HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Verges, V. L. Articles by Brown-Guedira, G. Search for Related Content PubMed Articles by Verges, V. L. Articles by Brown-Guedira, G. Agricola Articles by Verges, V. L. Articles by Brown-Guedira, G. Related Collections Wheat Plant Disease Crop Genetics

CROP BREEDING & GENETICS

Heritability Estimates and Response to Selection for Fusarium Head Blight Resistance in Soft Red Winter Wheat

^a Dep. of Crop Production and Forestry, Univ. of Lleida, Centre UdL-IRTA, Av Rovira Roure 191, 25198 Lleida, Spain
^b Dep. of Plant and Soil Sciences, Univ. of Kentucky, Lexington, KY 40546
^c USDA-ARS, Raleigh, NC

^* Corresponding author (dvs{at}uky.edu)

Fusarium head blight (FHB), caused by Fusarium graminearum (Schwabe), is an economically important disease of wheat (Triticum aestivum L.). After epidemics in the USA during the 1990s, a resistance-breeding effort was undertaken focusing initially on the transfer of Type II resistance from unadapted Chinese cultivars. The objective of this study was to determine the magnitude and heritability of resistance in populations derived from adapted parents. Three soft red winter (SRW) wheat populations of 40 families each were artificially inoculated with Fusarium graminearum under mist irrigation in 2003 and 2004 at Lexington and Princeton, KY. Traits measured included anthesis date, plant height, disease severity, Fusarium-damaged kernels (FDK) and deoxynivalenol (DON) concentration. Broad sense heritability (BSH) estimates were generated from entry means over the four environments. Heritability of severity was approximately 0.30 in all populations; heritability of FDK ranged from 0.16 to 0.20. In 2003, a selection intensity of 20% was imposed on all populations, and the eight lowest severity families were advanced and evaluated at Lexington and Princeton in 2004. Direct selection response, averaged over both locations, ranged from 1.9 to 4.1% reduction in severity. Correlated reduction in FDK ranged from 0.4 to 6.5%; there was also a correlated increase in plant height of 1.7 to 4.1 cm after one cycle of selection. Progress in FHB resistance breeding in the absence of major QTL is likely to be constrained by low heritability and genotype x environment (G x E) interaction.

Abbreviations: BSH, broad sense heritability • daa, d after anthesis • DON, deoxynivalenol • FDK, Fusarium-damaged kernels • FHB, Fusarium head blight • G x E, genotype x environment • QTL, quantitative trait locus or loci • SRW, soft red winter