QTL mapping and phenotypic variation for root architectural traits in maize (Zea mays L.)

被引:73
|
作者
Burton, Amy L. [1 ]
Johnson, James M. [2 ]
Foerster, Jillian M. [2 ]
Hirsch, Candice N. [3 ,4 ]
Buell, C. R. [3 ,4 ]
Hanlon, Meredith T. [1 ]
Kaeppler, Shawn M. [2 ]
Brown, Kathleen M. [1 ]
Lynch, Jonathan P. [1 ]
机构
[1] Penn State Univ, Dept Plant Sci, University Pk, PA 16801 USA
[2] Univ Wisconsin, Dept Agron, Madison, WI 53706 USA
[3] Michigan State Univ, Dept Plant Biol, E Lansing, MI 48824 USA
[4] Michigan State Univ, DOE Great Lakes Bioenergy Res Ctr, E Lansing, MI 48824 USA
基金
美国农业部;
关键词
SYSTEM ARCHITECTURE; PHOSPHORUS ACQUISITION; GENETIC-IMPROVEMENT; PHASEOLUS-VULGARIS; DROUGHT-RESISTANCE; FIELD CONDITIONS; SEEDLING STAGE; WATER REGIMES; SHOOT TRAITS; UPLAND RICE;
D O I
10.1007/s00122-014-2353-4
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
QTL were identified for root architectural traits in maize. Root architectural traits, including the number, length, orientation, and branching of the principal root classes, influence plant function by determining the spatial and temporal domains of soil exploration. To characterize phenotypic patterns and their genetic control, three recombinant inbred populations of maize were grown for 28 days in solid media in a greenhouse and evaluated for 21 root architectural traits, including length, number, diameter, and branching of seminal, primary and nodal roots, dry weight of embryonic and nodal systems, and diameter of the nodal root system. Significant phenotypic variation was observed for all traits. Strong correlations were observed among traits in the same root class, particularly for the length of the main root axis and the length of lateral roots. In a principal component analysis, relationships among traits differed slightly for the three families, though vectors grouped together for traits within a given root class, indicating opportunities for more efficient phenotyping. Allometric analysis showed that trajectories of growth for specific traits differ in the three populations. In total, 15 quantitative trait loci (QTL) were identified. QTL are reported for length in multiple root classes, diameter and number of seminal roots, and dry weight of the embryonic and nodal root systems. Phenotypic variation explained by individual QTL ranged from 0.44 % (number of seminal roots, NyH population) to 13.5 % (shoot dry weight, OhW population). Identification of QTL for root architectural traits may be useful for developing genotypes that are better suited to specific soil environments.
引用
收藏
页码:2293 / 2311
页数:19
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