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首页> 外文期刊>Journal of Plant Growth Regulation >Influence of paclobutrazol and application methods on high-temperature stress injury in cucumber seedlings.
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Influence of paclobutrazol and application methods on high-temperature stress injury in cucumber seedlings.

机译:多效唑和施用方法对黄瓜幼苗高温胁迫的影响。

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摘要

Paclobutrazol (PBZ) is a member of the triazole plant growth inhibitor group that is responsible for inducing tolerance to a number of biotic and abiotic stresses. An experiment was therefore conducted to examine whether the application of PBZ at various concentrations (0, 25, 50, and 75 mg l-1) by seed soaking or foliar spray would protect cucumber (Cucumis sativus) seedlings subjected to high-temperature stress. Thirty-five-day-old seedlings were exposed to heat stress at 40 degrees C for 4 h per day for 5 days. PBZ improved the majority of the physiological (for example, relative chlorophyll content and chlorophyll fluorescence ratio) and morphological parameters (for example, shoot and root fresh and dry weights) measured in cucumber seedlings subjected to high-temperature stress. PBZ ameliorated the injuries caused by heat stress by increasing leaf proline content and preventing an increase in leaf electrolyte leakage. PBZ was more effective at increasing the heat tolerance of cucumber seedlings when using the seed-soaking method rather than the foliar spray method. The best protection was obtained when seeds were soaked in 50 mg l-1 PBZ.
机译:多效唑(PBZ)是三唑植物生长抑制剂组的成员,该组负责诱导对多种生物和非生物胁迫的耐受性。因此,进行了一项实验,以研究通过浸种或叶面喷施不同浓度(0、25、50和75 mg l -1 )的PBZ是否能保护黄瓜( Cucumis Sativus )幼苗遭受高温胁迫。将三十五天大的幼苗每天在40摄氏度下暴露于热胁迫下4天,持续5天。 PBZ改善了在高温胁迫下黄瓜幼苗中测得的大部分生理指标(例如,相对叶绿素含量和叶绿素荧光比)和形态参数(例如苗和根的鲜重和干重)。 PBZ通过增加叶片脯氨酸含量并防止叶片电解质渗漏的增加,减轻了因热应激引起的伤害。当使用浸种法而不是叶面喷施法时,PBZ在提高黄瓜幼苗的耐热性方面更有效。将种子浸泡在50 mg l -1 PBZ中可获得最好的保护。

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