Optimizing Hybrid with Improved Resistance to Rice Blast and Superior Ratooning Ability

doi:10.1016/j.rsci.2025.04.015

摘要/Abstract

. [J]. Rice Science, 2025, 32(3): 292-297.

Fig. 1. Development of hybrid rice YLYH66 with enhanced blast resistance and strong regenerative capacity. A, Schematic representation of blast resistance enhancement strategy based on Chuanghui 911 (R911). MAS, Molecular marker-assisted selection. ♂ and ♀ represent male and female parents, respectively; K3, IRBLkh-K3. B, Polymorphism of molecular markers Pikh-up-4, Pikh-2, and Pikh-down-3 between donor K3 and recipient R911. C-E, Plant phenotypes (C), relative fungal biomass (D), and resistance index (E) of R911, H66-3, and T002 after inoculation with Magnaporthe oryzae isolates ROR1 and 17-2-9. F, Yield of R911, H66-3, and T002 in Changsha city, Hunan Province, China. G-I, Plant phenotypes (G), relative fungal biomass (H), and resistance index (I) of YLY911, YLYH66, OLYH66, and SLYH66 after inoculation with M. oryzae isolates ROR1 and 17-2-9. J-L, The ratios of ratoon to main effective panicle number per m2 (RA, J), the ratios of ratoon to main spikelet number per m2 (RMS, K), and the ratios of ratoon to main total dry weight (RMDW, L) across YLY911, YLYH66, OLYH66, and SLYH66. M-N, Correlations between RA and No. of main crop tillers per plant (M) and No. of ratoon crop tillers per plant (N). Scale bars in C and G are 1 cm. Data in E and I are evaluated using the standardized 0‒9 scale (International Rice Research Institute, 2002). Data are Mean ± SD (n = 4 in D, E, H, and I; 3 in F; 6 in J-L). P-values were calculated by one-way analysis of variance. The r values in M and N indicate Pearson correlation coefficients (n = 12), with P-values derived from Pearson’s bivariate correlation analysis. YLY911, YLYH66, OLYH66, and SLYH66 are hybrid combinations Y Liangyou 911, Y Liangyou H66-3, Yangliangyou H66-3, and Shuangliangyou H66-3, respectively.

Fig. 2. Agronomic traits of four combinations in main crop (MC) and ratoon crop (RC) seasons in Changsha and Yiyang cities, Hunan Province, China. A-I, Plant height (A), panicle number per m2 (B), spikelet number per m2 (C), spikelet number per panicle (D), grain filling rate (E), grain weight (F), total dry weight (TDW, G), harvest index (HI, H), and yield (I) of YLY911, YLYH66, OLYH66, and SLYH66 during MC season in Changsha and Yiyang. J-S, Plant height (J), panicle number per m2 (K), spikelet number per m2 (L), spikelet number per panicle (M), grain filling rate (N), grain weight (O), TDW (P), HI (Q), yield (R), and total yield (S) of YLY911, YLYH66, OLYH66, and SLYH66 during RC season in Changsha and Yiyang. Data are Mean ± SD (n = 6 in A-F and J-O; 3 in G-I and P-S). P-values were calculated by one-way analysis of variance. YLY911, YLYH66, OLYH66, and SLYH66 are hybrid combinations Y Liangyou 911, Y Liangyou H66-3, Yangliangyou H66-3, and Shuangliangyou H66-3, respectively.

参考文献 25

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