The Journal of Horticultural Science & Biotechnology
Vol. 79 No: 3
Effects of low temperature and ethylene on alternative oxidase in green pepper (Capsicum annuum L.)
M TIAN, D GUPTA, X.Y. LEI, S. PRAKASH, C XU and R.W.M. FUNG
Green pepper, a nonclimacteric fruit, was selected as an experimental subject to investigate whether low temperature and ethylene are involved in regulation of mitochondrial respiration (state 3), and alternative oxidase (AOX). Results showed that low temperature(s) (12°C or 0°C) had a stronger stimulatory effect on AOX and mitochondrial respiration compared with ethylene. The effect on AOX was found to be due to induction of new transcription and translation of AOX and was greater at 0°C than at 12°C. Exogenous ethylene (100 μl l-1) stimulated mitochondrial respiration, transcription and translation of existing AOX, but did not induce a new isozyme of AOX. 1-MCP, an ethylene perception inhibitor, had only a small effect on AOX. This can be explained by the fact that AOX, in a nonclimacteric fruit, may not be regulated by its endogenous ethylene that is always at a very low concentration.
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