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于2008年以日本粳稻品种Sasanishiki为研究材料,利用开放式气候室,以正常CO2浓度350±50mg/L和自然光照处理为对照,设置UV-B 14.7k J/(m2·d)、CO2700±50mg/L及CO2+UV-B复合3个处理,研究了CO2浓度升高及UV-B辐射增强对该品种水稻糙米产量及品质的影响。结果表明:(1)水稻单株产量CO2浓度升高处理增加21.78%,而千粒重、单株穗数、穗粒数及结实率无显著变化。结实率与单株产量UV-B辐射增强及复合处理分别降低6.44%、6.13%、14.89%、14.79%。千粒重复合处理降低5.28%。(2)CO2浓度升高及复合处理导致糙米的完整粒比率下降(29.54%~42.18%),断裂粒(29.73%~103.25%)和未成熟粒(30.71%~176.36%)的比率增加。UV-B胁迫下,未成熟粒比率增加幅度均小于CO2单独处理及复合处理。(3)UV-B辐射增强、CO2浓度升高及复合处理均显著增加脂肪酸含量(32.6%~76.29%)和蛋白质含量(5.3%~28.0%),而对水分和支链淀粉含量没有影响。综上所述,UV-B辐射增强显著抑制了水稻产量;CO2浓度升高显著增加水稻产量,但在本试验设计范围内,CO2浓度升高并未缓解UV-B辐射增强的抑制效应;UV-B辐射增强、CO2浓度升高及二者复合处理均显著改变了该品种稻米的营养品质。
In 2008, using Japanese japonica rice variety Sasanishiki as the research material, UV-B 14.7k J / (m2 · d) and CO2700 ± 50mg / L were set up in an open climate chamber under the normal CO2 concentration of 350 ± 50mg / 50mg / L and CO2 + UV-B complex treatments. The effects of elevated CO2 and enhanced UV-B radiation on the yield and quality of the rice brown rice were studied. The results showed that: (1) The increase of CO2 concentration per plant increased by 21.78%, but there was no significant change in 1000-grain weight, panicles per plant, grains per spike and seed setting rate. The seed setting rate was decreased by 6.44%, 6.13%, 14.89% and 14.79% respectively with UV-B radiation per plant and compound treatment. Thousand grain weight combined treatment decreased by 5.28%. (2) The increase of CO2 concentration and composite treatment resulted in the decrease of whole grain ratio of brown rice (29.54% -42.18%), the ratio of broken grain (29.73% ~ 103.25%) and immature grain (30.71% ~ 176.36%). UV-B stress, the rate of increase of immature grains were less than CO2 alone and compound treatment. (3) The increase of UV-B radiation, the increase of CO2 concentration and the compound treatment significantly increased the content of fatty acid (32.6% -76.29%) and the protein content (5.3% -28.0%), but had no effect on the content of water and amylopectin. In summary, the enhanced UV-B radiation significantly inhibited the yield of rice; the increase of CO2 concentration significantly increased the yield of rice, but in the experimental design range, the increase of CO2 concentration did not alleviate the inhibitory effect of enhanced UV-B radiation; UV -B radiation enhancement, elevated CO2 concentration and the combination of both significantly changed the nutritional quality of the rice varieties.