Growth Responses of Rice Seedlings to Light Wavelengths : II. Effect of light wavelength on chlorosis of seedlings

[摘要] This study deals with the effect of various light wavelengths on chlorosis of the leaves of rice seedlings treated with darkness in the promoting germination state and greened under high solar radiation of 529 and 550 cal·cm-2·day-1. 1. Under condition of 529 cal·cm-2·day-1 solar radiation in the greening stage, blue and green film inhibited chlorosis, while red and purple had no effect. 2. With higher transmission rate in the visible region and with lower B/R ratio of light, the degree of chlorosis was increased, but the chlorophyll content was decreased. 3. With high solar raditttion of 550 cal·cm-2·day-1, a significant positive correlation between the degree of chlorosis and the transmission rate of light in the 600-700 nm region was observed. 4. The transmission rates through a single layer of etiolated 1st leaf and of greened 2nd leaf sheath were 83% and 140%, respectively. The spectral transmission of both the etiolated 1st leaf of 600-700 nm light and the greened 2nd leaf sheath of 500-600 nm light were relatively high. The decrease of transmission rates rather than the changes of spectral transmissions in leaves seemed to contribute to the inhibition of chlorosis.

[学科分类] 农业科学（综合）