Oxygation Enhances Growth,Gas Exchange and Salt Tolerance of Vegetable Soybean and Cotton in a Saline Vertisol

查看全文 作　　者：Surya P. [1]Bhattarai;David J. [1]Midmore

机构地区：[1]Centre for Plant and Water Science,Department of Molecular and Life Sciences,Central Queensland University

出　　处：《Journal of Integrative Plant Biology》索引2009年第51卷第7期,共14页

基　　金：funded by Central Queensland University Rockhampton,Australia 摘　　要：Impacts of salinity become severe when the soil is deficient in oxygen.Oxygation(using aerated water for subsurface drip irrigation of crop) could minimize the impact of salinity on plants under oxygen-limiting soil environments.Pot experiments were conducted to evaluate the effects of oxygation(12% air volume/volume of water) on vegetable soybean(moderately salt tolerant) and cotton(salt tolerant) in a salinized vertisol at 2,8,14,20 dS/m ECe.In vegetable soybean,oxygation increased above ground biomass yield and water use efficiency(WUE) by 13% and 22%,respectively,compared with the control.Higher yield with oxygation was accompanied by greater plant height and stem diameter and reduced specific leaf area and leaf Na+ and Cl- concentrations.In cotton,oxygation increased lint yield and WUE by 18% and 16%,respectively,compared with the control,and was accompanied by greater canopy light interception,plant height and stem diameter.Oxygation also led to a greater rate of photosynthesis,higher relative water content in the leaf,reduced crop water stress index and lower leaf water potential.It did not,however,affect leaf Na+ or Cl- concentration.Oxygation invariably increased,whereas salinity reduced the K+:Na+ ratio in the leaves of both species.Oxygation improved yield and WUE performance of salt tolerant and moderately tolerant crops under saline soil environments,and this may have a significant impact for irrigated agriculture where saline soils pose constraints to crop production. 关键词：菜用大豆气体交换盐碱地耐盐性生长黑土棉花

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Oxygation Enhances Growth,Gas Exchange and Salt Tolerance of Vegetable Soybean and Cotton in a Saline Vertisol

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