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Journal of Integrative Agriculture  2017, Vol. 16 Issue (07): 1467-1473    DOI: 10.1016/S2095-3119(17)61667-8
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Erect panicle super rice varieties enhance yield by harvest index advantages in high nitrogen and density conditions
TANG Liang1, GAO Hong1, 2, Hirooka Yoshihiro3, Homma Koki3, Nakazaki Tetsuya3, LIU Tian-sheng1, Shiraiwa Tatsuhiko3, XU Zheng-jin1
1 Rice Research Institute, Shenyang Agricultural University/Key Laboratory of Northeast Rice Biology and Breeding, Ministry of Agriculture/Key Laboratory of Northern japonica Super Rice Breeding, Ministry of Education, Shenyang 110866, P.R.China
2 Liaoning Academy of Agricultural Sciences, Shenyang 110161, P.R.China
3 Laboratory of Plant Breeding, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
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Abstract     The erect panicle (Ep) type is an important characteristic for japonica super rice in Northeast China and plays a significant role in enhancing yield. The Ep type is considered to be a genetic ideotype resource to the japonica super rice group by virtue of its agronomic advantages such as grain number per panicle and biomass. This study addresses the effects of nitrogen and planting density conditions on yielding performance regarding panicle type (PT) using the recombinant inbred line (RIL) population derived from the cross between an Ep variety Liaogeng 5 and non-Ep variety Wanlun 422. The genetics underlying the Ep type proved to be robust not only for panicle-type optimization but also plant height, panicle length, flag leaf length and seed density. We also found that regardless of nitrogen and density, correlation between harvest index (HI) and plant height was not significant in Ep type whatever the nitrogen and density. The application of Ep type provides a potential strategy for yield improvement by increasing biomass through HI maintainable in rice.
Keywords:  super rice        erect panicle        harvest index        nitrogen, planting density  
Received: 24 January 2017   Accepted: 06 July 2017
Fund: 

This work was supported by the National Key Research and Development Program of China (2016YFD0300504) and the Cultivation Plan for Youth Agricultural Science and Technology Innovative Talents of Liaoning Province, China (2014046).

Corresponding Authors:  Correspondence Shiraiwa Tatsuhiko, E-mail: shiraiwa@kais.kyoto-u.ac.jp; XU Zheng-jin, E-mail: xuzhengjin@126.com    
About author:  TANG Liang, E-mail: tl_rice@126.com

Cite this article: 

TANG Liang, GAO Hong, Hirooka Yoshihiro, Homma Koki, Nakazaki Tetsuya, LIU Tian-sheng, Shiraiwa Tatsuhiko, XU Zheng-jin. 2017. Erect panicle super rice varieties enhance yield by harvest index advantages in high nitrogen and density conditions. Journal of Integrative Agriculture, 16(07): 1467-1473.

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