摘要
耐盐性不同的两个大麦品种在渗透势相同的 NaCl,Na^+或Cl^-胁迫下,根系的 Na^+/Cl^-均大于叶片的对应值,叶片 Na^+与根系 Na^+含量之比均小于1,而 Cl^-含量之比均大于1。Na^+胁迫伤害大于 Cl^-胁迫伤害。在 Cl^-胁迫下,大麦幼苗干物质积累量较大,根系质膜和液泡膜微囊 H^+-ATPase 活性较高,叶片电解质渗出率较低。叶片致死 Cl^-含量约为每克干重4.2～4.8 mmol。在不同浓度的 NaCl 胁迫下,两品种根系的 Cl^-含量均约占整株 Cl^-含量的20%,但滩引2号根系和地上部的 Cl^-含量都低于科品7号,其主要原因是滩引2号单株 Cl^-的吸收量较低。
The ratio of Na^+/Cl^- in roots was higher than that in leaves of two barley varieties withdifferent salt tolerance under NaCl,Na^+ and Cl^- stresses of the same osmotic potencial.Na^+ contnet inleaves was smaller and Cl^- content in leaves was greater than that in roots.Ionic damage to plant cells underNa^+ stress was greater than that under Cl^- stress.The lethal Cl^- content of leaf cells was 4 200～4 800μmol/g DW.Under NaCl stress,Cl^- content in roots of the two varieties was about 20% of that in wholeplant.Cl^- content in roots and shoots of Tanyin No.2 was smaller than that of Keping No.7 due to its lessCl^- uptake in Tanyin No.2.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1993年第3期15-19,共5页
Journal of Nanjing Agricultural University
基金
国家自然科学基金
关键词
大麦
耐盐性
氯离子
钠离子
barley
salt tolerance
thereshold value
tolerable Cl^- content
H^+-ATPase
