Artículo
Kernel hardness-Related traits in response to heat stress during the grain-filling period of maize crops
Fecha de publicación:
01/2019
Editorial:
Crop Science Society of America
Revista:
Crop Science
ISSN:
0011-183X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Postflowering heat stress causes the arrest of kernel growth, increasing kernel protein concentration and the relative abundance of γ-zeins, two biochemical traits contributing to maize (Zea mays L.) hardness. The impact of early and late postflowering heat stress on kernel physical traits related to hardness was studied on field-grown maize hybrids differing in their prevailing endosperm texture (two hybrids with a vitreous texture, and two others with a floury texture). Kernel texture was softened by heat stress (P < 0.001), as indicated by decreases in traits that are usually positively related to hardness (thousand-kernel weight [up to 185 g], proportion of large kernels [up to 50–65 percentage points], kernel or bulk density [up to 7 kg hL −1 ] and milling ratio [up to 1 g g −1 ]) and increases in those usually negatively related (proportion of the smaller kernels and floater percentage [up to 30 and 75 percentage points, respec-tively]). Most of these effects were larger (P < 0.01), as heat stress occurred earlier in the grain-filling period. Kernel physical traits of the genotypes with a predominantly floury texture varied the most (P < 0.05) in response to heat stress. Genotypic and environmental variation effects in most hardness-related traits could be accounted for by kernel density (r 2 = 0.74–0.87) or bulk density (r 2 = 0.79–0.93). Sowing date and genotype selections should be considered as crop management practices for reducing or preventing the potential impact of heat stress on maize hardness.
Palabras clave:
MAIZE
,
KERNEL HARDNESS
,
HEAT STRESS
,
GRAIN FILLING
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Articulos(IFEVA)
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Citación
Mayer, Luis Ignacio; Cirilo, Alfredo Gabriel; Maddonni, Gustavo Angel; Kernel hardness-Related traits in response to heat stress during the grain-filling period of maize crops; Crop Science Society of America; Crop Science; 59; 1; 1-2019; 318-332
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