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GrainGenes Reference Report: PPS-132-2116

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Reference	PPS-132-2116
Title	Thylakoid-bound ascorbate peroxidase mutant exhibits impaired electron transport and photosynthetic activity
Journal	Plant Physiology
Year	2003
Volume	132
Pages	2116-2125
Author	Danna CH [ Show all 7 ]
Abstract	Summary: In chloroplasts, stromal and thylakoid-bound ascorbate peroxidases (tAPX) play a major role in the removal of H2O2 produced during photosynthesis. Here, we report that hexaploid wheat (Triticum aestivum) expresses three homeologous tAPX genes (TaAPX-6A, TaAPX-6B, and TaAPX-6D) mapping on group-6 chromosomes. The tAPX activity of a mutant line lacking TaAPX-6B was 40% lower than that of the wild type. When grown at high-light intensity photosystem II electron transfer, photosynthetic activity and biomass accumulation were significantly reduced in this mutant, suggesting that tAPX activity is essential for photosynthesis. Despite the reduced tAPX activity, mutant plants did not exhibit oxidative damage probably due to the reduced photochemical activity. This might be the result of a compensating mechanism to prevent oxidative damage having as a consequence a decrease in growth of the tAPX mutant plants
External Databases	Pubmed: 12913166
Keyword	[ Hide all but 1 of 29 ] ascorbate ascorbate peroxidase biomass damage electron-transfer electron-transport escherichia coli gene growth hexaploid hexaploid wheat highlight hydrogen peroxide lacking mapping monodehydroascorbate radical reductase mutant oxidative stress photooxidative stress photosynthesis photosystem ii removal sinvalocho ma wheat spinach chloroplasts transfer transport triticum wild wild-type

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