Changes in alfalfa forage quality and stem carbohydrates induced by arbuscular mycorrhizal fungi and elevated atmospheric CO2
Changes in alfalfa forage quality and stem carbohydrates induced by arbuscular mycorrhizal fungi and elevated atmospheric CO2
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DOI：
10.1111/aab.12092
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发表时间：
2014-03-01
影响因子：
2.6
通讯作者：
Goicoechea, N.
中科院分区：
文献类型：
--
作者：
Baslam, M.;Antolin, M. C.;Goicoechea, N.
苜蓿是一种分布广泛的豆科牧草，其叶片蛋白质含量高，茎适合生产生物乙醇。然而，紫花苜蓿牧草的消化率，质量和产量可能会发生变化，在未来的气候变化情景。这种豆科植物可以与固氮细菌和丛枝菌根真菌（AMF）建立双重共生关系。AMF的存在可以改变苜蓿营养生长过程中生物量生产和分配的演变。我们假设，菌根共生可能会改变的数量和/或质量的碳水化合物和木质素的叶子和/或茎的苜蓿，这些变化取决于大气中的CO2浓度在植物生长。结果表明，与未接种菌根的苜蓿相比，接种菌根的苜蓿叶片、茎和根的生物量增加，半纤维素含量增加，木质素含量降低，茎中葡萄糖和果糖含量增加。这些结果表明，提高牧草质量（叶）和提高潜力的生物乙醇转化（茎）在菌根苜蓿种植CO2浓度升高。此外，潜在的茎产生甲烷加强了其适用于生物质转化为生物乙醇。
Alfalfa is a widely distributed forage legume whose leaves are high in protein content and whose stems are suitable for bioethanol production. However, alfalfa forage digestibility, quality and yield may vary under future climate change scenarios. This legume can establish double symbiosis with nitrogen-fixing bacteria and arbuscular mycorrhizal fungi (AMF). The presence of AMF can modify the evolution of biomass production and partitioning during the vegetative growth of alfalfa. We hypothesised that mycorrhizal symbiosis may change the quantity and/or quality of carbohydrates and lignin in leaves and/or stems of alfalfa, with these changes being dependent on the atmospheric CO2 concentration at which plants are grown. Results showed that mycorrhizal alfalfa plants exposed to elevated CO2 had improved leaf, stem and root biomass, enhanced amount of hemicellulose and decreased concentration of lignin in cell walls of leaves as well as increased levels of glucose and fructose in stems compared with non-mycorrhizal alfalfa. These results indicated improved forage quality (leaves) and enhanced potential for bioethanol conversion (stems) in mycorrhizal alfalfa cultivated under elevated CO2. Moreover, the potential of stems for producing CH4 reinforced their suitability for the conversion of biomass into bioethanol.