Abstract
Lentinan (LNT) is a natural and functional polysaccharide isolated from Lentinus edodes fruiting bodies, which functions in stimulating the plant immune response, improving plant disease resistance and regulating plant growth. This study explores the use of LNT as a plant growth regulator and attractant in cotton production. After treatment with LNT, the content of malondialdehyde (MDA) in cotton seeds decreased, whereas the activities of polyphenol oxidase (PPO), superoxide dismutase (SOD) and peroxidase (POD) in leaves increased significantly. LNT also promoted the growth and development of cotton plants and significantly reduced the incidence of cotton damping-off disease. The relative expression of salicylic acid pathway-related genes in cotton also increased significantly. The prevention mechanism of fluopimomide was also evaluated, and the result showed lower EC50 values and was effective in controlling cotton seedling disease caused by Rhizoctonia solani in both greenhouse experiments and field trials. The use of LNT and fluopimomide in controlling cotton seedling damping-off disease showed a synergistic effect in field trials. These results will provide a new insight into the agricultural application of LNT as a biological fungicide in the field of biological controls.
Highlights
Cotton (Gossypium hirsutum L.) is a natural fiber crop widely grown around the world [1,2]
Plants are constantly faced with several pathogenic agents and controlling this diseasecausing agent is crucial in the sustainable production of crops
We observed that LNT improved cotton seed germination rate and seedling growth, and induced the expression of some defense genes in plants, is a good immune elicitor
Summary
Cotton (Gossypium hirsutum L.) is a natural fiber crop widely grown around the world [1,2]. Cotton damping-off disease caused by Rhizoctonia solani, is an important soil-borne and seedling disease [3,4] which affects cotton production and agricultural economy [5]. Pathogenic isolates of this fungus can infect at least 188 kinds of higher plants, including vegetables, forest trees, cereals and ornamental plants [6]. Lentinan (LNT) is a new type of natural functional polysaccharide isolated from Lentinus edodes fruiting body that can reduce damage caused by oxygen free radicals to organelles and has a good inhibitory effect on plant diseases [9].
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