Research Papers

Evaluation of Dynamic Plant Type and Radiation Use Efficiency of indica Hybrid Rice Restorer Lines

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  • Rice Research Institute, Guangdong Academy of Agricultural Sciences / Guangdong Key Laboratory of New Technology for Rice Breeding, Guangzhou 510640, China

#These authors contributed equally to this work

*Corresponding author, E-mail: fwang1631@163.com

Received date: 2020-02-24

  Revised date: 2020-09-27

  Online published: 2021-03-10

Abstract

【Objective】A restorer (R) line with ideal dynamic plant type (DPT) is the premise of hybrid rice breeding with high and stable yield. The purpose of this study is to evaluate the DPT and radiation use efficiency (RUE) of the R lines bred in different periods, and investigate the characteristics of ideal DPT for efficient utilization of light energy, and lay a theoretical basis for breeding of high-yielding hybrid rice with high RUE. 【Method】A field experiment was conducted under the ecological conditions of South China with eight widely and commercially used R lines of indica hybrid rice Minghui 63, Minghui 82, Shuhui 527, Guanghui 998, Guanghui 308, Guanghui 128, Guanghui 122 and Gui 99 as material. The dynamic changes of tiller number, leaf area index (LAI), light transmittance of the population, leaf size, leaf angle and leaf color (SPAD value), as well as the photosynthetic rate in the heading stage, heading date, yield related traits and RUE were measured. 【Result】There existed significant difference in dynamic changes of plant type, yield and RUE among the restorer lines. Ideal DPT was closely related to RUE. With the most ideal DPT under the ecological conditions of South China, Guanghui 998, Guanghui 308 and Minghui 82 had the highest RUE. According to the cluster analysis, Guanghui 998, Guanghui 308 and Minghui 82 were classified into ClusterⅠwith high RUE, and the other five restorers fallen into ClusterⅡ. Finally, based on the ecological conditions in South China, an ideal DPT model of rice for efficient utilization of light energy was proposed. And the key indicators of breeding and selection were as follows: a) The tiller number and leaf area increased rapidly after transplanting; it cost less than 27 d to make LAI≥1.0, and less than 38 d to peak tiller number with moderate tillering ability, and the highest tiller number less than 600/m2 ; b) Narrow, droopy and long leaves in the early stage. On 15 days after transplanting, the average length, width and opening angle of the top three complete leaves were about 37 cm, ≤0.9 cm and ≥80°, respectively; narrow and straight leaf in late stage; on the 20th day after heading, the average opening angle, length and width of the top three leaves were ≤65°, 43 cm and ≤1.3 cm, respectively, belonging to medium sized leaf type. c) In the late stage, the leaf color turned from green to orange or yellowish gradually without premature senescence. The SPAD values ranged from 35 to 40, the decrease of SPAD value between 20 days before heading and 20 days after heading was less than 13%; the average number of grains per panicle was about 180 with the number of effective panicles more than 300 / m2 and seed setting rate≥85%. 【Conclusion】Guanghui 998 and Guanghui 308 have better DPT and higher RUE. The hybrid rice Tianyou 998, Boyou 998 and Wuyou 308 derived from these restor lines, have become the leading rice varieties for many years in southern China. Breeding hybrid rice with high and stable yield through the developing of R lines with ideal DPT and high RUE is an effective and important way.

Cite this article

Feng WANG, Yilong LIAO, Wuge LIU, Diling LIU, Xueqing ZENG, Youqiang FU, Manshan ZHU, Jinhua LI, Chongyun FU, Xiaozhi MA, Xing HUO . Evaluation of Dynamic Plant Type and Radiation Use Efficiency of indica Hybrid Rice Restorer Lines[J]. Chinese Journal OF Rice Science, 2021 , 35(2) : 141 -154 . DOI: 10.16819/j.1001-7216.2021.0207

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