Artículo
Role of yield genetic progress on the biochemical determinants of maize kernel hardness
Fecha de publicación:
05/2019
Editorial:
Academic Press Ltd - Elsevier Science Ltd
Revista:
Journal of Cereal Science
ISSN:
0733-5210
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Maize kernel hardness is a key attribute for the global maize processing industry. Breeding for on-farm yield has decreased kernel hardness. However, the underlying changes in zeins and starch composition, mechanistically related to kernel hardness, are unknown. We evaluated changes in zein and starch composition of 32 commercial hybrids released from 1965 to 2016 in Argentina. Kernel protein concentration decreased (∼25%), but zein concentration decreased at higher rates (45%). Zein fractions, Z1 and Z2, decreased throughout the study period. However, the concentration of specific Z2 components decreased (C1 and E zein), while others increased (C2)with hybrid release year. Hardness descriptors all were positively correlated with C1 and E zein concentration and negatively with C2 concentration. Kernel starch and amylose concentrations increased with hybrid release year. No clear changes in amylose to starch ratio were apparent over time. Significant genotype differences in amylose to starch ratio were evident (p < 0.001), but these differences were not correlated to hardness changes. Yield improvement has indirectly changed kernel composition, affecting hardness. Our results limit the relevance of starch components to hardness changes, reinforcing the role of specific zein fractions as observed throughout 50 years of breeding.
Palabras clave:
AMYLOSE
,
KERNEL DENSITY AND VITREOUSNESS
,
KERNEL HARDNESS
,
ZEIN
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Articulos(IICAR)
Articulos de INST. DE INVESTIGACIONES EN CIENCIAS AGRARIAS DE ROSARIO
Articulos de INST. DE INVESTIGACIONES EN CIENCIAS AGRARIAS DE ROSARIO
Citación
Caballero Rothar, Nancy Noemi; Abdala Alonso, Lucas Jorge; Borras, Lucas; Gerde, Jose Arnaldo; Role of yield genetic progress on the biochemical determinants of maize kernel hardness; Academic Press Ltd - Elsevier Science Ltd; Journal of Cereal Science; 87; 5-2019; 301-310
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