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- W79581607 abstract "In maize, grain yield is closely associated with kernel number. Therefore, understanding the mechanisms of kernel number determination is of great importance to physiologists, modelers, and breeders. In this crop, the critical period for kernel set overlaps the developmental window for ear growth (silking - 227°C day to silking + 100°C day). While the presilking period controls ear fertility, kernel abortion occurs in the postsilking period. The latter matches the lag phase of grain filling, which varies among hybrids. Temperature modifies the duration of this critical period, and consequently the amount of photosynthetic energy available for kernel set. Photosynthetically active radiation (PAR) intercepted by the plants (IPAR) during this period is a useful tool for predicting kernel set when water and nutrients are not limiting, but genotypic differences in the response restrain the broad use of a single model. Curvilinear functions fitted for one hybrid gave better outputs than the linear ones, especially under very dense or sparse stands. Curvilinear functions based on IPAR and plant growth rate (PGR) suggested thresholds of (i) 0.31 MJ plant−1 d−1 or 1 g plant−1 d−1 to avoid plant barrenness, and (ii) 2.169 MJ planel d−1 or 6 g planel d−1 for reaching maximum kernel set in the apical ear and having ears plant−1 > 1. Nevertheless, synchronous pollination within and between earshoots improved prolificacy and final kernel set per fertile spikelet, modifying the above mentioned thresholds. Hence, genotypic differences in pollination timing should also be considered in modeling kernel set in maize." @default.
- W79581607 created "2016-06-24" @default.
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- W79581607 date "2015-10-26" @default.
- W79581607 modified "2023-09-25" @default.
- W79581607 title "New Relationships Between Light Interception, Ear Growth, and Kernel Set in Maize" @default.
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- W79581607 doi "https://doi.org/10.2135/cssaspecpub29.c6" @default.
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