摘要
干旱的反复发生会导致植物自身产生胁迫记忆,进而会对植物的滞尘能力产生影响,然而,干旱胁迫记忆如何影响植物的滞尘效率及植物的生理响应和适应尚未明确。通过向开顶式气室(OTCs)内输送机动车尾气,停止供水达到干旱,分别设置尾气胁迫组(P)、干旱胁迫组(D)、双胁迫组(PD)和对照组(CK)4个处理组。每个周期性胁迫设置为期12 d,恢复期也为12 d。结果表明,桂花叶片表面滞尘量在P组下由S1周期的33.77μg·cm^(-2)下降到S3的21.32μg·cm^(-2),PD组下由S1周期的38.08μg·cm^(-2)下降到S3的25.70μg·cm^(-2);蜡质层滞尘量在P组呈显著性下降(P<0.001),在PD组中下降不显著。植物体内抗氧化酶活性随着周期处理而逐渐减小,可溶性糖含量先上升后下降,叶绿素含量与颗粒物在第2阶段呈显著负相关,第3周期并无显著相关性。表明反复干旱下提高了植物生理对胁迫的适应性,说明植物的胁迫记忆可以帮助植物更好地应对再次到来的胁迫。
Recent studies have shown that repeated occurrences of drought can lead to drought stress memory formation in plants.However,how the retention of particulate matter(PM)of plants changes under drought and how the drought stress memory of plants affects the PM retention efficiency and physiological response of plants have not been clarified.In this study,we add vehicle exhaust gas into open-top chambers(OTCs)and stop water supply to imitate stress.We set up four treatment groups:particulate matter stress group(P),drought stress group(D),particulate matter×drought stress group(PD)and control group(CK).Each periodic stress lasted for 12 days,and the recovery period was for 12 days too.The PM retention of Osmanthus fragrans showed that the PM retention on the leaf surfaces under particulate matter stress(P)declined from 33.77μg·cm^(-2)in S1 to 21.32μg·cm^(-2)in S3,and from 38.08μg·cm^(-2)in S1 to 25.70μg·cm^(-2)in S3 under particulate matter×drought stress(PD).The PM retention in waxy layer decreased significantly under particulate matter stress(P<0.001),but not significant under particulate matter×drought stress treatment.The determination of physicochemical properties of plants showed that the antioxidant enzyme activity in plants gradually decreased with the periodic treatment,the soluble sugar content first increased and then decreased,and the chlorophyll content was significantly and negatively correlated with particulate matter in the second stage,but there was no significant correlation in the third cycle.This shows that repeated drought improves the physiological adaptability of plants to stress,indicating that plant stress memory can help plants better cope with the re-arrival stress.
作者
杨琳曦
王剑武
张晶
陈健
YANG Lin-xi;WANG Jian-wu;ZHANG Jing;CHEN Jian(School of Forestry and Biotechnology,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;Zhejiang Forest Resources Monitoring Center,Hangzhou 311300,Zhejiang,China;State Key Laboratory of Subtropical Silviculture,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China)
出处
《西北林学院学报》
CSCD
北大核心
2024年第2期166-172,共7页
Journal of Northwest Forestry University
基金
国家自然科学基金项目(41471442)
浙江省林业科技项目(2022SY04)。
