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中国农学通报

中国农学通报 ›› 2013, Vol. 29 ›› Issue (17): 14-18.doi: 10.11924/j.issn.1000-6850.2012-3847

所属专题： 生物技术

• 畜牧 动物医学 蚕 蜂 • 上一篇    下一篇

盐胁迫对紫花苜蓿生长及光合生理特性的影响

范方 张玉霞 姜健 杨宝灵 高明波   

  • 收稿日期:2012-11-27 修回日期:2013-01-06 出版日期:2013-06-15 发布日期:2013-06-15
  • 基金资助:
    国家自然科学基金;中央高校基金项目;大连市科技计划项目

Effects of salt stress on the growth and photosynthetic physiological characteristics of alfalfa

  • Received:2012-11-27 Revised:2013-01-06 Online:2013-06-15 Published:2013-06-15

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摘要： 为了探明盐害对紫花苜蓿生长及光合生理特性的影响，为提高植物耐盐性、增加生物学产量、培育耐盐新品种提供科学依据，通过田间试验，以2年生紫花苜蓿公农一号为研究对象，在不同浓度NaCl处理下研究了紫花苜蓿的生理生化响应。结果表明：(1)S1和S2处理组的净光合速率(Pn)、气孔导度(Gs)在胁迫初期小幅上升后开始下降并随时间的延长趋势变缓，S3处理组则持续下降。(2)各处理组的胞间CO2浓度(Ci)则呈先急剧升高后逐渐下降的趋势。(3)不同浓度处理组蒸腾速率(Tr)均呈下降趋势，后期略有恢复。(4)紫花苜蓿叶片SPAD值和地上部分生物量均随着盐浓度的提高显著降低。研究表明，NaCl胁迫下，紫花苜蓿叶片光合作用受到抑制，进而影响到地上部分生物量。但低盐胁迫后期，苜蓿叶片的光合作用有恢复现象，表现出其具有一定的耐盐性。

关键词: 创新, 创新

Abstract: In order to investigate the impact of salt stress on growth and photosynthetic physiological characteristics in alfalfa (Medicago sativa) provided scientific foundation for enhancement of plant salt tolerance , increase of biomass and breeding new salt-tolerant plant.The two-year Gongnong No.1 as experimental material to study physiological and biochemical responses under different concentration of NaCl in fields. The results show that (1)S1 and S2 of photosynthesis rate (Pn) and stomatal conductance (Gs) had a increase only slightly at early period, and then resumed its descent which had fluctuation smaller with the course of time, the trend of S3 was declined continuously yet.(2)Intercellular CO2 concentration (Ci) in all treatment groups appears the trend of initially increase sharply and then decrease gradually along with treatment time.(3)Transpiration rate (Tr) in all treatment groups appears the trend of decreased with treatment time progressed and has a slight recover in late treatment. SPAD value and aboveground biomass of alfalfa decreased remarkably with the increasing of salt concentration. Research shows the photosynthesis was restrained and further affected aboveground biomass. At the later stage of low salinity stress, the photosynthesis has recover. The results indicated that alfalfa has a certain salt-tolerant.

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