Kernel hardness related traits in response to heat stress during the grain-filling period of maize crops

MAYER, L.I. ; CIRILO, A. G; MADDONNI, G.A.

CROP SCIENCE

CROP SCIENCE SOC AMER

Lugar: Baltimore; Año: 2019 vol. 59 p. 318 - 332

0011-183X

Postflowering heat stress causes the arrest of kernel growth, increasing kernel protein concen-tration and the relative abundance of g -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], propor-tion 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 ( r2 = 0.74?0.87) or bulk density ( r2 = 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