基于SSSL群体的玉米穗下节间长QTL分析

doi:10.3724/SP.J.1006.2018.00522

Abstract

Abstract:

The under-ear internode length determines maize plant height and ear height, which are two agronomic traits associated with yield and lodging resistance. The lengths of the 7th, 8th, and 9th internode play a decisive role in ear height. Compared with other agronomic traits, there is little knowledge for genetic basis of under-ear internode length. Thus, exploring the genetic basis of internode length plays an important role in maize breeding. In this study, a set of 260 chromosome segment substitution lines (CSSLs), using Chang 7-2 as the donor parent and lx9801 as recipient parent, was constructed and used to map QTLs for the 7th, 8th, and 9th internode length and ear height at two-environments in two years. In total, 18, 23, and 17 QTLs were detected for the 7th, 8th, and 9th internode length, respectively. Among them, eight QTLs were simultaneously detected for the 7th, 8th, and 9th internode length. For ear height, 20 QTLs were detected, 12 (60%) of these 20 QTLs were found to co-localize to the 7th, 8th, and 9th internode length. The results indicated that length of the 7th, 8th, and 9th internode and ear height have same genetic basis. Furthermore, length of the 7th, 8th, and 9th internode are important components of ear height and also determining the plant height and ear height in maize.

Key words: maize, single segment substitution lines (SSSL), under-ear internode length, ear height, quantitative trait loci (QTL)

Hai-Ping GUO, Gao-Yang SUN, Xiao-Xiang ZHANG, Peng-Shuai YAN, Kun LIU, Hui-Ling XIE, Ji-Hua TANG, Dong DING, Wei-Hua LI. QTL Analysis of Under-ear Internode Length Based on SSSL Population[J].Acta Agronomica Sinica, 2018, 44(04): 522-532.

Figures/Tables 4

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性状 Trait	2012		2013
性状 Trait	浚县 Xunxian	长葛 Changge	浚县 Xunxian	长葛 Changge
第7节间长7th internode length	4.047^**	3.036^**	0.045^*	0.874^**
第8节间长8th internode length	0.626^**	2.145^**	2.443^**	2.991^**
第9节间长9th internode length	6.024^**	8.374^**	2.967^**	6.889^**
穗位高Ear height	1.171^**	2.609^*	2.369^*	2.085^**

年份 Year	性状 Trait	浚县 Xunxian				长葛 Changge
年份 Year	性状 Trait	第7节间长 7th IL	第8节间长 8th IL	第9节间长 9th IL	穗位高 EH	第7节间长 7th IL	第8节间长 8th IL	第9节间长 9th IL	穗位高 EH
2012	第7节间长7th IL	1				1
	第8节间长8th IL	0.760^**	1			0.633^**	1
	第9节间长9th IL	0.597^**	0.635^**	1		0.558^**	0.538^**	1
	穗位高EH	0.432^**	0.455^**	0.439^**	1	0.415^**	0.443^**	0.431^**	1
2013	第7节间长7th IL	1				1
	第8节间长8th IL	0.684^**	1			0.645^**	1
	第9节间长9th IL	0.680^**	0.677^**	1		0.364^**	0.482^**	1
	穗位高EH	0.398^**	0.417^**	0.403^**	1	0.386^**	0.412^**	0.393^**	1

QTL Analysis of Under-ear Internode Length Based on SSSL Population

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