【摘要】 FACE(Free Air CO2 Enrichment,空气CO2浓度增加)设施使得实际地模拟未来植物生长所处的CO2浓度增加环境变为可能,FACE下,植物生长和产量发生不同程度的加速和提高,而了解水稻在灌浆期间碳水化合物的代谢对CO2浓度增加的响应认识,为今后合理筛选育种材料提供依据。利用FACE设施,研究了CO2浓度升高200μmol/mol对籼稻IR24灌浆期茎鞘中碳水化合物的积累及其运转以及产量构成的影响。结果表明:在整个灌浆期,籼稻IR24茎鞘中的非结构性碳水化合物(NSC)的积累在FACE下的均高于对照下的。而运转率表现不一致,在灌浆初期和后期,FACE下茎鞘中NSC的运转率低于对照下的,而灌浆中期的运转率则为FACE的高于对照下的。另外,FACE处理能显著提高籼稻IR24的产量。这些结果初步说明,FACE处理促进了茎鞘中NSC的积累及产量的增加,但在不同时期对运转的作用不同。更多还原

【Abstract】 FACE (free air carbon dioxide enrichment) technology is capable of providing a means by which the environment around growing plants may be modified to realistically simulate future concentrations of atmospheric CO2. The plant growth and yields in plant species can be enhanced under FACE. Identifying the response of metabolism of carbohydrate during grain filling to elevated CO2 will be useful for us to develop higher yield cultivars, adapting to future CO2 enriched at current CO2 concentration. The accumulation and transfer of carbohydrate during grain filling and yield of IR24 were studied under FACE. The results showed carbohydrate conten of stem under FACE was always higher than that under CK during grain filling, but the rate of carbohydrate transfer under FACE was lower than that of CK during 15d~30d. Additionly, FACE significantly increased yield compoments of IR24. The above results showed FACE enhanced yield and the accumulation of carbohydrate in stem of rice, but the transfer rate was different during grain filling.更多还原