Hong Liang, Zhang Lei, Qian Senhe, Sun Xu, Cai Yongping, Lin Yi, Gao Junshan, Guo Ning
To investigate the effect of light quality on green cotton fiber development and flavonoid synthesis in the green cotton variety Lüxumian I, physiological and molecular indicators were measured as a materials, and the ovule fresh weight, fiber length, cellulose content, flavonoids content and other physiological and molecular indicators with red light, yellow light, blue light, white light, and dark growth conditions. All light conditions tested promote ovule fresh weight, while inhibiting fiber elongation. During early fiber development, all light conditions inhibit sucrose synthase activity and sucrose synthase SuSy gene expression. Only white light improves sucrose synthase activity and promotes SuSy expression at a later stage in fiber development. Red, yellow, and blue light significantly increased β-1,3-glucanase activity (10-20 Day after culture, DAC), while red, yellow, and white light improved β-1,3-glucanase gene expression. Only blue light suppressed expression at this locus. Cellulose synthesis is promoted by white light and inhibited by blue light. During early fiber development (10 DAC), blue light inhibits flavonoid synthesis and expression of key genes in this pathway. During late fiber development (30-40 DAC), white light promotes flavonoid synthesis and key gene expression. Thus, these finding suggest light quality has a certain influences on the fiber development and flavonoid synthesis of green cotton.
