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| Screening for and evaluation of rice(Oryza sativa)varieties with low methane emission and high yield in South China |
| Received:January 22, 2018 |
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| KeyWord:rice variety;low methane emission;high yield;plant traits;evaluation index |
| Author Name | Affiliation | | HUANG Nong-rong | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | LIANG Kai-ming | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | ZHONG Xu-hua | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | PAN Jun-feng | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | LIU Yan-zhuo | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | PENG Bi-lin | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | FU You-qiang | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | HU Xiang-yu | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | TIAN Ka | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China | | KONG Qing-ni | Rice Research Institute of Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China |
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| Abstract: |
| Adopting rice varieties with high yield and low methane (CH4) emission is important for food security and environmental protection in China. However, the evaluation of such rice varieties with both high yield and low CH4 emission has rarely been documented. In the late season of 2013 and early season of 2014, pot experiments were carried out to evaluate the CH4 emission, grain yield, and agronomic traits of 50 rice varieties widely grown in South China. The CH4 fluxes of the rice varieties were determined via the static chamber/gas chromatograph technique. CH4 emission and grain yield displayed significant differences among the varieties. The amount of CH4 emission ranged between 7.37 and 21.10 g·m-2 throughout the growing period for the early-season rice and between 1.37 and 13.97 g·m-2 during the period from tillering to panicle differentiation for the late-season rice. The grain yield ranged between 0.40 and 0.65 kg·m-2 for the early-season rice and between 0.59 and 0.87 kg·m-2 for the late-season rice. According to cluster analysis, the tested rice varieties were divided into different groups based on grain yield and CH4 emission. Among the 50 varieties, Huanghuazhan, Wuyou308, Fenghuazhan, Tesanai, Molizhanxuan, Guangchaosimiao, Zhenguiai, Guanghui998, and Qiguizao25 were classified into the groups of high yield with low emission, high yield with moderate emission, or moderate yield with low emission. Furthermore, Huanghuazhan and Wuyou308 are the mega varieties in South China, whereas Guanghui998 is the restorer line for many hybrid rice varieties widely grown in South China. Correlation analysis indicated that the plant height and leaf area index were correlated significantly and positively with CH 4 emission. Thus, these two traits would be the important indices for screening varieties with high yield and low CH4 emission in rice breeding. Furthermore, there was an insignificant correlation between grain yield and CH4 emission, suggesting that it is possible to breed new varieties with both high yield and low CH4 emission. |
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