Responses of rainforest understorey plants to excess light during sunflecks

被引:59
作者
Watling, JR
Robinson, SA
Woodrow, IE
Osmond, CB
机构
[1] JAMES COOK UNIV N QUEENSLAND,DEPT BOT & TROP AGR,TOWNSVILLE,QLD 4811,AUSTRALIA
[2] AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,PHOTOBIOENERGET GRP,INST ADV STUDIES,CANBERRA,ACT 2601,AUSTRALIA
[3] UNIV MELBOURNE,SCH BOT,PARKVILLE,VIC 3052,AUSTRALIA
[4] UNIV WOLLONGONG,WOLLONGONG,NSW 2522,AUSTRALIA
来源
AUSTRALIAN JOURNAL OF PLANT PHYSIOLOGY | 1997年 / 24卷 / 01期
关键词
D O I
10.1071/PP96074
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Responses of Alocasia macrorrhiza (L.) G. Don, Castanospora alphandii (F. Muell.) F. Muell. and Alpinia hylandii R. Smith, growing in a tropical rainforest understorey, to excess light during sunflecks were investigated using chlorophyll fluorescence techniques and by analysing xanthophyll cycle activity. A fourth species, the pioneer Omalanthus novo-guineensis (Warb.) Schum., growing in a small gap, was also studied. In all three understorey species there were large and rapid decreases in the proportion of open Photosystem II (PSII) centres, as indicated by q(p), on illumination with saturating light and a concurrent increase in non-photochemical quenching. q(p) remained low (< 0.4) throughout the period of illumination (similar to 15 min), although it did increase gradually, probably reflecting photosynthetic induction. Sustained declines (up to 120 min) in quantum yield, indicated by F-v/F-m, occurred in all three understorey species following exposure to saturating Photon flux density (PFD) during sunflecks. When phi PSII was monitored during sunflecks it was found to be very sensitive to changes in PFD, declining rapidly with even modest rises in the latter. There was rapid and continuing net conversion of violaxanthin (V) to antheraxanthin plus zeaxanthin (A+Z) on exposure of A. macrorrhiza and C. alphandii to saturating sunflecks. On returning to low light A. macrorrhiza retained its high levels of A+Z for up to 60 min, while C. alphandii rapidly converted back to V. O. novo-guineensis responded to high light by changing its leaf angle to reduce interception and showed no indication of photoinhibition during or after exposure.
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页码:17 / 25
页数:9
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