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Antisense suppression of violaxanthin de-epoxidase in tobacco does not affect plant performance in controlled growth conditions

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Abstract

Violaxanthin de-epoxidase (VDE) catalyzes the de-epoxidation of violaxanthin to antheraxanthin and zeaxanthin in the xanthophyll cycle. Tobacco was transformed with an antisense VDE construct under control of the cauliflower mosaic virus 35S promoter to determine the effect of reduced levels of VDE on plant growth. Screening of 40 independent transformants revealed 18 antisense lines with reduced levels of VDE activity with two in particular (TAS32 and TAS39) having greater than 95% reduction in VDE activity. Northern analysis demonstrated that these transformants had greatly suppressed levels of VDE mRNA. De-epoxidation of violaxanthin was inhibited to such an extent that no zeaxanthin and only very low levels of antheraxanthin could be detected after exposure of leaves to high light (2000 μmol m−2 s−1 for 20 min) with no observable effect on levels of other carotenoids and chlorophyll. Non-photochemical quenching was greatly reduced in the antisense VDE tobacco, demonstrating that a significant level of the non-photochemical quenching in tobacco requires de-epoxidation of violaxanthin. Although the antisense plants demonstrated a greatly impaired de-epoxidation of violaxanthin, no effect on plant growth or photosynthetic rate was found when plants were grown at a photon flux density of 500 or 1000 μmol m−2 s−1 under controlled growth conditions as compared to wild-type tobacco.

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Correspondence to Harry Y. Yamamoto.

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Chang, SH., Bugos, R.C., Sun, WH. et al. Antisense suppression of violaxanthin de-epoxidase in tobacco does not affect plant performance in controlled growth conditions. Photosynthesis Research 64, 95–103 (2000). https://doi.org/10.1023/A:1026518524426

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  • DOI: https://doi.org/10.1023/A:1026518524426