Changes in 13C/12C Ratio of CO2 Evolved from CAM Plants with Light Intensities in Relation to Malic Acid Decarboxylation

Biochemie und Physiologie der Pflanzen Pub Date : 1992-11-01 DOI:10.1016/S0015-3796(11)80026-0

Yao-Hua Luo

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引用次数: 1

Abstract

Carbon dioxide evolved by CAM plants (Aloe vera, Neoregelia sp. Sansevieria guineensis) in light (δ13C = 0.8 ± 1.8%) was significantly enriched in ¹³C relative to that in dark (δ13C = -13.0 ± 1.4%). The changes in S 13C values of CO2 with light intensity revealed curves similar to those of photosynthetic rate versus light. The ratio of the amount of collected CO₂ C_c over the amount of malic acid consumed (C_m) declined sharply from low light to about 95 µmol m⁻² s⁻¹. Thereafter, this decline tended to be slow. The δ¹³C values of CO₂ evolved versus the corresponding C_c/C_m were linearly correlated, showing different slopes for each species, which is consistent with the expectations of the model established in this study. The yields of carbon dioxide for each malic acid decarboxylated evaluated from the model equation, termed N, were 3.0, 1.5, and 1.3 for S. guineensis, A. vera, Neoregelia sp., respectively.

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光强下CAM植物13C/12C比值与苹果酸脱羧的关系

CAM植物(Aloe vera, Neoregelia sp. Sansevieria guineensis)在光照条件下(δ13C = 0.8±1.8%)的二氧化碳含量显著高于光照条件下(δ13C = -13.0±1.4%)的二氧化碳含量。CO2 S - 13C值随光强的变化曲线与光合速率随光强的变化曲线相似。在弱光条件下，CO2收集量与苹果酸消耗量之比(Cm)急剧下降至约95µmol m−2 s−1。此后，这种下降趋势趋于缓慢。CO2的δ13C值与相应的Cc/Cm呈线性相关，不同物种的δ13C值呈现不同的斜率，这与本研究建立的模型的预期一致。从模型方程(称为N)中评估的每一个苹果酸脱羧的二氧化碳产率分别为S. guineensis, A. vera, Neoregelia sp. 3.0, 1.5和1.3。

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Biochemie und Physiologie der Pflanzen

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