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首页> 外文期刊>The Journal of General and Applied Microbiology >Effect of IAA produced by Klebsiella oxytoca Rs-5 on cotton growth under salt stress
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Effect of IAA produced by Klebsiella oxytoca Rs-5 on cotton growth under salt stress

机译：产酸克雷伯菌Rs-5产生的IAA对盐胁迫下棉花生长的影响

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Klebsiella oxytoca Rs-5 isolated with ACC (1-aminocyclopropane-1-carboxylate) deaminase activity as the sole nitrogen source could obviously promote cotton seedling growth under salt stress and produce phytohormone indole-3-acetic acid (IAA). The amount of IAA produced by the strain Rs-5 was measured, and the effect of IAA on cotton growth under salt stress was studied. Different treatments were set to treat cotton seeds with fermentation broth containing strain Rs-5 (FB), strain Rs-5, fermentation broth with bacteria removed (FB-NB), fermentation broth without bacteria or IAA (FB-NB-NI) and single IAA solutions (SI) according to the IAA concentration after strain Rs-5 culturing of 48, 72 and 120 h. The germination rate, dry weight, plant height, root length and malondialdehyde (MDA), proline and endogenous IAA content in roots were determined. The results showed that both IAA produced by strain Rs-5 and the strain were effective in promoting cotton growth under salt stress. The growth and ability to resist salt stress of cotton seedlings were increased with the enhancement of IAA concentration. The treatment of FB containing bacteria and IAA at 120 h obtained the best state of cotton growth, when the IAA content was the highest in the fermentation broth (42.14 ??g?·La€“1). The germination rate, dry weight, plant height and root length were increased by 29.4%, 24.3%, 27.2% and 27.2% , respectively, compared to the saline control. The strain Rs-5 and/or IAA could obviously reduce the MDA and proline content and increase the endogenous IAA content in cotton seedlings. However, the efficacy of other components in the fermentation broth was inconspicuous.
机译：以ACC（1-氨基环丙烷-1-羧酸酯）脱氨酶活性为唯一氮源的产酸克雷伯菌Rs-5可以明显促进盐胁迫下棉花幼苗的生长，并产生植物激素吲哚-3-乙酸（IAA）。测量了由Rs-5菌株产生的IAA的量，并研究了IAA对盐胁迫下棉花生长的影响。设置了不同的处理方法，以使用含有菌株Rs-5（FB）的发酵液，菌株Rs-5，去除细菌的发酵液（FB-NB），不含细菌或IAA的发酵液（FB-NB-NI）处理棉花种子。根据菌株Rs-5培养48、72和120小时后的IAA浓度，使用单一IAA溶液（SI）。测定发芽率，干重，株高，根长和丙二醛（MDA），根中脯氨酸和内源IAA的含量。结果表明，由Rs-5菌株产生的IAA和该菌株均能有效促进盐胁迫下棉花的生长。随着IAA浓度的升高，棉花幼苗的生长和抗盐胁迫的能力增强。当发酵液中IAA含量最高时（42.14 g·L·La-1），在120 h处理含FB的细菌和IAA可获得最佳的棉花生长状态。与生理盐水相比，发芽率，干重，株高和根长分别增加了29.4％，24.3％，27.2％和27.2％。 Rs-5和/或IAA菌株可以明显降低棉花幼苗的MDA和脯氨酸含量，并增加内源IAA含量。但是，发酵液中其他成分的功效并不明显。

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