Journal of Experimental Botany, Vol 49, 1971-1976, Copyright © 1998 by Oxford University Press
N Munier-Jolain and B Ney
Individual seed weight and seed growth rate are variable within the plant
and among environmental conditions. Seed growth rate remains constant
during the filling period even if assimilate availability is modified. This
paper describes the relationship between the cotyledon cell number fixed at
the beginning of seed filling and the seed growth rate. Two genotypes of
pea were grown in various environmental conditions: field, glasshouse and
growth chamber. One genotype of soybean was sown in field. Seed growth rate
and cotyledon cell number were measured. Variations in seed growth rate
(0.24 to 1.07 mg per degree-day for pea, 0.23 to 0.42 mg per degree-day for
soybean) largely account for differences in individual seed weight. For
each species, cotyledon cell number (from 3.4 x 105
to 10.2 x 105 per seed for pea, from 6.7 x
106 to 9 x 106 per seed for
soybean) and seed growth rate are strongly correlated regardless of
environmental conditions and intraplant position. Consequently, seed growth
rate observed during the seed filling period is determined before this
period during the cell division in the embryo: variations in seed growth
rate depend on the growing conditions during the period between flowering
and the beginning of seed filling.Key words: Grain
legume, seed growth rate, cotyledon cell number.
ARTICLES
Seed growth rate in grain legumes II. Seed growth rate depends on cotyledon cell number
Unité d'Agronomie et de Malherbologie, INRA, 17 rue Sully, BV 1540, F-21034 Dijon cedex, France; Laboratoire d'Agronomie, INRA INA-PG, F-78850 Thiverval-Grignon, France; Corresponding author e-mail: munierjo@dijon.inra.fr
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