TY  - EJOU
AU  - Tao, Zui 
AU  - Lei, Tao 
AU  - Cao, Fangbo 
AU  - Chen, Jiana 
AU  - Yin, Xiaohong 
AU  - Liang, Tianfeng 
AU  - Huang, Min 

TI  - Contrasting Characteristics of Lodging Resistance in Two Super-Rice Hybrids Differing in Harvest Index
T2  - Phyton-International Journal of Experimental Botany

PY  - 2022
VL  - 91
IS  - 2
SN  - 1851-5657

AB  - 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.
KW  - Harvest index; nitrogen uptake; plant height; lodging resistance; stem breaking resistance; super-rice hybrid

DO  - 10.32604/phyton.2022.016955