Soybean (Glycine max) seed growth characteristics in response to light enrichment and shading
2006
Liu, X.(Chinese Academy of Sciences, Harbin (China). Northeast Inst. of Geography and Agroecology) E-mail:[email protected] | Herbert, S.J.(University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences) | Baath, K.(University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences) | Hashemi, A.M.(University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences)
Evans, an indeterminate Group 0 soybean, was subjected to light reduction and enrichment treatments from the beginning of pod formation until final harvest for two years in Massachusetts. Higher rates of seed growth, greater seed dry weight, and higher cotyledon cell number were all observed with light enrichment. There was a reduction in seed growth rate, cotyledon cell number, endogenous ABA levels in testa and cotyledon with shade. The level of ABA in cotyledon during seed development was significantly correlated with seed growth rates only under shade treatments. Both the growth rates and seed filling duration were influenced by variation in light interception by the soybean canopy. The effects of varying light treatment on seed size, within one genotype, were most likely due to the differences in seed growth rate and cotyledon cell number.
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