The effect of Phoma medicaginis on the photosynthetic physiology of Medicago sativa

doi:10.11686/cyxb2016275

Abstract

Abstract:

The yield and quality of Medicago sativa are seriously affected by the fungal pathogen Phoma medicaginis. A study has been undertaken using growth chamber pot experiments and the LI-6400/XT photosynthesis measurement system to investigate the effects of this pathogen on the photosynthetic physiology of M. sativa. The results showed that until 27 days post-inoculation (dpi) the net photosynthetic rate (P_n), stomatal conductance (G_s) and transpiration rate (T_r) of M. sativa were reduced by P. medicaginis infection. In the early stages of infection there were little changes in intercellular CO₂ concentration (C_i) in the leaves. By 23 dpi, infected leaves showed significant reductions in photochemical quantum efficiency (F_v/F_m), PSⅡ reaction center of excitation energy capture efficiency (F_v'/F_m'), the relative quantum efficiency of PSⅡ photochemistry (Φ_PSⅡ), electron transfer rate (ETR), photochemical quenching (qP) and non-photochemical quenching (qN). Light compensation point, CO₂ compensation point and carboxylation efficiency (CE) also decreased. The results indicate that the photosynthetic electron transfer rate and capture efficiency, non-photochemical quenching (qN), and carboxylation efficiency (CE) decreased in leaves infected by P. medicaginis, leading to light suppression and a decrease in the assimilation of CO₂ that affect the growth and development of M. sativa.

FAN Qin, LI Yan-Zhong. The effect of Phoma medicaginis on the photosynthetic physiology of Medicago sativa[J]. Acta Prataculturae Sinica, 2017, 26(1): 112-121.

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