The effects of elevated CO2 concentration 700 ± 50mg/L,enhanced UV-B radiation 14.7kJ/(m2 · d)and the combined treatments [700 ± 50mg/L,14.7kJ/(m2 · d)] on yield and quality of Japanese japonica varieties Sasanishiki were observed in our study with an open climate chamber.The results showed that:(1) Elevated CO2 concentration significantly increased the yield per plant (21.78％),but had no significant influence on thousand grain weight,panicles per plant,grains per plant and seed setting rate.The yield and seed setting rate were decreased by 6.44％ 、6.13％、14.89％、14.79％ under enhanced UV-B radiation and the combined treatments.Meanwhile,the combined treatments significantly reduced thousand seed weight; (2) Elevated CO2 concentration and the combined treatments led to the decreases in the ratio of perfect kernel (29.54％-42.18％),and increases in ratio of broken kernel (29.73％-103.25％) and immature kernel (30.71％-176.36％).The broken kernel ratio and immature kernel ratio under enhanced UV-B stress were less than CO2 alone treatment and the combined treatments.(3) Enhanced UV-B radiation,elevated CO2 concentration and the combined treatments significantly increased fatty acid content (32.6％-76.29％) and protein content (5.3％-28.0％),while had no effect on water and amylopectin content.In conclusion,enhanced UV-B radiation significantly inhibit the yield,and elevated CO2 concentration significantly increased the yield,but in this experiment,elevated CO2 concentration did not alleviate the inhibition effect of enhanced UV-B radiation ; On the other hand,enhanced UV-B radiation,elevated CO2 concentration and the combined treatments all significantly changed the nutritional quality of this rice varieties.
Enhanced UV-B radiationElevated carbon dioxideRice(Oryza sativa L.)Yield and quality
NETL
NSTL
万方数据
维普
