Heat-Tolerance Rice Varieties from National Regional Trial in Upper Reaches of Yangtze River: Identification and Evaluation

doi:10.11924/j.issn.1000-6850.casb2023-0196

Abstract

Abstract:

For better reducing the impact of global climate change on rice production, the heat-tolerance of 476 national rice varieties in the upper reaches of the Yangtze River from 2020 to 2022 had been identified and evaluated under both natural field and greenhouse conditions in this study. The results showed that tested varieties had generally good heat-tolerance at flowering stage, with 67, 324, 49, 30 and 6 varieties reaching grade 1, 3, 5, 7 and 9, accounting for 14.1%, 68.1%, 10.3%, 6.3% and 1.3% respectively. The overall heat-tolerance performance of tested varieties in different years was as follows: 2021>2020>2022. The overall heat-tolerance performance of different types of rice varieties showed as follows: two-line hybrid rice>three-line hybrid rice>conventional rice. The overall heat-tolerance performance of varieties from different trial channels showed as follows: green-channel trial>national unified trial>alliance trial. The 391 varieties with stronger or strong heat tolerance identified in this experiment can be preferentially promoted and applied in the heat-damaged frequent areas of the upper reaches of the Yangtze River, on the premise of taking the yield, quality and disease resistance into account. For 49 varieties with general heat tolerance, the planting areas of them should be limited strictly during the approval and promotion to avoid planting in areas with frequent heat damage, and 36 varieties with weak or weaker heat tolerance are recommended to be particularly cautious in the approval.

Key words: middle-season rice, high temperature, comprehensive heat-tolerant coefficient, variety approval, germplasm resource

YANG Shuai, ZHANG Zhengfeng, ZHANG Fangyu, WAN Xing, LIU Yi, XIAO Benze. Heat-Tolerance Rice Varieties from National Regional Trial in Upper Reaches of Yangtze River: Identification and Evaluation[J]. Chinese Agricultural Science Bulletin, 2024, 40(15): 1-8.

Figures/Tables 9

References 27

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年度	材料数量	耐热性级别
年度	材料数量	1级	3级	5级	7级	9级
2020	各级别材料数	35	109	20	7	1
2020	占比/%	20.35	63.37	11.63	4.07	0.58
2021	各级别材料数	18	111	9	4	0
2021	占比/%	12.68	78.17	6.34	2.82	0.00
2022	各级别材料数	14	104	20	19	5
2022	占比/%	8.64	64.20	12.35	11.73	3.09

年度	材料数量	耐热性级别
年度	材料数量	1级	3级	5级	7级	9级
2020	各级别材料数	35	109	20	7	1
2020	占比/%	20.35	63.37	11.63	4.07	0.58
2021	各级别材料数	18	111	9	4	0
2021	占比/%	12.68	78.17	6.34	2.82	0.00
2022	各级别材料数	14	104	20	19	5
2022	占比/%	8.64	64.20	12.35	11.73	3.09

品种类型	材料数量	耐热性级别
品种类型	材料数量	1级	3级	5级	7级	9级
常规稻	各级别材料数	0	4	1	1	0
常规稻	占比/%	0.00	66.67	16.67	16.67	0.00
两系杂交稻	各级别材料数	25	72	12	4	2
两系杂交稻	占比/%	21.74	62.61	10.43	3.48	1.74
三系杂交稻	各级别材料数	42	248	36	25	4
三系杂交稻	占比/%	11.83	69.86	10.14	7.04	1.13

品种类型	材料数量	耐热性级别
品种类型	材料数量	1级	3级	5级	7级	9级
常规稻	各级别材料数	0	4	1	1	0
常规稻	占比/%	0.00	66.67	16.67	16.67	0.00
两系杂交稻	各级别材料数	25	72	12	4	2
两系杂交稻	占比/%	21.74	62.61	10.43	3.48	1.74
三系杂交稻	各级别材料数	42	248	36	25	4
三系杂交稻	占比/%	11.83	69.86	10.14	7.04	1.13

试验渠道	材料数量	耐热性级别
试验渠道	材料数量	1级	3级	5级	7级	9级
国家统一试验	各级别材料数	5	26	3	1	1
国家统一试验	占比/%	13.89	72.22	8.33	2.78	2.78
绿色通道试验	各级别材料数	20	98	10	5	0
绿色通道试验	占比/%	15.04	73.68	7.52	3.76	0.00
联合体试验	各级别材料数	42	200	36	24	5
联合体试验	占比/%	13.68	65.15	11.73	7.82	1.63