摘要
为明确根系氧环境对干旱胁迫下小麦幼苗生长发育的影响,本研究采用不同浓度(0、10%、20%)PEG-6000模拟干旱,分析不加气(NA)、气泵加气(IA)、微纳米气泡加气(MNB)3种根系氧环境对水培小麦根系、地上部形态及叶绿素荧光参数等指标的影响。结果表明,10%PEG胁迫下MNB处理小麦根系总长、株高、叶面积、根干重、叶干重和PSⅡ最大光化学效率均高于NA和IA处理。20%PEG胁迫下IA处理小麦根系总长、根表面积、根系体积、叶面积和PSⅡ最大光化学效率高于MNB和NA处理;MNB和IA处理小麦株高较NA分别显著增加123.3%、116.2%。不同浓度PEG干旱胁迫下,MNB处理小麦PSⅡ实际光化学效率ΦPSⅡ、光合电子传递效率(ETR)、光化学淬灭系数(qP)均(除20%PEG处理下的ΦPSⅡ)显著高于NA和IA处理。综上,IA和MNB营造的根系氧环境均具有缓解水培小麦幼苗干旱胁迫的效果,且以MNB效果更优。
This study was aimed to clarify the effects of root oxygen environment on the growth and development of wheat seedlings under drought stress.The drought stress was simulated with different concentrations(0,10%,20%)of PEG-6000,and three kinds of root oxygen environment were set as no air addition(NA),air addition by air pump(IA)and air addition with micro-nano bubble(MNB).Their effects on root system,above-ground morphology and chlorophyll fluorescence of hydroponic wheat were analyzed.The results showed that under 10%PEG stress,the total root length,plant height,leaf area,root dry weight,leaf dry weight and the maximum photochemical efficiency of PSⅡunder MNB treatment were higher than those under NA and IA treatments.Under 20%PEG stress,the total root length,root surface area,root volume,leaf area and the maximum photochemical efficiency of PSⅡunder IA treatment were higher than those under MNB and NA treatments;the plant height under MNB and IA treatments were 123.3%and 116.2%higher than that under NA treatment,respectively.Under different PEG concentrations stress,the actual photochemical efficiency(ΦPSⅡ),photosynthetic electron transport efficiency(ETR)and photochemical quenching coefficient(qP)ofΦPSⅡunder MNB treatment were significantly higher than those under NA and IA treatment except forΦPSⅡunder 20%PEG treatment.In conclusion,the root oxygen environments created by IA and MNB had the effect of alleviating drought stress to hydroponic wheat seedlings,and the effect of MNB was better.
作者
林之栋
师君慧
张文山
师长海
李玲燕
万雪洁
刘义国
Lin Zhidong;Shi Junhui;Zhang Wenshan;Shi Changhai;Li Lingyan;Wan Xuejie;Liu Yiguo(Qingdao Agricultural University/Qingdao Biological Water Saving Engineering Research Center/Key Laboratory of Dry Farming Technology of Shandong Province,Qingdao 266109,China;Yihai Kerry(Qingdao)Flavor Oil Co.,Ltd.,Qingdao 266000,China;Rizhao Academy of Agricultural Sciences,Rizhao 276800,China)
出处
《山东农业科学》
北大核心
2023年第9期32-38,共7页
Shandong Agricultural Sciences
基金
山东省高等学校青创科技支持计划项目(2019KJF013)
山东重点研发计划项目(重大科技创新工程,2022LZGC005-4)
黄三角国家农高区科技专项(2022SZX20,2022SZX25)
中央引导地方科技发展专项(21-1-4-ny-31-nsh,22-1-3-2-zzyd-nsh)。
关键词
模拟干旱
根系氧环境
小麦幼苗
生长发育
叶绿素荧光特性
Simulated drought
Root oxygen environment
Wheat seedlings
Growth and development
Chlorophyll fluorescence characteristics
