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首页> 外文会议>2004 CIGR International Conference : Collection of Extent Abstracts >Effects of Dual Inoculations of SinorhizobiumMeliloti and Arbuscular Mycorrhizal Fungi onGrowth of Salt-Stressed Alfalfa
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Effects of Dual Inoculations of SinorhizobiumMeliloti and Arbuscular Mycorrhizal Fungi onGrowth of Salt-Stressed Alfalfa

机译：根瘤菌和丛枝菌根真菌双重接种对盐胁迫紫花苜蓿生长的影响

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Alfalfa is the most important forage crop in the semi-arid regions of Iran, which isoften produced in salt-affected soils. Arbuscular mycorrhizal fungi (AMF) occur naturally inmost soils and often improve growth of some agronomic crops in saline conditions. In asterile sand culture experiment, alfalfa (Medicago sativa L., cv. Kara Yondjeh) wereinoculated with three species of AMF, Glomus mosseae, G.intraradices, G.versiforme and/orS.meliloti, or left uninoculated as controls.Three weeks after seed germination, four salinitylevels of 1.3, 3.5, 5.5 and 8.5 dSm-1 (S1..S4, respectively) in irrigation water containing amixture of NaCl, CaCl2, MgSO4 and Na2SO4 (1.09: 2.03: 1.25 : 1 , w/v, respectively) wereapplied to the pots in two days interval for three months. S1 (1.3 dSm-1) was the EC ofnutrient solution as a base medium. Results showed that mycorhizal plants had significantlyhigher shoot and root P concentrations at all salinity levels in comparison with nonmycorrhizalplants. G.mosseae inoculated plants showed the minimum reduction of root Pwith increasing salinity. The main effects of mycorrhization showed that the G.mosseae andG.intraradices inoculated plants had significantly higher (P<0.05) shoot and root dry weightsthan G.versiforme inoculated and non-inoculated plants. Thus, the ratio of root/shoot drymatter, which is positively correlated with plant tolerance to salt or drought stresses, weresignificantly higher in G.mosseae and G.intraradices inoculated plants. Mean comparison forroot colonization showed that it was adversely affected by salinity. Maximum rootcolonization was observed with G.mosseae and G.intraradics,which resulted in greater plantsgrowth. Although root Cl was enhanced with increasing salinity, it had significantly lowerconcentration in mycorrhizal than non-mycorrhizal plants at the highest salinity level (P<0.05).Regardless of mycorrhizal status, root and shoot K were negatively influenced by increasingsalt concentration in the medium. Increasing salinity caused a considerable reduction in rootCa/Na ratio (P<0.05), but inoculation of plants with S.meliloti significantly improved this ratioat higher salinity levels than non-inoculated ones.Based on results, it seems that ,inoculationof alfalfa plants with both G.mosseae (or G.intraradices) and S.meliloti improves its growthand salt-tolerance indices.
机译：苜蓿是伊朗半干旱地区最重要的牧草作物， 通常在受盐影响的土壤中产生。丛枝菌根真菌（AMF）天然存在于 多数土壤，并经常在盐分条件下改善某些农作物的生长。在一个 无菌砂培养试验，苜蓿（Medicago sativa L.，cv。Kara Yondjeh）是 接种了三种AMF，Gromus mosseae，G.intraradices，G.versiforme和/或 苜蓿链球菌（S.meliloti）或未接种作为对照。种子发芽后三周，四个盐度 含有1.5％dSm-1的灌溉水中的水平分别为1.3、3.5、5.5和8.5 dSm-1（分别为S1..S4）。 将NaCl，CaCl2，MgSO4和Na2SO4的混合物（分别为1.09：2.03：1.25：1，w / v） 间隔两天涂在花盆上，持续三个月。 S1（1.3 dSm-1）是EC的 营养液作为基础培养基。结果表明，霉菌属植物具有明显的 与非菌根相比，在所有盐度水平下更高的芽和根中P浓度 植物。接种G.mosseae的植物显示根P减少最小 随着盐度的增加。菌根的主要作用表明，G.mosseae和 接种G.intraces的植物的茎干和根的干重显着较高（P <0.05） 比无花粉虱的接种植物和未接种的植物都高。因此，根/茎干之比 与植物对盐或干旱胁迫的耐受性正相关的是 G.mosseae和G.intraces接种的植物中显着更高。的均值比较 根部定植表明它受到盐度的不利影响。最大根 G.mosseae和G.inradiradics观察到了定植，这导致了更多的植物 生长。尽管根际Cl随着盐度的增加而增强，但其显着降低 盐度最高时，菌根比非菌根的浓度高（P <0.05）。 不论菌根状态如何，根和芽钾素都受到增加的不利影响 培养基中的盐浓度。盐度增加导致根系大量减少 Ca / Na比（P <0.05），但接种苜蓿链球菌可显着改善该比例 盐度水平高于未接种盐。根据结果，似乎 苜蓿（G.mosseae）（或G.intraradices）和苜蓿链球菌（S.meliloti）的苜蓿植物可以改善其生长 和耐盐指数。

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