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 ℃).
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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