Effects of Serendipita indica on drought resistance of banana seedlings
This study aimed to study the effects of Serendipita indica colonization on the growth characteristics of banana seedlings under drought stress and to reveal the physiological and biochemical mechanisms underlying these effects.The normally watered and under drought stress'Tianbaojiao'seedlings were treated with-and without-S.indica colonization,respectively.We compared the difference in phenotypes,growth indexes,the activity of superoxide dismutase(SOD),catalase(CAT),and peroxidase(POD),the malondialdehyde content(MDA),proline(Pro),soluble sugar(SS)in leaves and roots and the content of chlorophyll,abscisic acid(ABA)in leaves.The results showed that when the soil water content was suitable for the growth of banana seedlings,only the number of leaves and stem diameters of banana seedlings with S.indica colonization were significantly higher than those of the control group.There were no significant differences in other growth indexes between the two groups.Under drought stress treatment,the phenotypic variation of seedlings with S.indica colonization was less severe than those without S.indica colonization,and drought symptoms appeared later.The growth indexes of seedlings with S.indica colonization were all better than those without S.indica colonization.The number of roots with S.indica colonization was significantly more than those without S.indica colonization,about 2.19 times(P＜0.01).The catalase(CAT)activity in roots with S.indica colonization was 1.58 times that of those without colonization.The activity of peroxidase(POD),the malondialdehyde content(MDA),proline(Pro),soluble sugar(SS),abscisic acid(ABA),and chlorophyll in leaves of seedlings with S.indica colonization were 1.78 times,50.23％,1.61 times and 1.83 times that of those without colonization,respectively.These findings were all significant(P＜0.01).It was concluded that Serendipita indica could improve the drought resistance of bananas by improving the activity of POD in leaves and the activity of CAT in roots to degrade and remove harmful substances produced by severe drought stress.It also can reduce MDA accumulation in leaves and roots,promote the synthesis and accumulation of Pro and SS in leaves,slow down the decomposition of chlorophyll,and accelerate the synthesis and accumulation of ABA in leaves to enhance the drought resistance of bananas under drought stress.
drought stressSerendipita indicagrowthphysiological and biochemicalresistance to drought
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