Maturity and temperature influence ethylene‐promoted organ abscission inCamellia
作者:
AllanB. Woolf,
JulieA. Plummer,
John Clemens,
期刊:
New Zealand Journal of Crop and Horticultural Science
(Taylor Available online 1999)
卷期:
Volume 27,
issue 1
页码: 33-41
ISSN:0114-0671
年代: 1999
DOI:10.1080/01140671.1999.9514077
出版商: Taylor & Francis Group
关键词: plant growth regulators;floriculture;plant export;sensitivity;responsiveness
数据来源: Taylor
摘要:
The influence of temperature (1–25°C) and maturity on organ abscission promoted by a range of ethylene concentrations (0.3–100 μl litre‐1) was examined on stem explants of twoCamelliacultivars ('Anticipation’ and ‘Donation';C. salue‐nensis × C. japonica). Time to abscission of 50% of leaf and floral buds was measured. Leaves were most responsive during stem elongation following vegetative budbreak. In contrast, ethylene‐responsiveness of floral buds gradually increased with maturity. Low temperatures (1–5°C) reduced the rate of abscission response to ethylene at all concentrations, but with greatest effect at low concentrations (<2 μl litre‐1). Floral buds of bothCamelliacultivars were more sensitive to ethylene than leaves. Application of a high ethylene concentration correctly determined relative abscission differences for maturity effects, but inter‐organ differences required a range of ethylene concentrations. It is proposed that “responsiveness” be defined as differences in abscission response to a high ethylene concentration (e.g. 10 μl litre‐1), whereas differences in abscission response to low ethylene concentrations (<1 μl litre‐1) be defined as “sensitivity” differences.
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