QTL Mapping for Heat Tolerance of Chalky Grain Rate of Oryza glaberrima Steud.

doi:10.16819/j.1001-7216.2020.9086

Chinese Journal OF Rice Science ›› 2020, Vol. 34 ›› Issue (2): 135-142.DOI: 10.16819/j.1001-7216.2020.9086

• Research Papers • Previous Articles Next Articles

QTL Mapping for Heat Tolerance of Chalky Grain Rate of Oryza glaberrima Steud.

Zhibin CAO¹, Yao LI², Bohong ZENG¹, Linghua MAO¹, Yaohui CAI¹, Xiaofeng WU^1,^*, Linfeng YUAN^1,^*

¹Laboratory of Rice National Engineering, Jiangxi Research and Development Center of Super Rice, Nanchang 330200, China
²Institute of Soil and Fertilizer & Resources and Environment, Jiangxi Academy of Agricultural Sciences/Key Laboratory of Crop Ecophysiology and Farming System for the Middle and Lower Reaches of the Yangtze River, Ministry of Agriculture, Nanchang 330200, China

Received:2019-07-26 Revised:2019-10-17 Online:2020-03-10 Published:2020-03-10
Contact: Xiaofeng WU, Linfeng YUAN
About author:
^#These authors contributed equally to this work

非洲栽培稻垩白粒率耐热性QTL的定位

曹志斌¹, 李瑶², 曾博虹¹, 毛凌华¹, 蔡耀辉¹, 吴晓峰^1,^*, 袁林峰^1,^*

¹江西省超级水稻研究发展中心/国家水稻工程实验室(南昌), 南昌 330200
²江西省农业科学院土壤肥料与资源环境研究所/农业部长江中下游作物生理生态与耕作重点实验室, 南昌 330200

通讯作者: 吴晓峰,袁林峰
作者简介:
^#共同第一作者
基金资助:
国家自然科学基金资助项目(31560382);江西省杰出青年科学基金资助项目(2018ACB21026);江西省自然科学基金资助项目(20151BAB214013;2017BAB204020);江西省现代农业科研协同创新专项(JXXTCXFY201902);国家重点研发计划资助项目(2017YFD0301601;2018YFD0301103);江西省重点研发计划资助项目(20171ACF60019)

Abstract

Abstract:

【Objective】The objective of the research is to identify a QTL for heat tolerance of chalky grain rate, so as to provide support for the appearance quality breeding and analysis of genetic mechanism of rice high temperature tolerance of chalky grain rate. 【Method】 We developed a chalky grain rate heat-tolerant CSIL(chromosomal segment introgression lines), CSIL05-2, by backcrossing and marker assisted selection with African cultivated rice acc. IRGC102309 (Oryza glaberrima Steud.) as donor parent and Asian cultivated rice R9311 (O. sativa L. subsp. indica Kato) as recipient parent. And a QTL for insensitity of heat tolerance of chalky grain rate on chromosome 5 was analyzed using secondary populations from CSIL05-2.【Results】In a BC₆F₂ segregation populations, the SSR marker RM1200 on chromosome 5 showed significant correlation with heat tolerance of chalky grain rate by single marker analysis（P=0.0005）. Using Cartographer 2.5 and the composite interval mapping with BC₆F₃ and BC₆F₄ populations, we further anchored the quantitative trait loci (QTL) associated with heat tolerance of chalky grain rate at filling stage to the same position within a 1.3 cM interval, which was designed as qHTCGR and explained 11.4% and 17.5% of the phenotypic variances, respectively. Using homozygous recombinants screened from BC₆F₄ populations, qHTCGR5 was also detected in a ~333.4 kb region between RM11633 and RM11642.【Conclusion】 The QTL controlling the heat tolerance of chalky grain rate qHTCGR5 is a novel QTL.

Key words: rice, chalky grain rate, heat tolerance, QTL, gene mapping

摘要：

【目的】本研究旨在定位一个稻米垩白粒率高温耐性QTL,为外观品质育种及解析垩白粒率高温耐性的遗传机制提供依据。【方法】以非洲栽培稻耐热品种IRGC102309(Oryza glaberrima Steud.)和籼稻品种R9311(O. sativa L. subsp. indica Kato.)为亲本构建的栽培稻种间染色体片段导入系CSIL05-23为材料构建次级分离群体,结合人工气候室模拟灌浆期高温胁迫处理,采用垩白粒率高温钝感值为评价指标,对非洲栽培稻垩白粒率高温耐性 QTL 进行检测。【结果】 在BC₆F₂分离群体,利用单标记分析,发现第5染色体上的SSR标记RM1200与垩白粒率耐热性状极显著正相关（P=0.0005）。进一步利用BC₆F₃和BC₆F₄分离群体,采用QTL Cartographer 2.5软件和复合区间作图法在水稻第5染色体上的SSR标记RM1200-RM5796区间重复检测到一个灌浆期垩白粒率耐热性QTL, 命名为qHTCGR5,分别解释11.4%和17.5%表型变异。根据BC₆F₄分离群体的纯合重组体表型分组,利用置换作图方法将目标QTL同样定位在SSR标记RM1200-RM5796之间,遗传图距为1.3 cM,物理图距约为333.4 kb。【结论】 控制垩白粒率耐热性的qHTCGR5是一个能够用于稻米外观品质育种的新QTL。

关键词: 水稻, 垩白粒率, 耐热性, 数量性状位点, 基因定位

CLC Number:

Zhibin CAO, Yao LI, Bohong ZENG, Linghua MAO, Yaohui CAI, Xiaofeng WU, Linfeng YUAN. QTL Mapping for Heat Tolerance of Chalky Grain Rate of Oryza glaberrima Steud.[J]. Chinese Journal OF Rice Science, 2020, 34(2): 135-142.

曹志斌, 李瑶, 曾博虹, 毛凌华, 蔡耀辉, 吴晓峰, 袁林峰. 非洲栽培稻垩白粒率耐热性QTL的定位[J]. 中国水稻科学, 2020, 34(2): 135-142.

Figures/Tables 5

Fig. 1. Comparison of heat tolerance of chalky grain rate of CSIL05-23 and R9311 in field and artificial climatic chambers. **Significant differences at 0.01 level, t-test.

Table 1 Phenotypic variation of insensitive value of heat tolerance of chalky grain rate in BC6F2, BC6F3 and BC6F4 population and their parents.

世代 Generation	供体亲本 Donor parent (IRGC102309)	受体亲本 Recipient parent (R9311)	群体Population
世代 Generation	供体亲本 Donor parent (IRGC102309)	受体亲本 Recipient parent (R9311)	平均 Mean	范围 Range	标准差 SD	峰度 Kurtosis	偏度 Skewness
BC₆F₂（n=200）	1.074	2.36	2.18	1.52-2.62	0.23	0.17	0.12
BC₆F₃（n=368）	1.054	2.23	2.11	1.48-2.68	0.31	0.23	0.32
BC₆F₄（n=430）	1.082	2.06	2.03	1.42-2.56	0.27	0.17	0.12

Fig. 2. Genetic linkage map and likelihood intervals for QTL associated with heat tolerance of chalky grain rate. The left and right bars and whiskers indicate 1 logarithm of the odds (LOD) and 2 LOD likelihood intervals from BC6F3 and BC6F4 populations, respectively.

Table 2 QTL analysis of heat tolerance of chalky grain rate in BC6F3 and BC6F4 populations.

性状 Character	群体 Population	区间 Interval	LOD	表型方差 Phenotypic variance/%	加性效应 Additive effect/%
垩白粒率高温钝感值IV	BC₆F₃	RM1200-RM5796	6.3	11.3	-5.9
垩白粒率高温钝感值IV	BC₆F₄	RM1200-RM5796	7.4	17.5	-11.8
高温胁迫下的垩白粒率X₁	BC₆F₃	RM1200-RM5796	5.9	9.5	-5.6
高温胁迫下的垩白粒率X₁	BC₆F₄	RM1200-RM5796	6.9	16.7	-12.5
正常温度条件下的垩白粒率X₂	BC₆F₃	RM1200-RM5796	6.2	12.6	-5.7
正常温度条件下的垩白粒率X₂	BC₆F₄	RM1200-RM5796	7.1	16.5	-11.2

Fig. 3. Mapping of qHTCGR5 by a substitution mapping strategy. Linkage map of the QTLs region produced with 380 BC6F3 plants. The number of recombinants between adjacent markers is indicated under the linkage map. Progeny testing of BC6F4 homozygous recombinants delimited the qHTCGR5 locus to the region between markers RM1200 and RM5796. The 90 recombinants were grouped into 14 groups based on genotypes. The numbers of recombinants in each group and phenotypic difference of each group from the controls CSIL05-23 and R9311 for mean insensitive value of heat tolerance of chalky grain rate are shown on the right. An “a” following the phenotypic value indicates that the mean phenotypic value of recombinant was not significantly different from that of R9311 at P < 0.05;a “b”indicates that the mean phenotypic value of recombinant was not significantly different from that of CSIL05-23 at P < 0.05.

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QTL Mapping for Heat Tolerance of Chalky Grain Rate of Oryza glaberrima Steud.

非洲栽培稻垩白粒率耐热性QTL的定位

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