Abstract
Chitosan oligosaccharides (COS) has been abundantly studied for its application on regulating plant growth of many horticultural and agricultural crops. We presented here the effect of COS on tea plant growth and yield by physiological and transcriptomic checking. The results showed that COS treatment can enhance the antioxidant activity of superoxide dismutase (SOD) and peroxidase (POD) and increase the content of chlorophyll and soluble sugar in tea plants. The field trail results show that COS treatment can increase tea buds’ density by 13.81–23.16%, the weight of 100 buds by 15.94–18.15%, and the yield by 14.22–21.08%. Transcriptome analysis found 5409 COS-responsive differentially expressed genes (DEGs), including 3149 up-regulated and 2260 down-regulated genes, and concluded the possible metabolism pathway that responsible for COS promoting tea plant growth. Our results provided fundamental information for better understanding the molecular mechanisms for COS’s acting on tea plant growth and yield promotion and offer academic support for its practical application in tea plant.
Highlights
Way, including 25 up-regulated and 1 down-regulated (Table S6). These results indicated that Chitosan oligosaccharides (COS) treatment had complex effects on the biological process of tea plants
We revealed that COS treatment can promote tea plant growth and production, with tea buds’ density increased by 13.81–23.16% (Figure 2) and the 100-bud-weight increased by
Our study revealed that COS can promote the growth of tea plant and improve the yield of tea production by regulating physiological function like accumulating antioxidant enzyme activities, chlorophyll content and soluble sugar content
Summary
We conducted the field test at three tea gardens in Meitan, Ziyun and Pingtang in Guizhou Province, China, at geographical coordinates of 106–107 degrees north (N) and. 26–28 degrees east (E) with an altitude of 1100 m and an average annual temperature of. The tested tea plants were around 13 years old, and the cultivar was Camellia sinensis var. In March 2019 (before tea germination), 5% COS agent Zhengye Zhongnong High-tech Co., Ltd., Haikou, China) was applied on tea plant in accordance with the provisions of the ratio of dilution of the instructions. Every 40 mL commercial agent was 800 times diluted in volume with water consumption 32 kg/667 m2. The spraying was conducted once every five days and total three times in 15 days
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