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Research on Crops
Year : 2016, Volume : 17, Issue : 4
First page : ( 647) Last page : ( 651)
Print ISSN : 0972-3226. Online ISSN : 2348-7542.
Article DOI : 10.5958/2348-7542.2016.00108.X

Exogenous application of cytokinins improves grain filling of rice (Oryza sativa L.) in saline-alkaline paddy field

Xiao-Wei Li1,,2,,#, Bing-Sheng Lv1,,3,,#, Hao-Yu Yang1,,3, Li-Xing Wei1,,3, Hong-Yuan Ma1,,3, Ming-Ming Wang1,,3, Rui-Fang Yang4, Zhong-Ze Piao4, Chang-Jie Jiang1,,5,,*, Zheng-Wei Liang1,,3,,**

1North-east Institute of Geography and Agroecology Chinese Academy of Sciences-130102, Changchun, China

2College of Life Sciences, Jilin Agricultural University-130118, Changchun, China

3Da′an Sodic Land Experiment Station-131317, Da′an, China

4Crop Breeding and Cultivation Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, China

5Disease Resistant Crop Research Unit, National Institute of Agrobiological Sciences, Kannondai 2-1-2, 305–8602, Tsukuba, Japan

*e-mail: cjjiang@affrc.go.jp

**liangzw@iga.ac.cn

#First two authors contributed equally to this study

Online published on 31 January, 2017.

Abstract

Grain filling of rice is severely reduced under saline-alkaline conditions, resulting in loss of both grain yield and quality. Here we studied the potential improving effect of cytokinins (CKs) on grain filling of rice (Oryza sativa L.) in saline-alkaline paddy fields in the years of 2012 and 2013. The results showed that application of kinetin (KT, a synthetic CK; 10, 50 and 100 μM) to panicles significantly improved grain filling as shown by increase in 1,000-grain weight by 12.53% compared with the mock control treatment. Further, studies using opposite-paired primary rachis branches revealed that KT-application (50 μM) significantly accelerated the grain filling rate in both 2012 and 2013, and also increased the final 1,000-grain weight by 7.74% in 2013. These results demonstrate that CKapplication can significantly improve grain filling, and thus may provide a new approach to increasing grain yield and quality of rice in saline alkaline paddy field.

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Keywords

Cytokinins, grain filling, grain weight, rice, saline-alkaline soil.

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