Red/blue light ratio strongly affects steady-state photosynthesis, but hardly affects photosynthetic induction in tomato (Solanum lycopersicum)
Red/blue light ratio strongly affects steady-state photosynthesis, but hardly affects photosynthetic induction in tomato (Solanum lycopersicum)
复制标题
红/蓝光比强烈影响稳态光合作用，但几乎不影响番茄（Solanum lycopersicum）的光合作用诱导
DOI：
10.1111/ppl.12876
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发表时间：
2018
影响因子：
6.4
通讯作者：
Tao Li
中科院分区：
文献类型：
--
作者：
Yuqi Zhang;Elias Kaiser;Yating Zhang;Qichang Yang;Tao Li
植物经常受到快速变化的光照强度和质量的影响。虽然红光和蓝光的短期和长期变化都会影响叶片的光合作用，但它们对动态光合作用的影响还没有很好的文献记载。对番茄叶片的动态和稳态光合作用特性进行了测试，无论是在生长过程中还是在测量过程中，红/蓝比是如何影响的。使用四种红/蓝比例：单色红(R100)、单色蓝(B100)、红/蓝光比9：1(R90B10)和红/蓝光比7：3(R70B30)。R100生长的叶片表现出光合作用能力(光饱和光合作用、羧化、电子传递和磷酸三糖利用的最大速率)、叶片厚度和氮素浓度的降低。不同红/蓝比的驯化对暗适应叶片的光合作用诱导影响有限。B100处理的叶片初始NPQ瞬变时间比其他处理大约15%，这可能有利于在波动光下进行光保护。B100叶片在弱光下也表现出较快的气孔关闭速度，这可能是由于气孔较小和气孔密度较高所致。在不同红/蓝比下测定时，室内培养叶片和温室栽培叶片的气孔张开速率和光合作用诱导速率几乎不随蓝光比例的增加而加快。然而，在测定过程中，暴露于B100的叶片在光合作用诱导后30 分钟的稳态光合作用速率显著降低。我们的结论是，在生长和测量过程中改变红/蓝光比对稳态光合作用有很大影响，但对光合作用诱导速率的影响有限。
Plants are often subjected to rapidly alternating light intensity and quality. While both short‐ and long‐term changes in red and blue light affect leaf photosynthesis, their impact on dynamic photosynthesis is not well documented. It was tested how dynamic and steady‐state photosynthetic traits were affected by red/blue ratios, either during growth or during measurements, in tomato leaves. Four red/blue ratios were used: monochromatic red (R100), monochromatic blue (B100), a red/blue light ratio of 9:1 (R90B10) and a red/blue light ratio of 7:3 (R70B30). R100grown leaves showed decreased photosynthetic capacity (maximum rates of light‐saturated photosynthesis, carboxylation, electron transport and triose phosphate use), leaf thickness and nitrogen concentrations. Acclimation to various red/blue ratios had limited effects on photosynthetic induction in dark‐adapted leaves. B100‐grown leaves had a approximately 15% larger initial NPQ transient than the other treatments, which may be beneficial for photoprotection under fluctuating light. B100‐grown leaves also showed faster stomatal closure when exposed to low light intensity, which likely resulted from smaller stomata and higher stomatal density. When measured under different red/blue ratios, stomatal opening rate and photosynthetic induction rate were hardly accelerated by increased fractions of blue light in both growth chamber‐grown leaves and greenhouse‐grown leaves. However, steady‐state photosynthesis rate 30 min after photosynthetic induction was strongly reduced in leaves exposed to B100during the measurement. We conclude that varying red/blue light ratios during growth and measurement strongly affects steady‐state photosynthesis, but has limited effects on photosynthetic induction rate.