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Dwarfism does not modify mean area per leaf and light interception in indeterminate autumn-sown white lupin

Published online by Cambridge University Press:  27 March 2009

N. Harzic
Affiliation:
Station d'Amélioration des Plantes Fourragères, INRA, 86600 Lusignan, France
C. Huyghe
Affiliation:
Station d'Amélioration des Plantes Fourragères, INRA, 86600 Lusignan, France

Summary

The effect of dwarfism on leaf number and size was investigated on six pairs of tall and dwarf nearisogenic lines of indeterminate autumn-sown white lupins (Lupinus albus L.). Dwarfism reduced mainstem height by 41% and first-order branch length by 22%. It also slightly decreased the number of leaves on the mainstem and first-order branches without affecting the time of flowering. Leaf size was not reduced. Logistic equations were used to analyse differences in the patterns of light interception by leaf canopies relative to thermal time from sowing during the growth of seven dwarf lines and three tall cultivars sown on different dates. The genotypes studied had long periods of low light interception during their early growth. No differences were found between most of the equation parameters for dwarf and tall genotypes. Only the proportion of light intercepted at flowering differed and this was explained by differences in flowering time. The dwarf character did not limit the ability of the crop canopies to intercept light. It is concluded that the character can be introduced into a wide range of genetic backgrounds without deleterious effects.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 1996

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