Effects of Trichoderma asperellum Combined Application on Growth and Photosynthesis Characteristics of Populus davidiana×P.alba var. pyramidlis

doi:10.7525/j.issn.1673-5102.2018.01.008

Abstract

Abstract: In order to prepare compound fungi fertilizer of Trichoderma asperellum, we studied the effects of T.asperellum combined application on the growth and photosynthetic characteristics of Populus davidiana×P.alba var. pyramidlis(Shanxin poplar) by applying the concentration(5×10³ cfu·cm^-3 soil) with different combinations of T.asperellum conidia T1(Ta536+Ta4), T2(Ta536+Ta4+Ta492) and T3(Ta536+Ta4+Ta492+Ta650) to roots of the tissue-cultured Shanxin poplar seedlings under field conditions. Analysis of variance showed that the induction time and different treatments had significant effects on height, basal stem, chlorophyll content, chlorophyll a/b value, P_n, Cond, C_i and T_r(P<0.05): the seedling heights, basal stems and dry weights of the treatment groups were higher than those of control group(CK) in different degree, and the effect was T3> T2> T1> CK; the biomass of poplar seedlings of T3, T2 and T1 separately increased 17.99%、14.28% and 10.54% compared with CK at 60 d; at 15 d, chlorophyll contents separately increased 7.79%, 6.91% and 4.17% and chlorophyll a/b values separately increased 7.79%, 5.84% and 4.73% compared with CK. In addition, the net photosynthetic rate(P_n), intercellular CO₂ concentration(C_i), stomatal conductance(Cond) and transpiration rate(T_r) of the treatment were higher than those of CK, and the maximum net photosynthetic rate, apparent quantum efficiency and light saturation point of the treatment groups were higher than those of CK(P<0.05). At the same time, the interaction between the inducing durations and the different treatments levels of T.asperellum also significantly influenced the above indexes(except for P_n and C_i)(P<0.05). In brief, combination of 4 strains had synergistic effects that can enhance the adaptability of these strains to environment, promote growth and improve photosynthesis characteristics, and the T3 group has the biggest influence and the fastest action on the poplar seedlings.

Key words: Populus davidiana×P.alba var. pyramidlis(Shanxin poplar), Trichoderma asperellum, synergistic effect, growth promotion, photosynthesis

CLC Number:

S792.247

LIU Zhao-Ying, JIANG Chuan-Ying, ZHAI Tong-Tong, CHANG Yuan, YAO Zhi-Hong, LIU Zhi-Hua, ZHANG Rong-Shu. Effects of Trichoderma asperellum Combined Application on Growth and Photosynthesis Characteristics of Populus davidiana×P.alba var. pyramidlis[J]. Bulletin of Botanical Research, 2018, 38(1): 64-74.

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