Xanthophyll-cycle dynamics and rapid induction of anthocyanin synthesis in Eucalyptus nitens seedlings transferred to photoinhibitory conditions

被引:23
作者
Close, DC
Beadle, CL
机构
[1] Univ Tasmania, CRC Sustainable Product Forestry, Hobart, Tas 7001, Australia
[2] Sch Zool, Hobart, Tas 7001, Australia
[3] Sch Agr, Hobart, Tas 7001, Australia
[4] Sch Plant Sci, Hobart, Tas 7001, Australia
[5] CSIRO, Forestry & Forest Prod, Hobart, Tas 7001, Australia
基金
澳大利亚研究理事会;
关键词
acclimation; chlorophyll; light attenuation; xanthophyll cycle;
D O I
10.1016/j.jplph.2003.10.001
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The effects of rapid induction and subsequent relaxation of cold-induced photo-inhibition on pigment chemistry of Eucalyptus nitens (Deane and Maiden) Maiden seedling leaves was assessed. The seedlings were subjected to four treatments in a nursery, fertilised or non-fertilised and shaded or non-shaded, before induction of photoinhibition in a growth chamber. Within 2 days, growth chamber conditions decreased photochemical efficiency (F-v/F-m) and increased xanthophyll-cycle conversion ratio. This was associated with decreased levels of total chlorophyll and increased levels of xanthophyll-cycle pigments. After 8 days, Fv/Fm of all treatments rose. Anthocyanin levels gradually increased until day eight, except in non-shaded, non-fertilised seedlings, which had high levels before the induction of photoinhibition. Visible spectroscopy indicated increased absorption between 500 and 590 nm, indicative of anthocyanin absorption. Electron transport rate after xanthophyll-cycle relaxation was half that measured before induction of photoinhibition. The findings indicate that anthocyanins may provide a photoprotective role in E. nitens seedlings under conditions of photoinhibition. (C) 2004 Elsevier GmbH. All rights reserved.
引用
收藏
页码:37 / 46
页数:10
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