The objective of this work was to evaluate the effects of selection for high protein on seed physiological
quality and grain yield of soybean. Four populations of BC1F4
and four of F4
, each from a cross between a
commercial variety and a line bearing high protein seeds, were used. The high protein content selection has a
tendency to affect negatively the seed physiological quality. Estimates of correlation coefficients between
protein content and grain yield were mostly negative but varied among populations. It is possible to obtain lines
with high protein content, keeping the grain yield and the seed physiological quality of their respective recurrent
progenitors.