Phenotypic and genetic analysis to identify secondary physiological traits for improving grain yield in wheat considering anthesis time variability

ABELEDO, L. GABRIELA; ZHOU, YAOPENG; PUHL, LAURA E.; MIRALLES, DANIEL J.; ALVAREZ PRADO, SANTIAGO; COSTA, JOSE M.

EUPHYTICA

SPRINGER

Lugar: Berlin; Año: 2019 vol. 215

0014-2336

Abstract Identification of secondary traits in mappingpopulations is usually hindered by the strongeffect of anthesis time. Thus, considering the variabilityin time to anthesis in combination with an accuratephenotyping of mapping populations and availablemolecular tools is a possible way for recognisingsecondary traits to improve yield potential. The aim ofthis work was to identify secondary traits to performindirect selection for grain yield (GY) in a bread wheatmapping population consisting of 124 doubled haploidlines, derived from the cross between two soft redwinter wheat genotypes with contrasting photoperiodresponse. Genomic regions linked to different traitswere analysed under two environments. The populationshowed a strong effect of time to anthesis overGY, as expected. A large variability in GY wasobserved but only two QTLs were detected onchromosome 5A for this trait, which co-localized withQTLs of time to anthesis. GY variation was partiallyassociated with above-ground dry matter at maturity(AGDM) and to a lesser extent with harvest index(HI). Detected QTLs for grains per m2 (GN), grainweight, AGDMand HI explained between 25 and 61%of the GY additive genetic variance. GN, defined asthe product between spike dry weight at anthesis(SDW) and fruiting efficiency (FE), was the mainnumerical component that explained most of thevariation in GY