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广西地方稻种资源核心种质的耐盐性鉴定评价
作者: 夏秀忠1  张宗琼1  杨行海1  农保选1  曾 宇2  刘开强2  
邓国富2
  荘 洁1  李丹婷1 *  
单位: (1 广西农业科学院 水稻研究所/广西水稻遗传育种重点实验室  南宁 530007;2 广西农业科学院  南宁 530007)  
关键词: 水稻  地方品种  核心种质  耐盐性  种质资源  广西  
分类号:S511
出版年,卷(期):页码:2017 ,48 ( 6 ): 页码:979-984
摘要:

【目的】筛选耐盐性强的优异栽培稻种质资源,为盐碱地的改良提供品种支持,也为耐盐育种、耐盐基因的挖掘提供理论依据。【方法】以419份广西水稻地方品种核心种质为试验材料,进行芽期和苗期的耐盐性鉴定评价,芽期鉴定采用1.5% NaCl溶液进行盐胁迫,以相对盐害率为耐盐评级指标;苗期鉴定采用沙培法,用0.5% NaCl溶液进行盐胁迫,以死叶率作为评级指标,以植株矮化率为参考指标。【结果】广西水稻芽期耐盐性等级为3.77级,芽期耐盐资源主要集中于1级和3级,占参试总数的62.53%;苗期耐盐性等级为7.15级,大部分资源耐盐主要集中于7级和9级,占参试总数的75.89%。在水稻不同类型耐盐性比较中,芽期平均耐盐性籼稻(3.64)高于粳稻(4.28),籼稻变异系数(69.12)大于粳稻(60.28);苗期平均耐盐性籼稻(6.91)高于粳稻(8.03),籼稻变异系数(30.21)大于粳稻(18.43);籼稻苗期鉴定株高矮化率(32.73)和变异系数(50.92)均小于粳稻株高矮化率(37.22)和变异系数(63.62);相关分析结果表明,籼稻(r=0.0667)和粳稻(r=-0.0531)的芽期和苗期耐盐等级均无显著相关(P>0.05)。对不同稻作区水稻耐盐性进行比较,广西桂南稻作区水稻的平均耐盐性在芽期(3.48)和苗期(6.97)为4个稻作区中最高。【结论】广西水稻地方品种资源芽期耐盐性强于苗期,籼稻耐盐性强于粳稻,以芽期1级和苗期1、3级进行耐盐种质筛选,获得杨村一号等12份优异耐盐种质资源,可作为耐盐育种的亲本选育及在耐盐基因挖掘中加以利用。

【Objective】Strong salt tolerant cultivated rice germplasm resources were screened in order to provide varieties for reclamation of saline and alkaline land, and offer reference for salt tolerant variety breeding and salt tolerant genes exploration. 【Method】Salt tolerance at germination stage and seedling stage of rice were identified using 419 rice core germplasm resources in Guangxi. At germination stage, salt stress was conducted with 1.5% NaCl solution and relative salt injury rate was used as evaluation index. At seedling stage, seedlings were cultured in sand and treated with 0.5% NaCl solution, with dead leaf rate as evaluation index and plant dwarfing rate as reference index. 【Result】In Guangxi, salt tolerance grade at rice germination stage was 3.77, and most rice germplasm resources were classified in grade 1 and 3, accounting for 62.53% of the total. Salt tolerance grade at rice seedling stage was 7.15, and most rice germplasm resources were classified in grade 7 and 9, which accounted for 75.89%. In comparison of salt tolerance for different rice landraces, at germination stage, average salt tolerance of indica(3.64) was higher than that of japonica(4.28), and the coefficient of variation of indica rice(69.12) was higher than japonica rice(60.28). At seedling stage, average salt tolerance of indica(6.91) was higher than that of japonica(8.03), and coefficient of variation of indica(30.21) was higher than that of japonica(18.43). At seedling stage, plant dwarfing rate(32.73) and coefficient of variation(50.92) of indica was less than those of japonica(plant dwarfing rate 37.22 and coefficient of variation 63.62).Correlation analysis showed that for both indica(r=0.0667) and japonica(r=0.0531), salt tolerance grades at germination stage and seeding stage were not significantly correlated(P>0.05). In terms of salt tolerance in different rice planting regions, the average salt tolerance at germination stage(3.48) and the seedling stage(6.97) in Guangxi southern region were the highest among four rice planting regions. 【Conclusion】Salt tolerance at germination stage of Guangxi rice landraces is higher than that at seedling stage. Salt tolerance of indica is stronger than japonica. Twelve salt tolerant rice germplasm resources including Yangcun 1 are selected out of seedlings with grade 1 salt tolerance at germination stage and grade 1 and 3 at seedling stage. These germplasm resources can be applied in salt tolerant parents breeding and salt tolerant genes exploration.

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