Effects of growth-promoting strain Mycena sp M23 on photosynthesis of Aronia melanocarpa

doi:10.13287/j.1001-9332.202108.032

Abstract

Abstract: The agronomic traits, chlorophyll content, physiological indices of Aronia melanocarpa were compared in five treatments, namely negative control (CK), positive control (PCK), low dose of microbial inoculant (T₁, 50 g per seedling), moderate dose of microbial inoculant (T₂, 100 g per seedling), high dose of microbial inoculant (T₃, 200 g per seedling) in field. The diurnal variation of net photosynthetic rate was measured by Li-6400 portable photosynthesis system. The diurnal variation of net photosynthetic rate (P_n) of A. melanocarpa showed a pattern of bi-modal curve with photosynthetic “noon break” phenomenon, which occurred at 1:00 pm. At that time, stomatal conductance (g_s) and transpiration rate (T_r) of A. melanocarpa showed a dramatic decline, while intercellular CO₂ concentration (C_i) significantly rose. It was a photosynthetic “noon break” phenomenon caused by non-stomatal limitation. Application of inoculant to A. melanocarpa successfully avoided the photosynthetic “noon break” phenomenon. Compared with average value of CK and PCK, P_n, g_s, T_r, water use efficiency (WUE) and light utilization efficiency (LUE) of inoculation groups increased by 113%, 91%, 50%, 48% and 117% at 1:00 pm. Daily mean of P_n, g_s, T_r and LUE of inoculation group was 1.5, 1.9, 1.4 and 1.5 times as that of average value of CK and PCK. The inductive effect of high dose of microbial inoculant treatment was the best among inoculation treatments, with the seedling height 1.2 times as that of the moderate and low inoculant groups. All growth indices, photosynthetic parameters and resistant physiological indices of high dose group were superior to other groups. Our results suggested that fungi M23 could improve the adaptability of A. melanocarpa to environmental stresses and promote its growth by increasing photosynthesis, with the inductive effect of high dose being the best.

Key words: Aronia melanocarpa, Mycena, photosynthetic parameter, photosynthetic “noon break” phenomenon

SHAN Ting-ting, ZHOU Li-si, LI Bing, CHEN Xiao-mei, GUO Shun-xing, LI Fei, LU Wei. Effects of growth-promoting strain Mycena sp M23 on photosynthesis of Aronia melanocarpa[J]. Chinese Journal of Applied Ecology, 2021, 32(8): 2931-2938.

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