外源赤霉素对干旱胁迫下矮牵牛幼苗生长的影响

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中图分类号：S681.9 文献标志码：A 文章编号：2096-9902（2025）22-0040-04

Abstract：Toinvestigate theeffectsofexogenousgibberellcacid（GA3）onthegrowthof petuniaseedlingsunderdrought stress，thisstudyusedtisse-culturedpetuniaseedlingsasexperimentalmaterials.Theplantsweresubjectedtonormalwater treatment（CK control group） and drought stress treatment（ 20% PEG6Ooo）. Under drought stress conditions，diferent mass concentrations of exogenous GA3 （0，25，50，100，and 200mg/I ）were applied to the seedlings.After three days of treatment， growth，physiological，andbiochemicalindicatorsweremeasured.Theresultsshowedthatunderdroughtstress，plantgrowthdata andleafstomatalareadecreasedsignificantly，whileleafstomataldensity，solubleproteincontent，malondialdehyde（MDA） content，and antioxidant enzymeactivitiesincreasedsignificantly.With increasing concentrations of exogenous GA3， parameters suchasstemandleafgrowth，leafstomatalareasolubleproteincontent，andantioxidantenzymeactivitessignificantlyrcovred， whileleaf stomataldensityandMDAcontentdecreasedmarkedly.ThestudydemonstratesthattheaplicationofexogenousGA 3 can：alleviate drought stress in petunia seedlings，with 50mg/L GA3 showing the most effective results. This research providesa theoretical basis for improving drought-resistant cultivation techniques in petunias.

Keywords： exogenous gibberellic acid （GA3） ; drought stress; petunia seedling;antioxidant enzyme; stomata

矮牵牛（Petuniahybrida）学名碧冬茄，原产于南美洲温带地区，开花繁茂，色彩丰富鲜艳，花型多，品种丰富，因其具有较高商业和观赏价值，被广泛种植于全球各地。（剩余4648字）