Distribution Pattern of Free Proline in Rice (Oryza sativa L.) Grown under Low Light Irradiance

摘要

AbstractThe variation in free proline levels of two rice (Oryza sativaL.) cultivars grown under normal and low light intensities was studied. The aim of the present investigation was to find the distribution pattern of free proline in the whole plant. Free proline levels were determined in Flag leaves, culm and pollen grains, milky, dough and mature grains of Swarnaprabha (SP) and Ratna cultivars. The Flag leaf of Ratna had higher proline levels compared with (SP) under both light levels. Among the parts studied, pollen grains had the maximum free proline content in both the cultivars. Low light irradiance did not alter free proline levels of pollen grains in both the cultivars, indicating that proline could be important for the pollination process. Milky, dough and mature grains had lower proline levels under low light. The varietal, treatment and their interaction was not significant for mature grains of both low light tolerant ‘SP’ and standard Ratna Cultivars. It was indicated that low light stress is unique with regard to free prol