Effect of Arbuscular Mycorrhizal Fungi on Photosynthetic Characteristics in Maize Plants under High Temperature Stress

doi:10.3969/j.issn.1000-7091.2013.02.020

Abstract

Abstract: The effect of arbuscular mycorhizal(AM)fungusglomus etunicatum on characteristics of thegrowth,relative chlorophyll content,photosynthesis and chlorophyll fluorescence in maize(Zea mays L.)plants was studied in pot culture under high temperature stress. Under high temperature stress,mycorrhizal maize plants had higher rel-ative chlorophyll content compared to non-mycorrhizal plants. High temperature stress decreased the photosynthetic rate(Pn),stomatal conductance(Gs)and transpiration rate(Tr)of all maize plants,but increased the intercellular CO2concentration(Ci). The Pn,gs and Tr of mycorrhizal maize leaves were higher than those of non-mycorrhizal plants,and the Ci of mycorrhizal plants was lower than that of non-mycorrhizal plants. Under high temperature stress,the primary fluorescence(Fo)was increased,and maximal fluorescence(Fm),variable fluorescence(Fv),maximum photochemical efficiency(Fv/Fm)and potential photochemical efficiency(Fv/Fo)were decreased regard-less of mycorrhizal and non-mycorrhizal maize plants. Compared with non-mycorhizal plants,mycorrhizal plants had higher Fv/Fm and Fv/Fo at all temperature conditions,but Fv and Fm were higher only at 40℃ condition. The re-sults showed that AM fungi is capable of alleviating the damage caused by high temperature stress on maize plants by means of improve leaf chlorophyll content,photosynthesis and chlorophyll fluorescence,and enhancing the high temperature tolerance ability of maize plants.

Key words: Arbuscular mycorrhiza, Chlorophyll fluorescence, High temperature stress, Maize, Photosynthesis

CLC Number:

S513. 03

CHEN Xiao-ying, SONG Feng-bin, ZHU Xian-can, LIU Sheng-qun, BAI Hui-zi,. Effect of Arbuscular Mycorrhizal Fungi on Photosynthetic Characteristics in Maize Plants under High Temperature Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2013, 28(2): 108-113. doi: 10.3969/j.issn.1000-7091.2013.02.020.

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