Male Parent Plays More Important Role in Heat Tolerance in Three-Line Hybrid Rice

doi:10.1016/S1672-6308(14)60284-5

Abstract

Abstract:

Ten F₁ combinations with their male and female parents were employed to evaluate their heat tolerance during the flowering and early grain filling stages. The rice plants were subjected to heat stress (39 °C-43 °C) for 1-15 d during flowering. Based on the heat stress index, heat tolerance was only observed in the F₁ combinations H2 (K22A × R207), H3 (Bobai A × R207) and H4 (Bobai A × Minghui 63), whereas the others received above 0.5000 of heat stress index. Both parents of the tolerant combination (heat-tolerant × heat-tolerant) possessed heat tolerance, whereas the susceptible combinations were crossed by heat-tolerant (sterile lines) × heat-susceptible (restorer lines), heat-susceptible × heat-tolerant, or heat-susceptible × heat-susceptible parents. This result indicated that heat tolerance in rice was controlled by recessive genes. Thus, both parents should possess high temperature tolerance to develop heat-tolerant F₁ combinations. Furthermore, the heat stress index of F₁ combinations was significantly correlated with the heat stress index of restorer lines but not with the heat stress index of maintainer lines. This result suggested that male parents play a more important role in heat-tolerant combinations than female parents. Therefore, the heat susceptibility of the hybrid rice in China is mainly due to the wide application of low-heat-tolerant restorer lines with high yield in three-line hybrid rice breeding.

Key words: hybrid rice, genetic correlation analysis, heat stress, heat tolerance

Guan-fu Fu, Cai-xia Zhang, Yong-jie Yang, Jie Xiong, Xue-qin Yang, Xiu-fu Zhang, Qian-yu Jin, Long-xing Tao. Male Parent Plays More Important Role in Heat Tolerance in Three-Line Hybrid Rice[J]. Rice Science, 2015, 22(3): 116-122.

Figures/Tables 4

References 46

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Line	Variety	No. of panicle per plant		No. of grains per panicle		Seed-setting rate (%) (%)		1000-grain weight (g)		HSI
Line	Variety	Control	Heat stress	Control	Heat stress	Control	Heat stress	Control	Heat stress	HSI
Maintainer line	K22B	11.7 a	9.4 b	118.20 a	82.68 b	53.30 a	42.73 b	26.62 a	19.91 b	0.1984
	Bobai B	15.7 a	12.2 b	110.81 a	78.82 b	77.40 a	56.46 b	19.41 a	17.43 a	0.2705
	Neixiang 85B	13.0 a	8.2 b	146.15 a	117.39 b	68.51 a	19.18 b	28.51 a	17.19 b	0.72
	Zhong 9B	12.3 a	13.1 a	124.49 a	127.33 a	73.60 a	7.43 b	22.64 a	14.46 b	0.899
Restorer line	Minghui 63	13.0 a	13.7 a	73.26 a	86.49 b	76.23 a	39.76 b	29.58 a	20.76 b	0.4784
	R207	10.7 a	8.0 b	105.28 a	130.58 b	72.87 a	33.82 b	23.74 a	9.79 b	0.5359
	Chuannong 527	11.3 a	14.7 b	98.82 a	53.58 b	90.57 a	0.38 b	32.62 a	13.08 b	0.9958
	Milyang 46	12.0 a	15.7 b	75.64 a	63.21 a	78.77 a	5.82 b	28.21 a	16.24 b	0.9261

Line	Variety	No. of panicle per plant		No. of grains per panicle		Seed-setting rate (%) (%)		1000-grain weight (g)		HSI
Line	Variety	Control	Heat stress	Control	Heat stress	Control	Heat stress	Control	Heat stress	HSI
Maintainer line	K22B	11.7 a	9.4 b	118.20 a	82.68 b	53.30 a	42.73 b	26.62 a	19.91 b	0.1984
	Bobai B	15.7 a	12.2 b	110.81 a	78.82 b	77.40 a	56.46 b	19.41 a	17.43 a	0.2705
	Neixiang 85B	13.0 a	8.2 b	146.15 a	117.39 b	68.51 a	19.18 b	28.51 a	17.19 b	0.72
	Zhong 9B	12.3 a	13.1 a	124.49 a	127.33 a	73.60 a	7.43 b	22.64 a	14.46 b	0.899
Restorer line	Minghui 63	13.0 a	13.7 a	73.26 a	86.49 b	76.23 a	39.76 b	29.58 a	20.76 b	0.4784
	R207	10.7 a	8.0 b	105.28 a	130.58 b	72.87 a	33.82 b	23.74 a	9.79 b	0.5359
	Chuannong 527	11.3 a	14.7 b	98.82 a	53.58 b	90.57 a	0.38 b	32.62 a	13.08 b	0.9958
	Milyang 46	12.0 a	15.7 b	75.64 a	63.21 a	78.77 a	5.82 b	28.21 a	16.24 b	0.9261

Combination	No. of panicle per plant		No. of grains per panicle		1000-grain weight (g)		Seed-setting rate (%)		HSI
Combination	Control	Heat stress	Control	Heat stress	Control	Heat stress	Control	Heat stress	HSI
H1	14.3 a	14.5 a	147.0 a	146.8 a	26.65 a	24.80 b	75.1 a	37.4 b	0.5024
H2	14.5 b	16.3 a	119.4 a	117.7 a	22.75 a	22.30 a	83.8 a	74.9 b	0.1064
H3	21.0 a	18.1 b	172.2 a	161.5 b	25.15 a	24.65 b	74.7 a	67.8 b	0.0922
H4	14.0 a	14.6 a	143.7 b	165.7 a	20.65 a	19.75 b	71.8 a	59.9 b	0.1659
H5	16.4 a	15.8 a	167.0 a	129.0 b	29.65 a	26.35 b	58.4 a	14.9 b	0.7456
H6	10.6 a	11.3 a	162.2 a	145.4 b	29.60 a	30.20 a	66.1 a	26.2 b	0.6038
H7	11.8 a	9.3 b	150.5 a	124.5 b	27.70 a	28.45 a	76.4 a	14.8 b	0.8062
H8	14.4 a	13.1 a	130.2 a	128.7 a	26.25 a	26.45 a	62.1 a	21.9 b	0.6477
H9	12.8 a	6.6 b	156.6 a	158.8 a	24.35 a	24.65 a	65.0 a	26.4 b	0.5933
H10	13.9 a	8.1 b	150.9 a	142.5 a	25.85 a	24.65 b	52.2 a	18.0 b	0.6548

Combination	No. of panicle per plant		No. of grains per panicle		1000-grain weight (g)		Seed-setting rate (%)		HSI
Combination	Control	Heat stress	Control	Heat stress	Control	Heat stress	Control	Heat stress	HSI
H1	14.3 a	14.5 a	147.0 a	146.8 a	26.65 a	24.80 b	75.1 a	37.4 b	0.5024
H2	14.5 b	16.3 a	119.4 a	117.7 a	22.75 a	22.30 a	83.8 a	74.9 b	0.1064
H3	21.0 a	18.1 b	172.2 a	161.5 b	25.15 a	24.65 b	74.7 a	67.8 b	0.0922
H4	14.0 a	14.6 a	143.7 b	165.7 a	20.65 a	19.75 b	71.8 a	59.9 b	0.1659
H5	16.4 a	15.8 a	167.0 a	129.0 b	29.65 a	26.35 b	58.4 a	14.9 b	0.7456
H6	10.6 a	11.3 a	162.2 a	145.4 b	29.60 a	30.20 a	66.1 a	26.2 b	0.6038
H7	11.8 a	9.3 b	150.5 a	124.5 b	27.70 a	28.45 a	76.4 a	14.8 b	0.8062
H8	14.4 a	13.1 a	130.2 a	128.7 a	26.25 a	26.45 a	62.1 a	21.9 b	0.6477
H9	12.8 a	6.6 b	156.6 a	158.8 a	24.35 a	24.65 a	65.0 a	26.4 b	0.5933
H10	13.9 a	8.1 b	150.9 a	142.5 a	25.85 a	24.65 b	52.2 a	18.0 b	0.6548

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