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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Quantitative trait locus analysis of adventitious and lateral root morphology of barley grown at low and high P

Jingyi Guo A * , Guangdeng Chen A * , Xizhou Zhang A C , Tingxuan Li A , Haiying Yu A and Chunji Liu B
+ Author Affiliations
- Author Affiliations

A College of Resources, Sichuan Agricultural University, Chengdu 611130, China.

B CSIRO Agriculture, 306 Carmody Road, St Lucia, Qld 4067, Australia.

C Corresponding author. Email: zhangxzhou@126.com

Functional Plant Biology 45(9) 957-967 https://doi.org/10.1071/FP17271
Submitted: 28 September 2017  Accepted: 15 March 2018   Published: 12 April 2018

Abstract

Barley (Hordeum vulgare L) may alter its root morphology to improve P acquisition efficiency under low-P (LP) stress. This research studied the variations in adventitious and lateral root morphological traits of barley and mapped their quantitative trait loci (QTLs) under LP and high P (HP). The recombinant inbred lines were derived from the F1 population of a cross between CN4027 and Baudin. Two experiments aimed to identify QTLs related to adventitious and lateral root morphological traits under LP and HP. The length, surface area and volume of adventitious and lateral roots were measured. Under HP, Baudin had larger root morphology, especially lateral root morphology, than CN4027. LP stress induced lateral root growth but inhibited adventitious root growth. Nineteen QTLs for root morphological traits were detected. These QTLs clustered within four regions (Cl2H, Cl3H, Cl4H and Cl7H) on chromosomes 2H, 3H, 4H and 7H, with corresponding contributions of 12.0–42.9%. Some QTLs are linked with the QTLs for P efficiency detected previously, demonstrating the role of root morphological traits in P efficiency. The Cl2H region was identified in the interval bPb3927665bPb3265744 on chromosome 2H and had major effects on lateral root growth, especially under LP. Lateral root length and surface area increased when alleles from Baudin were present at the QTLs in Cl2H. This study demonstrated the patterns of growth among root types and the role of lateral roots in barley’s adaption to LP stress. The QTL clusters, especially Cl2H, may offer clues for fine mapping and map-based cloning.

Additional keywords: Hordeum vulgare L., phosphate deficiency, root growth.


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