Photosynthetica, 2018 (vol. 56), issue 2

Photosynthetica 2018, 56(2):512-519 | DOI: 10.1007/s11099-017-0688-1

Low concentrations of glycine inhibit photorespiration and enhance the net rate of photosynthesis in Caragana korshinskii

T. Kang1, H. D. Wu1, B. Y. Lu1, X. J. Luo1, C. M. Gong1, J. Bai1,*
1 College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China

The inhibition of photorespiration can be used to improve plant carbon fixation. In order to compare the effects of three photorespiration inhibitors [glycine, NaHSO3, and isonicotinyl hydrazide (INH)], photosynthetic parameters of leaves sprayed respectively with these chemicals were examined and their inhibiting efficiency was evaluated in Caragana korshinskii. Our results showed that 5 mM glycine could reduce the photorespiratory rate (PR) effectively, while the net photosynthetic rate (PN), stomatal conductance (gs), and intercellular CO2 concentration (Ci) significantly increased. The ratio of electron flow for ribulose-1,5-bisphosphate (RuBP) carboxylation to RuBP oxygenation was elevated markedly. NaHSO3 and INH could also suppress the PR in some cases, whereas PN was not improved. The glyoxylate content increased considerably after application of low concentrations of glycine. These results suggested that low concentrations of glycine could suppress photorespiration by feed-back inhibition of glyoxylate and enhance photosynthesis by regulating gs, Ci, and the distribution of electron flow in C. korshinskii.

Keywords: chlorophyll fluorescence; gas exchange; nonstomatal factor; positive correlation; stomatal factor

Received: March 25, 2016; Accepted: November 18, 2016; Published: June 1, 2018Show citation

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Kang, T., Wu, H.D., Lu, B.Y., Luo, X.J., Gong, C.M., & Bai, J. (2018). Low concentrations of glycine inhibit photorespiration and enhance the net rate of photosynthesis in Caragana korshinskii. Photosynthetica, 56(2), 512-519. doi: 10.1007/s11099-017-0688-1.
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