Author: Jiao De-mao, Ji Ben-hua, Tong Hong-yu and Li Zhuan-guo
J Integr Plant Biol 1994, 36 (3): 0-.
To elucidate genetic background of photoinhibition (PⅠ) in Indica-Japonica F1 hybrid rice (Oryza sativa L. ), reciprocal crosses were made among Indica rice 3037, Palghar, Minghui 75, NJ 11, Luweidao and Japonica rice 02428, LH 422, 029, YS 8072. Apparent photosynthesis, PS Ⅱ activity, binding amount of 14C-atrazine to thylakoid were determined as parameters for seeking the genetic nature of the photoinhibition revealed by the parents and Fl hybrids. The results suggested that Indica cultivars with few exceptions were usually more sensitive than Japonica cultivars. Degree of PⅠ in reciprocal Fl hybrids was much biased toward the value of their maternal cultivars, indicating a maternal inheritance which involved in the PSbA encoded D1 protein known to be related to the photoinhibitory PS Ⅱ damage and repairing. The sensitivity of photoinhibitory damage was also related to superoxide dismutase (SOD), an active oxygen scavenging enzyme encoded by the nuclear gene. Meanwhile, comparison of photoinhibition between Indica-Japonica Fl hybrid “3037/ 02428” and Indica Fl hybrid “Shanyou 63”, It was found that Indica-Japonica Fl hybrid appears to be a cultivar with tolerance of photoinhibition and more stable photosynthesis under photoinhibitory condition and weak-strong light shift in terms of above parameters. It was emphasized that photoinhibition of Indica-Japonica Fl hybrids usually varied depending upon the female mainly in the rice breeding .