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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (10): 1899-1908.doi: 10.3724/SP.J.1006.2013.01899

• RESEARCH NOTES • Previous Articles     Next Articles

Relationship between Root Morphological Characteristics and Yield Components of Major Commercial Indica Rice in South China

CHEN Da-Gang,ZHOU Xin-Qiao,LI Li-Jun,LIU Chuan-Guang,ZHANG Xu,CHEN You-Ding*   

  1. Rice Research Institute, Guangdong Academy of Agricultural Sciences / Guangdong Key Laboratory of New Technology in Rice Breeding / Guangzhou Branch of National Rice Improvement Center, Guangzhou 510640, China
  • Received:2013-01-29 Revised:2013-06-10 Online:2013-10-12 Published:2013-07-31
  • Contact: 陈友订, E-mail: chenyoud@21cn.com

Abstract:

Seven inbred and hybrid indica rice cultivars widely planted in recent years in South China were used in pot experiment in 2010–2011, and the root traits including root number, root length, root volume and root dry weight per plant, stem and single adventitious root were investigated at active tillering, heading and maturity stages, meanwhile, characteristics of root branching at heading stage was investigated by WinRhizo system. Furthermore, the correlation between root traits and yield was analyzed. Results were as follows: (1) The number of adventitious roots per plant (NARP), total length of adventitious roots per plant (TLRP), total length of adventitious roots per stem (TLRS) and length per adventitious root (LPAR) of the hybrid rice were significantly larger than those of the inbred rice at each stage. Volume of roots per plant (VRPP), volume of roots per stem (VRPS), dry weight of roots per plant (DWRP) and dry weight of roots per stem (DWRS) showed no significant difference between hybrid rice and inbred rice. However, the root quality such as volume per adventitious root (VPAR), dry weight per adventitious root (DWAR) and dry weight per unit length of root (DWPL) of inbred rice was better than that of hybrid rice. (2) The total surface area and volume of branched roots at heading stage were adventitious root > coarse branched root > fine branched root with significant difference. Total root length of hybrid rice was coarse branched roots > adventitious roots > fine branched roots, and that of inbred rice was adventitious roots > coarse branched roots > fine branched roots. Moreover, the total length of branched roots, total length, surface area, volume of coarse branched roots and fine branched roots of hybrid rice were very significantly higher than those of inbred rice. But the average root diameter of inbred rice was very significantly higher than that of hybrid rice. (3) The difference of root characteristics between hybrid rice and inbred rice was mainly come from number of adventitious roots per plant and root length, which was caused by the difference of tiller number and single root length between hybrid rice and inbred rice. (4) Twelve root traits showed a significantly positive correlation with yield per plant. Number of adventitious roots per plant (NARP) and total surface area of branched roots (SABR) were major factor influencing the yield. The results above provide some informations for genetic improvement of rice roots and super rice breeding and cultivation.

Key words: South China, Indica rice (Oryza sativa L.), Root traits, Yield, WinRhizo

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