Kinetin alleviates the influence of waterlogging and salinity on growth and affects the production of plant growth regulators in Vigna sinensis and Zea mays

Abstract

Growth criteria (shoot height, root length and dry weight) of 14-d-old Vigna sinensis and Zea mays were mostly suppressed by waterlogging or salinization using artificial seawater mixture during the subsequent 3 weeks; the water level in pots was, respectively, kept at 120% or 60% of water field capacity. The suppression in growth induced by salinization was greater than that obtained by waterlogging. The pattern of changes in growth appeared similar to chlorophyll a and b as well as activity of d-aminolevulinic acid dehydratase (ALA-D). On the other hand, waterlogging significantly increased indole-acetic acid (IAA) in shoots of both species but salinity had a decreasing effect. Both treatments decreased gibberellic acid (GA 3) levels in shoots of Vigna sinensis and Zea mays as well as zeatin in shoots of Zea mays. Meanwhile, abscisic acid (ABA) was greatly accumulated in shoots of the stressed plants. Foliar application of 50 ppm kinetin counteracted the resulting reduction in growth and in chlorophylls of both species but partially lowered the inhibition in ALA-D activity. Moreover, kinetin increased IAA, GA 3 and zeatin in the stressed plants to mostly reach control levels, but markedly reduced ABA. These findings indicate that relief of the damage and restoration of normal conditions was maintained either partially or completely by application of kinetin. This recovery may be a consequence of several roles played by such hormones, which can cause triggering of the internal cellular metabolism and also induce alterations in the ratios of growth regulators. plant growth regulators / salinity / Vigna sinensis / waterlogging / Zea mays Résumé-La kinétine permet d'éviter l'effet de la submersion et de la salinité sur la croissance et affecte la production de régulateurs de croissance chez Vigna Sinensis et Zea mays. La croissance (hauteur des parties aériennes, longueur des racines et poids sec) de plantules de Vigna sinensis et Zea mays âgées de 14 jours a été arrêtée principalement par la submersion ou la salinisation en utilisant un mélange artificiel d'eau de mer durant les 3 semaines suivantes ; le niveau d'eau dans les pots a été maintenu respectivement à 120 % et 60 % de la capacité au champ. L'effet négatif sur la croissance induit par la salinisation était plus important que celui obtenu par la submersion. La forme des modifications de la croissance est apparue similaire pour la chlorophylle A & B, aussi bien que pour l'activité de l'acide d-aminolevulinique déhydratase (ALA-D). D'un autre côté la submersion a augmenté de façon significative la teneur en acide indolacétique (IAA) des parties aériennes des 2 plantes, mais la salinité a eu un effet décroissant. Les 2 traitements ont diminué les niveaux d'acide gibbérellique (GA 3) dans les parties aériennes de Vigna sinensis ou Zea mays, ainsi que celui de zéatine dans celles de Zea mays. Pendant ce temps, l'acide abscisique (ABA) était accumulé en abondance dans les parties aériennes des plantes stressées. L'application foliaire de 50 ppm de kinétine s'es...

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