Abstract
Long-day photoperiods and applications of gibberellic acid promoted shoot growth by stimulating leaf enlargement as a result of increasing avaliable photosynthates, which was also reflected in the higher leaf, stem and nodule plant dry weights. Short-day plants had more nodules, but they were smaller (by weight) than those of long-day plants. Gibberellic acid at 1.5×10−6 m enhanced nodule growth without preventing nodule formation. Factors other than just gibberellic acid are concluded to be involved in the responses of nodulation and nitrogen fixation to day length.
Résumé
Des photopériodes de longue journée et l'application d'acide gibbérellique a promu la croissance des pousses en stimulant l'élargissement des feuilles. Celle-ci résuitalent d'un accroissement de photosynthates disponibles. Cet effet s'est aussi réflecté dans un accroissement de la masse de feullies, de tiges et de nodules chez la plante. Des plants soumis à des photopériodes de courte journée présentaient plus de nodules mais ceux-ci étaient plus petits et de masse moindre que ceux de plants soumis à des photopériode de longue journée. L'acide gibbérellique à la dose de 1.5 10−6 m a accru la croissance des nodules sans empêcher la formation des nodules. On a conclu que des facteurs autres que le seul acide gibbérellique sont mêlés aux réponses de la nodulation et de la fixation d'azote à la longueur de la journée.
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Balatti, P.A., Guiamet, J.J. & Montaldi, E.R. Nodulation and nitrogen fixation on vegetative soybean plants as affected by photoperiod and gibberellic acid. World J Microbiol Biotechnol 6, 295–298 (1990). https://doi.org/10.1007/BF01201300
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DOI: https://doi.org/10.1007/BF01201300