Academic Journal
Kernel Hardness-Related Traits in Response to Heat Stress during the Grain-Filling Period of Maize Crops.
| Title: | Kernel Hardness-Related Traits in Response to Heat Stress during the Grain-Filling Period of Maize Crops. |
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| Authors: | Mayer, Luis I., Cirilo, Alfredo G., Maddonni, Gustavo A. |
| Source: | Crop Science; Jan/Feb2019, Vol. 59 Issue 1, p318-332, 15p |
| Abstract: | 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, respectively]). 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. [ABSTRACT FROM AUTHOR] |
| Subject Terms: | EFFECT of stress on corn, GRAIN growth, ENDOSPERM |
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| ISSN: | 0011183X |
| DOI: | 10.2135/cropsci2018.04.0245 |
| Database: | Complementary Index |
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