QTL mapping and epistasis analysis of brace root traits in maize

Ku, Lixia; Sun, Zhaohui; Wang, C. L.; Zhang, J.; Zhao, Ruifang; Liu, H. Y.; Tai, Guo; Chen, Y. H.

doi:10.1007/s11032-011-9655-x

Cited by 40 publications

(35 citation statements)

References 25 publications

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“…With the advances in methods to dissect the genetic architecture of complex traits, identifying epistatic interactions between QTLs has received more attention (Garcia et al, 2008;Schön et al, 2010;Ku et al, 2012). Different epistatic interactions were detected for P efficiency indexes, providing an additional level of complexity to the genetic inheritance of these traits.…”

Section: Discussionmentioning

confidence: 99%

Genetic Architecture of Phosphorus Use Efficiency in Tropical Maize Cultivated in a Low‐P Soil

et al. 2014

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Phosphorus (P) deficiency is a major limiting factor for crop production in several countries. A better understanding of the genetic components of P use efficiency (PUE) is required to improve crop performance in low‐P soils. To date, no QTLs (quantitative trait loci) were mapped for PUE using grain yield and other late phenotypic data in tropical conditions. Thus, we evaluated the genetic architecture of PUE in tropical maize (Zea mays L.) using multiple interval mapping for design III in a population of 140 RILs (recombinant inbred lines) backcrossed with both parental lines. The parental lines contrasted for yield and for PUE, a phenotypic index that was further decomposed into P acquisition efficiency (PAE) and P utilization efficiency. Our results showed that dominance effects were more important than additive effects for explaining the variations in PUE and its components. Approximately 80% of the QTLs mapped for PAE co‐localized with those for PUE, indicating that the efficiency in acquiring P is the main determinant of PUE in tropical maize. Also, QTLs for PUE and PAE were located near to candidate genes previously associated with root development. Thus, we present important information to guide breeding strategies for the development of maize cultivars more adapted to P deficiency.

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Section: Discussionmentioning

confidence: 99%

Genetic Architecture of Phosphorus Use Efficiency in Tropical Maize Cultivated in a Low‐P Soil

et al. 2014

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“…These overlapping QTLs suggest a conserved genetic mechanism for controlling root angle in grasses. Additionally, several epistatic QTLs have been identified in maize brace root indicating that a complex genetic network controls nodal root formation and angles [29]. In rice, DEEPER ROOTING 1 (DRO1) has been shown to control deep root exploration, which increases yield under drought conditions [30 ].…”

Section: Modulation Of Rsa Confers Drought Tolerancementioning

confidence: 99%

Regulation of plant root system architecture: implications for crop advancement

Rogers

Benfey

2015

Current Opinion in Biotechnology

346

218

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“…While examination of the seedling root system is relatively easy, root traits in young plants may be poor predictors of mature root system architecture or plant performance (Zhu et al 2011). A few QTL for architectural traits have been identified in mature maize root systems, including those for adventitious root formation (Mano et al 2005), brace root whorl number (Ku et al 2012), and several crown root traits including number (Lebreton et al 1995;Guingo et al 1998;Liu et al 2008a;Cai et al 2012), diameter (Guingo et al 1998), angle (Guingo et al 1998), and length (Liu et al 2008a;Cai et al 2012). A more detailed analysis of QTL for architectural traits of mature maize plants would enable breeding of crops with improved stress tolerance.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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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.

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QTL mapping and epistasis analysis of brace root traits in maize

Cited by 40 publications

References 25 publications

Genetic Architecture of Phosphorus Use Efficiency in Tropical Maize Cultivated in a Low‐P Soil

Genetic Architecture of Phosphorus Use Efficiency in Tropical Maize Cultivated in a Low‐P Soil

Regulation of plant root system architecture: implications for crop advancement

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

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