Anther Extrusion and Its Association with Fusarium Head Blight in CIMMYT Wheat Germplasm

Kaijie Xu,Zhonghu He,Pawan K Singh,Xinyao He,Susanne Dreisigacker

doi:10.3390/agronomy10010047

Kaijie Xu, Zhonghu He + Show 3 more

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https://doi.org/10.3390/agronomy10010047

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Journal: Agronomy	Publication Date: Dec 28, 2019
Citations: 28	License type: CC BY 4.0

Affiliation: Centro Internacional de Mejoramiento de Maíz Y Trigo

Abstract

Pronounced anther extrusion (AE) is associated with field resistance to Fusarium head blight (FHB), one of the most devastating diseases of wheat globally. In this study, two recombinant inbred line (RIL) populations were used to map quantitative trait loci (QTL) for AE and field FHB resistance and to investigate the association of both traits at the genetic level. Furthermore, two panels of International Maize and Wheat Improvement Center (CIMMYT) wheat breeding lines were evaluated to describe the phenotypic association between the two traits in detail. Highly significant negative correlation was identified between AE and FHB severity in the two populations and the two panels, with r-values ranging from 0.55 to 0.74. QTL analysis in the two RIL populations identified 12 QTL for AE and nine for FHB resistance, of which five QTL located on chromosomes 3BL, 4BS, 4DS, 5AL, and 5BL were associated with both AE and FHB, collectively explaining over 50% of phenotypic variation for FHB. The QTL on chromosomes 4BS, 4DS, 5AL, and 5BL were closely linked to Rht-B1, Rht-D1, Vrn-A1, and Vrn-B1 genes, respectively. In conclusion, AE is closely related to field FHB resistance and could be used as a morphological marker in wheat breeding for field FHB resistance.

Highlights

Bread wheat (Triticum aestivum L.) is a staple food crop and one of the most widely grown around the world [1]
quantitative trait loci (QTL) for anther extrusion (AE) and nine for Fusarium head blight (FHB) resistance, of which five QTL located on chromosomes 3BL, 4BS, 4DS, 5AL, and 5BL were associated with both AE and FHB, collectively explaining over 50% of phenotypic variation for FHB
The current study presents results from two recombinant inbred line (RIL) populations, “NASMA” × “IAS20*5/H567.71” and “NASMA” × “RPB709.71/COC”, and two panels of CIMMYT breeding lines, to further investigate the interrelationships among AE, FHB, plant height (PH), and days to heading (DH)

Summary

Introduction

Bread wheat (Triticum aestivum L.) is a staple food crop and one of the most widely grown around the world [1]. To meet future food demands, wheat yield and quality must be enhanced. Fusarium head blight (FHB) is one of the most devastating diseases of wheat globally, which leads to yield losses, quality degradation, and mycotoxin contamination, greatly threatening food and feed safety [2]. Host resistance to FHB is quantitatively inherited and influenced significantly by the environment, making breeding for this trait a difficult task. Type I resistance exhibits frequent association with phenological, morphological, and flower biology traits, such as plant height (PH), days to heading (DH), and anther extrusion (AE) [4,5,6]

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