 (phenanthroline-sensitive leucyl β-naphthylamidase), N-carbobenzoxy-L- tyrosine-p-nitrophenol ester (N-CBZ-L-Tyr-pNP) hydrolase, N-benzoyl-L-tyrosineethyl ester (BTEE) hydrolase and acid phosphatase all increased in activity per cotyledon, reaching maximum values after 4, 6, 10 and 10 days respectively. By comparison, aminopeptidase AP1 (phenanthrolineinsensitive leucyl β-naphthylamidase) showed maximum activity after 2 days and declined immediately. α-N-benzoyl-D,L-arginine-p-nitroanilide hydrolase activity was maintained at a maximum value between days 2 and 10 before declining. Differences in maximum activity per cotyledon, initial presence or absence, and timing of both increase and decrease of N-CBZ-L-Tyr-pNP and BTEE hydrolase activities suggest that at least two enzymes contribute to these activities, and that neither activity indicates the presence of a chymotrypsin-like endopeptidase.

https://doi.org/10.1071/PP9790467

© CSIRO 1979

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