Effects of Arbuscular Mycorrhizal Fungi on Physiological Index of Rose Cultivars under Drought Stress
To explore the tolerance mechanism of arbuscular mycorrhizal fungi(AMF)on rose cultivars to drought stress,pot experiment was conducted to study the effects of arbuscular mycorrhizal fungi on the activities of antioxidant enzymes and photosynthetic characteristics of rose cultivars under drought stress.The results showed that the mycorrhizal infection rate of three rose cultivars inoculated with Ri was over 47％under normal watering condition,and about 20％under drought stress.Drought stress inhibited the formation of mycorrhiza,but the leaf thickness and leaf mass per area,soluble protein content,SOD content and CAT content in AMF group were significantly increased compared with drought stress group,while MDA content was significantly decreased compared with drought stress group.The results showed that AMF inoculation increased the potential antioxidant capacity of rose;the photosynthetic capacity of the three rose cultivars was significantly reduced under drought stress.After inoculation with AMF,LSP and Pmax values of the three rose cultivars could be effectively increased,which was significantly different from non-AM fungal treatment.The stability of antioxidant system of the three rose cultivars was remarkably promoted,the osmotic balance was regulated,and photosynthetic capacity was improved under drought stress with AMF.AMF effectively alleviate the adverse effects of drought stress on the growth of three rose cultivars.
Arbuscular mycorrhizal fungiDrought stressAntioxidant enzymePhotosynthetic characteristicsRosa cultivars
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