Bartoli Carlos G, Tambussi Eduardo A, Diego Fanello, Foyer Christine H
Instituto de Fisiología Vegetal, Facultad Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, CCT-CONICET, La Plata, Argentina.
FEBS Lett. 2009 Jan 5;583(1):118-22. doi: 10.1016/j.febslet.2008.11.034. Epub 2008 Dec 6.
The effects of red/far red (R/FR) ratios on leaf ascorbate (AA) and glutathione (GSH) accumulation were examined in common bean (Phaseolus vulgaris L.). Growth under low R/FR ratios resulted in a "shade" phenotype and much lower leaf AA and GSH contents than high (R/FR) ratios. Photosynthesis rates were unaffected by changes in the R/FR ratio but leaf respiration rates, pyridine nucleotide pools and antioxidant enzyme activities were decreased under the low R/FR regime. The GSH pool changed slowly in response to altered R/FR ratios but leaf ascorbate acclimated over a single photoperiod. We conclude that light quality signals, particularly R/FR ratios, are important regulators of antioxidant synthesis and accumulation. These acclimatory changes are an early response to changing light environment.
研究了红光/远红光（R/FR）比例对普通菜豆（Phaseolus vulgaris L.）叶片抗坏血酸（AA）和谷胱甘肽（GSH）积累的影响。在低R/FR比例下生长导致出现“遮荫”表型，且叶片AA和GSH含量比高（R/FR）比例时低得多。光合速率不受R/FR比例变化的影响，但在低R/FR条件下叶片呼吸速率、吡啶核苷酸库和抗氧化酶活性降低。GSH库对R/FR比例的改变反应缓慢，但叶片抗坏血酸在单个光周期内就会适应。我们得出结论，光质信号，尤其是R/FR比例，是抗氧化剂合成和积累的重要调节因子。这些适应性变化是对不断变化的光环境的早期反应。
