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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (05): 850-858.doi: 10.3724/SP.J.1006.2014.00850


Morphology and Physiology of Roots and Their Relationships with Yield Formation in Super Rice

CHU Guang,LIU Jie,ZHANG Hao,YANG Jian-Chang*   

  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
  • Received:2013-11-26 Revised:2014-03-04 Online:2014-05-12 Published:2014-03-24
  • About author:杨建昌, E-mail: jcyang@yzu.edu.cn, Tel: 0514-87979317


Two super rice cultivars, Liangyoupeijiu (indica-inclined two-line hybrid) and Yangjing 4038 (japonica), and two high-yielding rice cultivars, Yangdao 6 (indica) and Yangfujing 8 (japonica), were grown in nutrient solution in 2011 and 2012. Changes in morphological and physiological traits of roots at different growth stages and their relationships with growth and development were investigated. The results showed that both super rice varieties had greater yield potential and higher grain yield than the two elite check varieties,which was mainly due to the larger sink from the larger panicle in the super rice varieties. Root and shoot dry weight was significantly greater in super rice varieties than in check ones throughout the growth season. Root oxidation activity (ROA), total root absorbing surface area, active absorbing surface area and root zeatin (Z) plus zeatin riboside (ZR) content, on a single plant basis, were significantly greater in super rice than in check varieties at the early stage. The low percentage of filled grains was closely associated with a quickly decreased root activity during grain filling. These results suggest that the yield of super rice varieties could be further increased by increasing seed setting rate through enhancing root activity during the grain filling period.

Key words: Super rice, Grain yield, Grain filling, Morphology and physiology of roots

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