Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components

Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components

The objective of this study is to update the data of genetic progress in bread wheat cultivars released in Argentina from 1918 to 2011 (emphasizing the last 20 years) characterizing different agronomic traits of interest for breeders. Experiments were carried out with a wide range of bread wheat cultivars and conducted under field conditions without nutritional and water restrictions. Yields showed a significant (R2 =0.68) tri-linear trend when associated with the cultivar’s year of release. Until the 40s, when the first inflection point occurred, the genetic progress in terms of yield was 0.8 kg ha−1 yr−1 (0.02% yr−1). Between 1940 and 1999, yield genetic progress reached its highest value (51 kg ha−1 yr−1; 1.17% yr−1) but changed after 1999 when values became lower compared to the previous period, showing a value of 14 kg ha−1 yr−1 (0.18% yr−1). Changes in grain yield were mostly explained by increases in harvest index and not by those in above-ground biomass. Plant height showed a negative bi-linear trend with the year of release, reaching an inflexion point well before the introgression of semi dwarfing genes in commercial cultivars. Grain number increased ca. 63% when modern cultivars were compared to older ones, which explains most of the grain yield changes. In contrast to grain number, no significant differences between old and modern cultivars were found for grain weight, with average values of ca. 30 mg grain−1 for all environments explored.

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Main Authors: Lo Valvo, Patricio Javier, Miralles, Daniel Julio, Serrago, Román Augusto
Format: Texto biblioteca
Language:eng
Subjects:GENETIC GAIN, SOURCE-SINK RATIO, GRAIN YIELD, TRITICUM AESTIVUM,
Online Access:http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=47892
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spelling KOHA-OAI-AGRO:478922023-09-12T11:48:46Zhttp://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=47892http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=AAGGenetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield componentsLo Valvo, Patricio JavierMiralles, Daniel JulioSerrago, Román Augustotextengapplication/pdfThe objective of this study is to update the data of genetic progress in bread wheat cultivars released in Argentina from 1918 to 2011 (emphasizing the last 20 years) characterizing different agronomic traits of interest for breeders. Experiments were carried out with a wide range of bread wheat cultivars and conducted under field conditions without nutritional and water restrictions. Yields showed a significant (R2 =0.68) tri-linear trend when associated with the cultivar’s year of release. Until the 40s, when the first inflection point occurred, the genetic progress in terms of yield was 0.8 kg ha−1 yr−1 (0.02% yr−1). Between 1940 and 1999, yield genetic progress reached its highest value (51 kg ha−1 yr−1; 1.17% yr−1) but changed after 1999 when values became lower compared to the previous period, showing a value of 14 kg ha−1 yr−1 (0.18% yr−1). Changes in grain yield were mostly explained by increases in harvest index and not by those in above-ground biomass. Plant height showed a negative bi-linear trend with the year of release, reaching an inflexion point well before the introgression of semi dwarfing genes in commercial cultivars. Grain number increased ca. 63% when modern cultivars were compared to older ones, which explains most of the grain yield changes. In contrast to grain number, no significant differences between old and modern cultivars were found for grain weight, with average values of ca. 30 mg grain−1 for all environments explored.The objective of this study is to update the data of genetic progress in bread wheat cultivars released in Argentina from 1918 to 2011 (emphasizing the last 20 years) characterizing different agronomic traits of interest for breeders. Experiments were carried out with a wide range of bread wheat cultivars and conducted under field conditions without nutritional and water restrictions. Yields showed a significant (R2 =0.68) tri-linear trend when associated with the cultivar’s year of release. Until the 40s, when the first inflection point occurred, the genetic progress in terms of yield was 0.8 kg ha−1 yr−1 (0.02% yr−1). Between 1940 and 1999, yield genetic progress reached its highest value (51 kg ha−1 yr−1; 1.17% yr−1) but changed after 1999 when values became lower compared to the previous period, showing a value of 14 kg ha−1 yr−1 (0.18% yr−1). Changes in grain yield were mostly explained by increases in harvest index and not by those in above-ground biomass. Plant height showed a negative bi-linear trend with the year of release, reaching an inflexion point well before the introgression of semi dwarfing genes in commercial cultivars. Grain number increased ca. 63% when modern cultivars were compared to older ones, which explains most of the grain yield changes. In contrast to grain number, no significant differences between old and modern cultivars were found for grain weight, with average values of ca. 30 mg grain−1 for all environments explored.GENETIC GAINSOURCE-SINK RATIOGRAIN YIELDTRITICUM AESTIVUMField crops research
institution UBA FA
collection Koha
country Argentina
countrycode AR
component Bibliográfico
access En linea
En linea
databasecode cat-ceiba
tag biblioteca
region America del Sur
libraryname Biblioteca Central FAUBA
language eng
topic GENETIC GAIN
SOURCE-SINK RATIO
GRAIN YIELD
TRITICUM AESTIVUM
GENETIC GAIN
SOURCE-SINK RATIO
GRAIN YIELD
TRITICUM AESTIVUM
spellingShingle GENETIC GAIN
SOURCE-SINK RATIO
GRAIN YIELD
TRITICUM AESTIVUM
GENETIC GAIN
SOURCE-SINK RATIO
GRAIN YIELD
TRITICUM AESTIVUM
Lo Valvo, Patricio Javier
Miralles, Daniel Julio
Serrago, Román Augusto
Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components
description The objective of this study is to update the data of genetic progress in bread wheat cultivars released in Argentina from 1918 to 2011 (emphasizing the last 20 years) characterizing different agronomic traits of interest for breeders. Experiments were carried out with a wide range of bread wheat cultivars and conducted under field conditions without nutritional and water restrictions. Yields showed a significant (R2 =0.68) tri-linear trend when associated with the cultivar’s year of release. Until the 40s, when the first inflection point occurred, the genetic progress in terms of yield was 0.8 kg ha−1 yr−1 (0.02% yr−1). Between 1940 and 1999, yield genetic progress reached its highest value (51 kg ha−1 yr−1; 1.17% yr−1) but changed after 1999 when values became lower compared to the previous period, showing a value of 14 kg ha−1 yr−1 (0.18% yr−1). Changes in grain yield were mostly explained by increases in harvest index and not by those in above-ground biomass. Plant height showed a negative bi-linear trend with the year of release, reaching an inflexion point well before the introgression of semi dwarfing genes in commercial cultivars. Grain number increased ca. 63% when modern cultivars were compared to older ones, which explains most of the grain yield changes. In contrast to grain number, no significant differences between old and modern cultivars were found for grain weight, with average values of ca. 30 mg grain−1 for all environments explored.
format Texto
topic_facet GENETIC GAIN
SOURCE-SINK RATIO
GRAIN YIELD
TRITICUM AESTIVUM
author Lo Valvo, Patricio Javier
Miralles, Daniel Julio
Serrago, Román Augusto
author_facet Lo Valvo, Patricio Javier
Miralles, Daniel Julio
Serrago, Román Augusto
author_sort Lo Valvo, Patricio Javier
title Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components
title_short Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components
title_full Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components
title_fullStr Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components
title_full_unstemmed Genetic progress in Argentine bread wheat varieties released between 1918 and 2011 Changes in physiological and numerical yield components
title_sort genetic progress in argentine bread wheat varieties released between 1918 and 2011 changes in physiological and numerical yield components
url http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=47892
http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=
http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=
work_keys_str_mv AT lovalvopatriciojavier geneticprogressinargentinebreadwheatvarietiesreleasedbetween1918and2011changesinphysiologicalandnumericalyieldcomponents
AT mirallesdanieljulio geneticprogressinargentinebreadwheatvarietiesreleasedbetween1918and2011changesinphysiologicalandnumericalyieldcomponents
AT serragoromanaugusto geneticprogressinargentinebreadwheatvarietiesreleasedbetween1918and2011changesinphysiologicalandnumericalyieldcomponents
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