Author:
Ferguson I.B.,Snelgar W.,Lay-Yee M.,Watkins C.B.,Bowen J.H.
Abstract
Temperatures in the flesh of apple fruit
(Malus domestica Borkh., cv. Braeburn), during diurnal
cycles in summer conditions, were measured continuously using thermocouples.
Flesh temperatures on the exposed side of fruit in direct sunlight reached as
much as 15°C above air temperatures, even when the latter never exceeded
30°C. An increase in expression of heat shock protein (hsp) mRNA and
protein synthesis was associated with these high daily flesh temperatures.
Elevated levels of hsp transcripts were maintained over the night period, but
rapidly dropped after the onset of daytime. There appears to be a diurnal
cycle of hsp gene expression which underlies the heat-induced increases. High
internal temperatures, even under temperate climatic conditions, are likely to
be common in bulky tissues such as fruit, and the ability to withstand such
temperatures is a normal homeostatic response.
Subject
Plant Science,Agronomy and Crop Science
Cited by
47 articles.
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