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Annals of Botany 78: 39-44, 1996
© 1996 Annals of Botany Company

The Effect of Different Levels of N Limitation on Sugars, Amino Acids, Growth and Biomass Partitioning in Broadbean (Vicia faba L.)

JAN BUYSSE, HILDE VAN DEN BROECK and ROEL MERCKX

Laboratory Soil Fertility and Soil Biology, K.U. Leuven, K. Mercierlaan 92, 3001 Heverlee, Belgium

June 16, 1995 ; January 4, 1996

Broadbean plants (Vicia faba L.) were submitted to three different levels of steady state N limitation. Relative addition rates of N were 0.06, 0.1 and 0.14d-1. Plants were harvested at five evenly distributed times over a 2d period. Shoot growth corresponded well with the imposed treatment. Root growth, relative to shoot growth, was highest at the 0.06d-1treatment. Diurnal patterns of soluble sugars, amino acids and starch were analysed. On average, soluble sugar levels were highest in the plants of the 0.06d-1treatment whereas average free amino acid levels were highest in the 0.14d-1treatment. Shoot growth increased as the concentration of shoot amino acids increased. No such correlation however could be found between root growth and free sugar levels in the root.

Broadbean; Vicia faba L.; exponential addition; N limitation; free sugar; amino acids; diurnal cycle; functional equilibrium; starch


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