Changes in yield determinants and quality traits in wheat after 12 cycles of recurrent selection

MAICH, R. H.; MANERA, G. A.; LONDERO, W. H.; VANZETTI, L. S.; HELGUERA, M.; DI RIENZO, J. A.

CEREAL RESEARCH COMMUNICATIONS

AKADEMIAI KIADO RT

Año: 2020

0133-3720

The objective of this study was to test the genetic response to 12 cycles of a recurrent selection program for grain yield and related traits. During two seasons the 39 S-derived families (three/C0?C12 populations) were evaluated under conventional (CT) and non-tillage (NT) systems. Grain and biomass yield were determined. The grain number per square meter and harvest index were also estimated. Flour protein content, sodium dodecyl sulphate sedimentation, and lactic acid solvent retention capacity were considered as end-use quality predictive tests. High molecular weight glutenin subunits (HMW-GS) variationwas also analyzed. A signifcant increase in grain yield per selection cycle, estimated in 3.25 g m−2 (1.3%) per year, was found under NT, but there was a not signifcant genetic progress under CT. The decrease in the percentage of protein in the most advanced selection cycles (11.0% vs. 9.7%) did not negatively afect its quality. HMW-GS variation analysis showed the erosion of extreme subunits related to gluten strength. After 24 years of recurrent selection, the grain yield was improved without afecting its industrial quality