土壤压实胁迫下丛枝菌根真菌对高羊茅生理生态的影响
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青岛农业大学园林与林学院

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青岛市科技计划基础研究项目(121454)


Effect of arbuscular mycorrhizal fungi on physiology and ecology of Festuca elata under soil compaction stress
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    摘要:

    本试验研究了2种丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)摩西斗管囊霉(Funneliformis mosseae)和根内根孢囊霉(Rhizophagus intraradices)在不同土壤容重下,对高羊茅(Festuca elata)品种‘艾瑞3号’的生理生态影响。结果表明:在1.5 g·cm-3土壤容重下,(1)接种AMF能有效增加土壤压实胁迫下高羊茅植株的株高、分蘖数、干物质质量、根系活力以及过氧化氢酶(CAT)活性、叶绿素a和b、总叶绿素含量,叶片净光合速率(Pn)、蒸腾速率(Tr)以及气孔导度(Gs),显著降低其叶片胞间CO2浓度(Ci)。(2)共同接种F. mosseae+R. intraradices处理的菌根侵染率和菌丝密度比单接种F. mosseae提高17.3%和25.2%,与单接种R. intraradices处理相比提高53.0%和36.3%;共同接种处理的株高、分蘖数、干物质质量、叶绿素a和b、总叶绿素含量,叶片净光合速率(Pn)、蒸腾速率(Tr)以及气孔导度(Gs)分别比未接种对照显著增加36.1%、39.5%、144.0%、43.1%、100.0%、59.3%、52.5%、33.3%、181.1%;共同接种比未接种显著降低了32.9%叶片胞间CO2浓度(Ci)。另外,共同接种处理的根系活力以及CAT活性比对照未接种的高1.4和1.5倍。可见,AMF可以通过增强高羊茅根系活力、降低氧化胁迫造成的伤害、提高植物叶绿素含量与光合作用来增强自身的抗土壤压实能力,且共同接种F. mosseae+R. intraradices处理的效果优于单一接种处理。

    Abstract:

    Tall fescue species "Arid Ⅲ" and arbuscular mycorrhizal fungus Funneliformis mosseae and Rhizophagus intraradices were used as materials in this experiment, the soil campaction (1.2 g·cm-3、1.3 g·cm-3、1.4 g·cm-3、1.5 g·cm-3 treatment) and inoculation with AMF [inoculation with F. mosseae, R. intraradices, F. mosseae +R. intraradices and non-inoculation treatment] were tested in two factors under greenhouse conditions, to evaluate the effect of AMF on physiology and ecology of tall fescue. The results showed that, under 1.5 g·cm-3 soil compaction stress (1) AMF could effectively increase the plant height, tiller number, dry matter quality, the activity of root system, catalase, the chlorophyll a and b, chlorophyll content, net photosynthesis rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and reduce the intercellular CO2 concentration (Ci) in leaves of tall fescue. (2) Double inoculation treatment resulted in the increase of colonization and hyphal density, reaching 17.3% and 25.2% respectively as compared with F. mosseae, compared with R. intraradices, double inoculation treatment were increased 53.0%, 36.3%. And, double inoculation with F. mosseae+R. intraradices treatment resulted in the increase of plant height, tiller number, dry matter quality, the chlorophyll a and b, chlorophyll content, Pn, Tr and Gs of leaves of tall fescue with double inoculation treatment reaching 36.1%, 39.5%, 114.0%, 43.1% , 100.0%, 59.3%, 52.5%、33.3%、181.1% , while their Ci decreased by 32.9%, respectively, as compared with the uninoculated control; the activity of root systemand catalaseIn addition was 1.4 times and 1.5 times higher than that in the control, respectively. It can be seen that AMF can enhance the ability of tall fescue under campaction tolerance by enhancing the activity of root system, reducing the damage caused by oxidative stress, regulating chlorophyll content and photosynthesis in plants, and the effect of double inoculation with F. mosseae+R. intraradices is better than that of single inoculation.

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  • 收稿日期:2019-06-02
  • 最后修改日期:2019-08-25
  • 录用日期:2019-08-04
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