Summary
Lotus tenuis was inoculated withRhizobium spp. and grown at three different night temperatures (17, 21 and 27°C) and at two different photoperiods for each temperature: short days (SD) of 8-h light and long days (LD) of 16-h light. Night temperature exerted a stronger effect on dry-matter partitioning than of total dry-matter accumulation. Leaf area increased under LD though less N per leaf area was found. A greater number of leaves under SD might be linked to a day-length effect upon apical dominance and hence on branching, thus resulting in a greater crown growth. Nodulation and nitrogen fixation was greater under SD though specific nodule activity was the same regardless of the environmental conditions of growth. It can be concluded that the best planting time forLotus tenuis would be in the autumn when the days are shortening and the temperature is lower.
Résumé
Lotus tenuis a été inoculé avecRhizobium spp. et mis à croître aux trois températures nocturnes, de 17, 21, et 27°C et à deux photo-périodes pour chaque température: des jours courts (SD) de 8 heures de lumière et des jours longs (LD) de 16 heures de lumière. La température nocturne exerce un effet davantage marqué sur la répartition de la matière sèche que sur l'accumulation totale de la matière sèche. La surface foliaire augmente dans le cas des LD bien que l'on trouve moins d'azote par unité de surface foliaire. Dans le cas des SD, de plus grands nombres de feuilles pourraient être liés à un effet de longueur de jours sous dominance apicale, c'est-à-dire en banchement, résultant donc dans la croissance d'une plus grande couronne. La nodulation et la fixation d'azote sont plus grandes dans le cas des SD bien que l'activité spécifique des nodules soit la même, indépendamment des conditions environnementales de croissance. On peut en conclure que le meileur moment de plantation pourLotus tenuis serait l'automne lorsque les jours raccourcissent et que la température est plus basse.
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Balatti, P.A., Giménez, D.O. Effect of night temperature and photoperiod on growth, nodulation and nitrogen fixation inLotus tenuis . World J Microbiol Biotechnol 5, 161–167 (1989). https://doi.org/10.1007/BF01741839
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DOI: https://doi.org/10.1007/BF01741839