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Acta Agron Sin ›› 2015, Vol. 41 ›› Issue (01): 89-99.doi: 10.3724/SP.J.1006.2015.00089


Root System Morphological and Physiological Characteristics of Indica-japonica Hybrid Rice of Yongyou Series

JIANG Yuan-Hua,XU Jun-Wei,ZHAO Ke,WEI Huan-He,SUN Jian-Jun,ZHANG Hong-Cheng*,DAI Qi-Gen,HUO Zhong-Yang,XU Ke,WEI Hai-Yan,GUO Bao-Wei   

  1. Innovation Center of Rice Cultivation Technology in the Yangtze Valley, Ministry of Agriculture / Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
  • Received:2014-04-18 Revised:2014-09-16 Online:2015-01-12 Published:2014-11-11
  • Contact: 张洪程, E-mail: hczhang@yzu.edu.cn, Tel: 0514-87979220 E-mail:447685778@qq.com

Abstract: A field experiment was conducted to compare the root system morphological and physiological characteristics of four types of rice populations including indica-japonica hybrid rice of Yongyou series (A), japonica hybrid rice (B), conventional japonica rice (C), and indica hybrid rice (D) under high-yielding cultivation condition in the rice-wheat cropping system. Results were as follows: (1) The root dry weight, aboveground dry weight, number of root tips, root length, root surface area, root-shoot ratio and root volume of A were obviously higher than those of B, C, and D at the middle and late growth stage. (2) The proportion of number, length, surface area and volume of the adventitious roots(root diameter > 0.3 mm) to the whole roots of A were higher than those of B and C, while lower than those of D at heading; the proportion of number, length, surface area and volume of the fine branches (root diameter ≤ 0.1 mm) and coarse branches (0.1 mm < root diameter ≤ 0.3 mm) to total roots of A were higher than those of D, while lower than those of B and C at heading. The proportions of root weight in 0–5 cm, 5–10 cm, and 10–15 cm soil layers to total roots weight of A were higher than those of B and C, while lower than those of D; however, the proportions of root weight in 15–25 cm, 25–35 cm, 35–45 cm, and 45–55 cm soil layers to the total root weight where lower than those of B and C, while higher than these of D at heading. (3) The total absorbing surface area, active absorbing surface area, bleeding intensity, root oxidation activity, and root reducing activity of A were higher than those of B, C, and D. Compared with B, C, and D, the indica-japonica hybrid rice of Yongyou series had significant advantage in root-shoot coordination level, root amount. branch structure, root distribution in soil and biological activity in the middle and late growth stage. This peculiarity of A provides an important guarantee to realize the super-high-yield.

Key words: Indica-japonica hybrid rice, Yongyou series, Morphology and physiology of roots

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