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依托独特的稻田臭氧FACE(Free air gas concentration enrichment,开放式空气中气体浓度增高)系统平台,以武运粳21为供试水稻品种,设置正常浓度O3(即大气背景浓度)和高浓度O3(实际比大气背景浓度增高25%左右),定量研究地表O3浓度升高对粳稻抗倒能力的影响。结果表明:高浓度O3对水稻抽穗期和抽穗后20 d基部节间的抗折力和弯曲力矩没有显著影响,但使成熟期基部节间的抗折力和弯曲力距有所降低。因此,臭氧胁迫下水稻抽穗期、抽穗后20 d和成熟期基部节间的倒伏指数均无显著变化。进一步研究结果表明,臭氧胁迫下水稻成熟期基部节间单位长度干重和非结构性碳水化合物含量降低引起基部节间充实不良是造成抗折力显著下降的主要原因,而基部节间弯曲力矩下降是稻穗和节间的长度和质量下降共同作用的结果。以上结果表明,未来高浓度臭氧环境条件下粳型水稻的倒伏风险可能不会增加。
Relying on the unique FACE (Free air gas concentration enrichment) system platform, Wuyunjing 21 was used as the tested rice variety, and the normal O3 concentration (atmospheric background concentration) and high concentration O3 The actual background concentration increased by about 25% than the atmosphere) to quantitatively study the effect of elevated O3 concentration on the lodging resistance of japonica rice. The results showed that high concentration of O3 had no significant effect on the bending resistance and bending moment of the basal internodes at heading and 20 days after heading. However, the bending strength and the bending moment of the basal internodes decreased at the mature stage. Therefore, there was no significant change in heading index, lodging index at 20 d after heading and basal internode at maturity under ozone stress. Further studies showed that under ozone stress, the shortening of basal internode dysfunction due to the decrease of unit length dry weight and non-structural carbohydrate content in basal intima of rice at maturity was the main reason for the significant decrease of bending resistance, while the bending moment at basal intima decreased It is the result of the combined effect of the length and quality of rice panicles and internodes. The above results show that the lodging risk of japonica rice may not increase under high ozone concentration in the future.