This study investigated the influence of plant size, as determined by
plant density, and fruit load variation on the production and quality
of bell pepper (Capsicum annuum L.) seeds. Six-week-old 'Resistant Gia
nt no. 4' bell pepper seedlings were transplanted 15, 30,45, and 60 cm
apart. Plants spaced 45 cm apart were not thinned or were thinned to
one or three fruit per plant. Pepper plants grown at low plant densiti
es produced larger fruit and seeds that germinated faster and at highe
r percentages than plants grown at higher densities. Assimilate export
rate (AER) increased linearly with plant spacing. At harvest, C excha
nge rate (CER) and AER of plants with nonthinned fruit loads were almo
st-equal-to 300% and 500% higher, respectively, than those of plants w
ith one or three fruit. Fruit thinning decreased CER and AER; however,
seeds produced by plants with one or three fruit had significantly hi
gher germination percentages than plants with full fruit loads. These
observations suggest that the high CERs of smaller plants with nonthin
ned fruit loads may have been insufficient to compensate completely fo
r the higher sink demands. Therefore, crop cultural practices that inc
rease the ratio of pepper plant size to total fruit count may increase
the quality of seeds produced by those plants.