Photosynthetic units and carbon assimilation in leaves of grain Sorghum under different light intensities

The Cyt f and P700 contents in leaves of three Sorghum, varieties were measured, in relation to their carbon assimilation, under different light intensities during growth. At the maximum irradiation used (1,800 μ E m-2 s-1) the ratio of P700 to Cyt f was close to unity, whereas under low irradiation (450 μ E m-2 s-1) the ratio of P700 to Cyt f ranged from two to three. A strikingly positive correlation existed between the P700 contents of the leaves and their rates of carbon dioxide fixation, dry matter production and Cyt f contents, only when the plants were grown under high light intensities. The P700 content of the leaves in plants grown under low irradiation was unrelated to the contents of Cyt f. Thus, at a high light intensity there is a close relationship between the Cyt f and P700 levels, but at low intensities the amounts of electron carriers and the reaction centre are independent

Character association in paprika (Capsicum annuum/i L.)1

Correlation studies conducted in 94 diverse genotypes of paprika (Capsicum annuum) grown at Lam (Andhra Pradesh) indicated that dry fruit yield plant-1 showed significant and positive association with plant height, plant spread, number of fruits plant-1, fruit girth, seeds fruit-1 and capsanthin content. Path coefficient studies revealed that number of fruits plant-1 had the highest positive direct effect on dry fruit yield plant-1. Number of fruits plant-1, plant height, plant spread, number of seeds fruit-1, days to maturity and capsanthin content (in the given order) were important yield and quality components having direct bearing on dry fruit yield and hence can be considered while breeding for improved yield in paprika