Short-term impacts of enhanced UV-B radiation on photo-assimilate allocation and metabolism: a possible interpretation for time-dependent inhibition of growth

被引:37
作者
Gwynn-Jones, D [1 ]
机构
[1] Univ Wales, Inst Biol Sci, Aberystwyth SY23 3DA, Ceredigion, Wales
关键词
growth; maintenance respiration; protection; repair; source-sink relations; UV-B;
D O I
10.1023/A:1012963021074
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
To test the hypothesis that plant source-sink relations are important in determining response to UV-B radiation, a short-term (45 d) field experiment was conducted at Abisko Scientific Research Station, Abisko, Sweden (68 degrees N). Tillers of the grass Calamagrostis purpurea were grown outdoors at levels of UV-B radiation representing 25% ozone depletion. Growth, respiration, photo-assimilate allocation and UV-B protective compounds were subsequently measured. There were no significant effects of enhanced UV-B on total plant dry weight, leaf area, Shoot: Root ratio, leaf weight ratio, leaf area ratio, specific leaf area, tiller number per plant or blade thickness of this species. However, the amount of UV-B absorbing compounds and respiration rates were significantly increased in young and mature leaves. Increases in leaf respiration were accompanied by alterations in plant carbohydrate allocation at enhanced UV-B. The amount of soluble root carbohydrates was reduced following UV-B exposure. Enhanced UV-B also caused increases in the soluble sugar: starch ratio of young leaves, the stem and total aboveground biomass. The importance of source-sink relations and constitutive versus induced defense are discussed in relation to UV-B response.
引用
收藏
页码:65 / +
页数:8
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