Vol.91, No.2, 2022, pp.429-437, doi:10.32604/phyton.2022.016955
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ARTICLE
Contrasting Characteristics of Lodging Resistance in Two Super-Rice Hybrids Differing in Harvest Index
  • Zui Tao1, Tao Lei1, Fangbo Cao1, Jiana Chen1, Xiaohong Yin1,2, Tianfeng Liang2,*, Min Huang1,*
1 Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
2 Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 530007, China
* Corresponding Authors: Tianfeng Liang. Email: ; Min Huang. Email:
Received 13 April 2021; Accepted 31 May 2021; Issue published 26 September 2021
Abstract
The “super rice” breeding program in China has been successful in developing high-yielding hybrids, including few with high harvest index values. However, there is limited information on the relationship between lodging resistance and harvest index, and the mechanisms underlying the relationship in super-rice hybrids. In this study, a two-year field experiment was conducted to compare lodging resistance and its related traits between two super-rice hybrids differing in harvest index, i.e., Guiliangyou 2 (G2) with a high harvest index and Y-liangyou 1 (Y1) with a typical harvest index of modern high-yielding rice varieties. Results showed that compared to Y1, G2 was lower in plant height due to its lower aboveground N uptake, and its higher stem breaking resistance (i.e., lower stem breaking index) resulted from a lower stem height at its center of gravity. Consequently, G2 had a higher lodging resistance (i.e., lower plant lodging index) than Y1. This study suggests that developing super-rice hybrids with high harvest index values is a possible way to achieve both high grain yield and strong lodging resistance in rice.
Keywords
Harvest index; nitrogen uptake; plant height; lodging resistance; stem breaking resistance; super-rice hybrid
Cite This Article
Tao, Z., Lei, T., Cao, F., Chen, J., Yin, X. et al. (2022). Contrasting Characteristics of Lodging Resistance in Two Super-Rice Hybrids Differing in Harvest Index. Phyton-International Journal of Experimental Botany, 91(2), 429–437.
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