Abstract:
Objective The physiological and molecular responses of tea plants under different red/far-red light ratio ( R/FR ) light environments under low-temperature conditions were explored to provide theoretical guidance for winter light supplementation in factory light facilities.
Method ‘Guyuchun’ was used as the material, and far red light treatment (FR, R/FR = 4.1) and white light treatment (CK, R/FR = 10.4) were set up to study the effects of different R/FR ratio light environments on gas exchange parameters, fluorescence parameters, and the expression of phytochrome interaction factors (PIFs) of tea plants under low-temperature conditions (10 °C).
Result The transpiration rate (Tr), net photosynthetic rate (Pn), and electron transport rate (ETR) of tea leaves decreased. the proportion of non-regulated energy dissipation quantum yield Y (NO) increased, the proportion of actual quantum yield (YII) and regulated energy dissipation quantum yield Y (NPQ) decreased, and the important regulator of chlorophyll synthesis CsPIF3a gene was down-regulated.
Conclusion The low ratio of R: FR light environment under low temperature conditions weakens the photosynthetic electron transport capacity of tea leaves, inhibited the expression of chlorophyll synthesis related genes, reduces the photosynthetic capacity, and leaves are subjected to light damage.
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