Open Access

ARTICLE

Contrasting Characteristics of Lodging Resistance in Two Super-Rice Hybrids Differing in Harvest Index

by Zui Tao¹, Tao Lei¹, Fangbo Cao¹, Jiana Chen¹, Xiaohong Yin^1,2, Tianfeng Liang^2,*, Min Huang^1,*

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:

Phyton-International Journal of Experimental Botany 2022, 91(2), 429-437. https://doi.org/10.32604/phyton.2022.016955

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.

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Keywords

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