不同荫蔽度下种植香荚兰的光合作用和生长发育

PHOTOSYNTHESIS,GROWTH AND DEVELOPMENT IN VANILLA FRAGRANS CULTIVATED IN DIFFERENT SHADE DENSITIES

In order to study the physiological effects of shade plant Vanilla fragrans (Salisb. ) Ames. on different light densities. Gas exchange and chlorophyll content of leaves and vegetalive and reproductional growth in Vanilla fragrans cultivated in different shade densities were measured and compared. Main results are concluded as follows: (1) The young leaves express marked CO2 release from respiration in the 90% shade density. In 30% shade density, both of young and mature leaves show photosynthesis inhibition for different levels; (2) The leaf photosynthesis carbon gain in 50% shade density is the highest. Followings are 30%, 70%and 90% shade density respectively; (3) The plant vegetative growth potential decreases with the shade density increases, and the values in 30% and 50% shade densities are very similar; (4) Numbers of flower and bean pod decrease with the shade desity increases, but the average bean weight and length in 50% and 70% shade densities are superior.