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Plant Physiol, September 2000, Vol. 124, pp. 431-440
Involvement of Polyamines in the Chilling Tolerance of Cucumber
Cultivars
Wenyun
Shen,
Kazuyoshi
Nada, and
Shoji
Tachibana*
Laboratory of Horticulture, Faculty of Bioresources, Mie
University, Tsu, Mie 514-8507, Japan
The possible involvement of polyamines (PAs) in the chilling
tolerance of cucumber (Cucumis sativus L. cv Jinchun No.
3 and cv Suyo) was investigated. Plants with the first expanded leaves were exposed to 3°C or 15°C in the dark for 24 h (chilling),
and then transferred to 28°C/22°C under a 12-h photoperiod for
another 24 h (rewarming). Chilling-tolerant cv Jinchun No. 3 showed a marked increase of free spermidine (Spd) in leaves, once
during chilling and again during rewarming. Putrescine increased
significantly during rewarming, but the increase of spermine was
slight. Any of these PAs did not increase in chilling-sensitive cv Suyo
during either period. PA-biosynthetic enzyme activities appear to
mediate these differences between cultivars. Pretreatment of Spd to cv Suyo prevented chill-induced increases in the contents of hydrogen peroxide in leaves and activities of NADPH oxidases and NADPH-dependent superoxide generation in microsomes and alleviated chilling injury. Pretreatment of methylglyoxal-bis-(guanylhydrazone), a PA biosynthesis inhibitor, to chilled cv Jinchun No. 3 prevented Spd increase and
enhanced microsomal NADPH oxidase activity and chilling injury. The
results suggest that Spd plays important roles in chilling tolerance of
cucumber, probably through prevention of chill-induced activation of
NADPH oxidases in microsomes.
*
Corresponding author; e-mail tatibana{at}bio.mie-u.ac.jp; fax
81-59-231-9637.
© 2000 American Society of Plant Physiologists
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