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Journal of Experimental Botany, Vol 49, 1963-1969, Copyright © 1998 by Oxford University Press

ARTICLES

Seed growth rate in grain legumes I. Effect of photoassimilate availability on seed growth rate

N Munier-Jolain, N Munier-Jolain, R Roche, B Ney and C Duthion
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

The dry weight of harvested grain legume seeds is strongly related to their growth rate during the period of storage accumulation in the cotyledons, which begins approximately at the end of embryo cell division. Depodding, defoliation, shading or changes in air CO2 concentration were applied during seed filling (i.e. during the decrease in seed water concentration) to field and glasshouse-grown plants, in order to affect the source-sink ratio. The experiments involved three legume species, namely pea (Pisum sativum L.), soybean (Glycine max L. Merr.) and white lupin (Lupinus albus L.). Some treatments affected the number of abortions of less developed seeds from younger pods, but they did not significantly affect the number or the growth rate of filling seeds, demonstrating the priority of carbohydrate partitioning to filling seeds. The maximum growth rate of seeds was achieved regardless of the intra-plant competition level, and the duration of seed growth was shortened if the photosynthetic activity was not sufficient to fulfil the assimilate demand of filling seeds.Key words: Grain legume, seed growth, assimilate partitioning, assimilate supply.
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