不同氮水平下玉米苗期生长性状及成熟期产量的QTL定位

doi:10.3864/j.issn.0578-1752.2009.10.005

Scientia Agricultura Sinica ›› 2009, Vol. 42 ›› Issue (10): 3413-3420 .doi: 10.3864/j.issn.0578-1752.2009.10.005

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles Next Articles

QTL Mapping of Seedling Growth Traits and Grain Yield Under Two Nitrogen Conditions in Maize

LIU Jian-chao, LI Jian-sheng, MI Guo-hua, CHEN Fan-jun, ZHANG Fu-suo

（中国农业大学资源与环境学院/农业部植物营养学重点实验室/教育部植物－土壤相互作用重点实验室）

Received:2008-10-21 Revised:2009-07-08 Online:2009-10-10 Published:2009-10-10
Contact: CHEN Fan-jun

Abstract

Abstract:

【Objective】 The purpose of this experiment was to study the genetic linkage between seedling growth and grain yield of maize under different nitrogen (N) applied. 【Method】 An F8 maize RIL population derived from an elite hybrid maize YY 22 (Z3×87-1) was used to identify the QTL for seedling growth traits and grain yield under high nitrogen (HN) and low nitrogen (LN) conditions. QTL for shoot dry weight (SDW), root dry weight (RDW), the total root length (TRL), root/shoot ratio (R/S) and grain yield (GY) were identified by composite interval mapping. 【Result】 Totally, 22 QTL were detected by using the software Windows QTL Cartographer version 2.5 (LOD＞2.5). Ten QTLs were detected under HN condition and 12 QTLs under LN condition. Few loci were detected under both LN and HN conditions for the investigated traits, suggesting there is a different genetic basis controlling maize growth at LN versus HN conditions. The genetic linkages were found between seedling growth traits and grain yield in chromosome 5 and 7. 【Conclusion】 Root traits at seedling stage are very important for grain yield. It could be a critical factor for developing N efficient cultivars in maize.

Key words: maize, seedling stage, nitrogen-use efficiency, QTL (quantitative trait locus)

LIU Jian-chao,LI Jian-sheng,MI Guo-hua,CHEN Fan-jun,ZHANG Fu-suo
. QTL Mapping of Seedling Growth Traits and Grain Yield Under Two Nitrogen Conditions in Maize
[J].Scientia Agricultura Sinica, 2009, 42(10): 3413-3420 .

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