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- Title
Short-term responses of photosynthetic membrane lipids and photochemical efficiency in plants of Phaseolus vulgaris and Vigna unguiculata submitted to high irradiance.
- Authors
L. Ferreira; R. Bressan-Smith; T. Elias; F. Silva; L. Viana; J. Oliveira
- Abstract
Abstract??Primary leaves of young plants of common bean (Phaseolus vulgariscv. Carioca and Negro Huasteco) and cowpea (Vigna unguiculataWalp cv. Epace 10) were exposed to high irradiance (HI) of 2 000 ?mol m?2s?1for 10, 20, and 30 min. The initial fluorescence (F0) was nearly constant in response to HI in each genotype except for Carioca. A distinct reduction of maximum fluorescence (Fm) was clearly observed in stressed genotypes of beans after 20 min followed by a slight recovery for the longer stress times. In common bean, the maximum quantum yield (Fv/Fm) was reduced slowly from 10 to 30 min of HI. In cowpea, only a slight reduction of Fv/Fmwas observed at 20 min followed by recovery to normal values at 30 min. HI resulted in changes in the photochemical (qP) and non-photochemical (qN) quenching in both species, but to a different extent. In cowpea plants, more efficiency in the use of the absorbed energy under photoinhibitory conditions was related to increase in qPand decrease in qN. In addition, lipid peroxidation changed significantly in common bean genotypes with an evident increase after 20 min of HI. Hence the photosynthetic apparatus of cowpea was more tolerant to HI than that of common bean and the integrity of cowpea cell membranes was apparently maintained under HI.
- Subjects
MEMBRANE lipids; KIDNEY bean; COWPEA; FLUORESCENCE
- Publication
Photosynthetica, 2007, Vol 45, Issue 1, p23
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-007-0004-6