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首页> 外文期刊>Plant and Soil >Inoculation with arbuscular mycorrhizal fungi enhances growth of Litchichinensis Sonn. trees after propagation by air-layering
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Inoculation with arbuscular mycorrhizal fungi enhances growth of Litchichinensis Sonn. trees after propagation by air-layering

机译：接种丛枝菌根真菌可增强荔枝ich的生长。通过空气分层传播后的树木

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Lychee (Litchi chinensis Sonn.) is typically propagated by air-layering mature tree branches which are potted in fertilized, soil-free media after cutting. The size of these branches, low phosphorus retention by pot substrates, and fertilization all might combine to preclude benefits of arbuscular mycorrhizas to lychee. In order to examine the potential of lychee to benefit from arbuscular mycorrhizas in an agriculturally realistic context, lychee air-layers were grown for 469 days in ca. 95-l pots of soil-free substrate inoculated with field-collected arbuscular mycorrhizal roots or not at two different levels of phosphorus fertilization. High phosphorus fertilization (a one-time addition of ca. 1.32 g l(-1) slow-release triple-superphosphate) had no detectable effects on mycorrhiza formation, lychee survival, net CO2 assimilation, or growth. Inoculation with indigenous South Florida arbuscular mycorrhizal fungi improved leaflet expansion as early as 120 days after inoculation, and subsequently enhanced height growth and leaf production but did not affect stem diameter growth, net CO2 assimilation, or survival. At harvest, although mycorrhizal colonization was low (average 7.4% colonized root length), mycorrhizal plants had 39% higher above-ground dry weight than control plants. Below-ground dry weights did not differ, but inoculated plants had lower fine root to leaf dry weight ratios than control plants. Leaflets of inoculated plants had higher concentrations of P, K, Cu, and Zn, and lower concentrations of Ca, Mg, and Mn than those of control plants, but total Kjeldahl nitrogen and iron concentrations did not differ significantly 10 months after inoculation. Mycorrhiza enhancement of lychee growth occurred even though phosphorus clearly was not limiting for growth. Our observations suggest that in this soil-free medium, arbuscular mycorrhizal fungus enhancement of copper and iron nutrition improved lychee growth.
机译：荔枝（荔枝（Litchi chinensis Sonn。））通常通过空气分层的成熟树枝繁殖，这些树枝在切割后被盆栽在施肥的无土壤培养基中。这些分支的大小，盆底物对磷的保留率低以及施肥都可能会妨碍丛枝菌根对荔枝的好处。为了在农业现实的背景下研究荔枝从丛枝菌根中受益的潜力，荔枝气垫层在约200天中生长了469天。 95升盆栽的无土基质接种有田间采集的丛枝菌根或未施以两种不同水平的磷肥。高磷施肥（一次性添加约1.32 g l（-1）缓释三过磷酸钙）对菌根的形成，荔枝存活，净CO2同化或生长没有可检测的影响。最早在接种南佛罗里达州的丛枝菌根真菌后，可在接种后120天进行接种，从而提高了叶片的高度，增加了叶片的产量，但并未影响茎的直径增长，净CO2吸收或存活。在收获时，尽管菌根定植率很低（定植根长平均为7.4％），但菌根植物的地面干重比对照植物高39％。地下干重没有差异，但是接种的植物的细根与叶片干重比要比对照植物低。与对照植物相比，接种植物的小叶中的P，K，Cu和Zn浓度较高，而Ca，Mg和Mn的浓度较低，但是接种后10个月凯氏定氮和铁的总浓度没有显着差异。尽管磷显然没有限制菌丝生长，但菌根增强了荔枝的生长。我们的观察结果表明，在这种无土的培养基中，丛枝菌根真菌对铜和铁营养的增强改善了荔枝的生长。

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