令凉环境下外源水杨酸调控樱桃萝卜幼苗低温响应的生理机制研究

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关键词冷凉环境；光合作用；水杨酸；樱桃萝卜

中图分类号S631.1文献标识码A

文章编号 0517-6611（2025）23-0018-05

doi：10.3969/j.issn.0517-6611.2025.23.005

开放科学（资源服务）标识码（OSID）：

StudyonthePhysiologicalMechanismofExogenousSaicylicAcidRegulatingtheLow-temperatureResponseofCherryRadishSeedlingsinColdEnvironment

HANHai-xia2，gi，Xiuetal（1.holfLifeieneadtechologJingoalUniversityUnqab，og lia 01200;Key Laboratory of Economic Crop Stress Biology in Ulanqab，Ulanqab，Inner Mongolia 012000）

AbstractTootiieteultivatiothquesforhydishincoldenvioents，esiologicalrgulatoymchasmsfeogeos salicylicacid（S）apicatioonsdingundercoldstrssasinvstgaedTersultsindcatedtatSAtreamentifucedsdling growth through dual pathways：Positively，O. O1O and 0 .030mmol/L SA significantly activated superoxide dismutase （SOD）activity（increased by 27. 11% 和33. 91% ），inhibited malondialdehyde（MDA）accumulation （decreased by 28 3.43%-45 ： 25% ）by 0.005 - （204号 0.030mmol/L ， maintained cell membrane stability，and promoted ascorbic acid （Vc） synthesis （increased by 49.17%-107.16% ），effectivelyaleviatingoxidativedamagecausedbylowtemperatures.Negatively，SAinibitedchlorophyllsynthesis （decreasedby 35.92% ），reduced water use efficiency （O.O10-0. O3O mmol/L SA reduces WUE by over 77 % ）.Notably，the concentration effect of SA exhibited a threshold characteristic：O.OO5 mmol/L treatment significantly enhanced the net photosynthetic rate（ Pn increased by 49.58% ），while concentrations above O. O1O mmol/L had inhibitory effects （ Pn decreased by 41.66%-100% ）.Although osmotic regulators such as proline and solublesugarsshoednsignificantchanges，drymateraccumulationasposivelycoelatedihSODactivityTissudyidetfed 0.005mmol/L astheoptimal concentration for SAapplication，which balanced stomatal regulation （stomatal conductanceincreased by 207% ）andphotosyntheticmetabolsm，ensuringarbnassmilationhilefetivelymaintaningcellaredoxhomeostasisandactivatingthe antioxidantsysttoigateoldressTaprachsigifantlproedtholdsistaeofeishutsrotofo centration is necessary to avoid adverse effects.

KeywordsCold environment;Photosynthesis；Salicylic acid；Cherry radisl

我国中海拔冷凉气候区占陆地国土总面积的 27.47% ，这类气候区气温低、光照充足、风速大且风多、湿度低、降水少、气候干旱，大部分冷凉地区昼夜温差在 10% 以上，有效积温 1900～4000∘C ，无霜期 90～120d ，冬季最低温在 -10～ 15C[1] 。（剩余9976字）