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Abstract
Cold stress caused by a low temperature is a significant threat to tea production. The application of chitosan oligosaccharide (COS) can alleviate the effect of low temperature stress on tea plants. However, how COS affects the cold stress signaling in tea plants is still unclear. In this study, we investigated the level of physiological indicators in tea leaves treated with COS, and then the molecular response to the cold stress of tea leaves treated with COS was analyzed by transcriptomics with RNA-Sequencing (RNA-Seq). The results show that the activity of superoxide dismutase (SOD) activity, peroxidase (POD) activity, content of chlorophyll and soluble sugar in tea leaves in COS-treated tea plant were significantly increased and that photosynthesis and carbon metabolism were enriched. Besides, our results suggest that COS may impact to the cold stress signaling via enhancing the photosynthesis and carbon process. Our research provides valuable information for the mechanisms of COS application in tea plants under cold stress.
Highlights
The tea plant (Camellia sinensis (L.) O
To analyze the effects of chitosan oligosaccharide (COS) on tea plant growth, we measured the change in activity of superoxide dismutase (SOD), and POD enzymes and content of chlorophyll, soluble sugar in COS-treated tea plant and their respond to low temperature stress, with sterile distilled water served as control
The results show that cold stress consistently increased SOD and POD activity, and soluble sugar content, when the temperature was switched from 25 ◦ C to −4 ◦ C or −8 ◦ C, but POD activity was highest at −4 ◦ C
Summary
The tea plant (Camellia sinensis (L.) O. Especially in Zhejiang, Hubei and Guizhou provinces, which exhibits periodic albinism during the development of young shoots [3,4] It is rare and represent precious tea germplasm because of it special flavor, and has high levels of total amino acids and low levels of polyphenols, which differs from conventional tea [3,4,5,6,7,8]. It has a higher commercial value than green tea [4]
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