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首页> 外文期刊>The Science of the Total Environment >Elevated CO_2 improves lodging resistance of rice by changing physicochemical properties of the basal internodes
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Elevated CO_2 improves lodging resistance of rice by changing physicochemical properties of the basal internodes

机译：升高的CO_2通过改变基节间的理化特性提高水稻的抗倒伏性

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摘要

Elevated atmospheric CO2 concentration has been shown to increase rice yield but its effect on plant lodging resistance is still under debate. In this study, we examined lodging incidence in the field and lodging-related traits of two rice cultivarswith contrasting lodging susceptibility under ambient and elevated CO2 (ca. 200 mu mol mol(-1) above ambient) concentrations by using a free-air CO2 enrichment (FACE) system. Elevated CO2 (E-CO2) increased lodging resistance as shown by reduced visual lodging incidence in the field at the late grain filling stage in E-CO2 plots. This coincided with enhanced in situ pushing resistance of intact plants one week before lodging occurred. The positive CO2 effect was more pronounced in the lodging-susceptible cultivar LY084. In contrast, the cultivar WYJ23 displayed greater pushing resistance in the field, and no lodging occurred at either ambient or elevated CO2 conditions through out the cropping season. The field observations were consistent with the physicochemical characterization of basal internodes of rice plants at the grain filling stage. Greater lodging resistance of WYJ23 was mainly attributed to its shorter plant height and thicker culm wall of basal internodes. The improvement of lodging resistance by E-CO2 for the lodging-susceptible cultivar LY084 was mainly related to enhanced culm density, which was explained by elevated starch deposition in the stem. Less lodging incidence under elevated CO2 contributed to an increase in grain yield by 36% for LY084. In conclusion, rice production could benefit from elevated CO2 in a changing climate because of an increase in lodging resistance as a result of CO2-induced improvements in mechanical strength of basal internodes. (c) 2018 Elsevier B.V. All rights reserved.
机译：大气CO2浓度升高已显示可增加水稻产量，但其对植物抗倒伏性的影响仍在争论中。在这项研究中，我们研究了两种水稻品种在田间的倒伏发生率和与倒伏相关的性状，在大气和升高的CO2（比周围环境高200μmolmol（-1））浓度下使用自由空气CO2形成了相反的倒伏敏感性。浓缩（FACE）系统。较高的CO2（E-CO2）增加了抗倒伏性，如在E-CO2地块中后期灌浆阶段的田间视觉倒伏发生率降低所表明的。这与倒伏发生前一周完整植株的原位抗性增强有关。在倒伏易感品种LY084中，CO2的正效应更为明显。相反，WYJ23品种在田间表现出更大的抗推性，在整个种植季节中，无论是在环境条件下还是在升高的CO2条件下都不会发生倒伏。实地观察与水稻灌浆期基节间的理化特性一致。 WYJ23的较高抗倒伏性主要归因于其株高较短和基节间茎壁较厚。 E-CO2对倒伏敏感品种LY084的倒伏阻力的改善主要与茎秆密度的增加有关，这可以通过茎中淀粉沉积增加来解释。在较高的二氧化碳浓度下，LY084的倒伏发生率降低，导致谷物单产提高了36％。总之，由于CO2诱导的基础节间机械强度的提高，抗倒伏性增加，因此水稻在气候变化的情况下可因CO2浓度升高而受益。 （c）2018 Elsevier B.V.保留所有权利。

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