Abstract
The common bean is an important source of minerals and protein in human nutrition. The objective of this study was to investigate possible maternal effects on phosphorus contents in seeds of the common bean, to estimate the heritability in early hybrid generations for the phosphorus content character and to evaluate the potential for genetic improvement. The controlled crossings were performed among Pérola x Guapo Brilhante and TPS Nobre x Guapo Brilhante cultivars. Reciprocal F1, and F2 generations as well as backcross populations were produced by each hybrid combination. The range of variation in phosphorus content among tested progenies was from 3.38 to 5.78 g kg-1 dry matter, and no significant maternal effect was discovered. Narrow sense heritability was of an intermediate 65.54% to low 21.37 % value. An increase of 19.17 % was obtained for phosphorus content in the seeds using just the three parents tested in this study.
Highlights
Phosphorous is a mineral present in practically all foods and their deficiency is rare (Fennema 2000)
No significant difference was observed between reciprocal F1 hybrids suggesting no significant maternal effect for phosphorus content in common bean seeds (Table 1)
The common bean seed phosphorus content is dependent on the cotyledons, products of fertilization
Summary
Phosphorous is a mineral present in practically all foods and their deficiency is rare (Fennema 2000). Phosphorous plays a part in energy metabolism, since it is a constituent of adenosine triphosphate (ATP) and is important in absorbing and transporting nutrients, in regulating protein activity and in the acidbase balance (Cozzolino 2007) For this reason, 0.8 to 1.2 g phosphorous is recommended, according to age, to supply the daily requirements for an adult (Kathleen 1998). The existence of genetic variability showed that selection is possible for the common bean germplasm with a high phosphorous content for diet enrichment. Another advantage in that its genotypes with high seed phosphorous contents have an increase in grain yield (Silva et al 2003)
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