LIU Jie.Effects of Simulated Salt and Alkali Conditions on the Mineral Nutrition of Helianthus annuusL.[J].Northern Horticulture,2014,38(02):1-5.
盐碱胁迫对向日葵体内矿质营养的影响
- Title:
- Effects of Simulated Salt and Alkali Conditions on the Mineral Nutrition of Helianthus annuusL.
- 文章编号:
- 1001-0009(2014)02-0001-05
- 分类号:
- S 565. 5
- 文献标志码:
- A
- 摘要:
- 以向日葵品种“白葵杂6号”为试材，将中性盐NaCl、Na2SO4和碱性盐NaHCO3、Na2CO3按不同比例混合，模拟出单纯盐胁迫和盐碱混合胁迫条件处理向日葵，测定了向日葵幼苗生长及体内各矿质元素含量等指标；在此基础上，从根外矿质离子存在状态及体内矿质营养水平，探讨盐、碱2种胁迫对向日葵矿质离子吸收的影响。结果表明：盐、碱胁迫下向日葵体内矿质元素积累明显不同；盐胁迫下氮、磷、硫、铁等元素的含量非但没下降反而有所升高；而盐碱混合胁迫下，几乎所有矿质营养元素的含量均明显降低；碱胁迫的高pH导致根外环境中矿质离子的活度及游离度急剧降低甚至沉淀，加之根吸收能力的降低，是其表现出营养胁迫的根本原因；碱胁迫对植物所造成的营养破坏效应既是碱胁迫的主要致害因素之一，也是其甚于盐胁迫的主要原因之一。
- Abstract:
- Taking ‘Baikuiza No. 6’ Helianthus annuusL.as material，under salt stress and salt- alkaline mixed stress，which were established by mixing NaCl，Na2SO4，NaHCO3 and Na2CO3 at various proportions.Several indices of seedlings stressed- including growth and mineral elements contents were determined.On the base，by analyzing the status of mineral ions outside the roots and the level of mineral nutrition of plant body，an investigation into the different effects of ion absorption about salt stress and alkali stress were carried out.The results showed that there were significant difference on mineral nutrition content between salt stress and salt alkaline mixed stress.The contents of N，P，S and Fe did not decrease，but increased under salt stress；while contents of almost all mineral nutrients declined under salt- alkaline mixed stress.High pH caused ionic activity and free concentrations of some mineral elements to decline sharply and even to precipitate coupled with the reduction of the absorption capacity of roots,which was the fundamental reason that alkali stress showed nutrient stress.Nutritional damage of alkali stress was not only one of the main baneful factors，but also one of the main reasons why it was more severe than salt stress.
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备注/Memo
作者简介：刘杰（1984-），女，博士，讲师，现主要从事植物逆境生理生态的教学与科研工作。E-mail：liujie655@163.com.