【摘要】 为探究丛枝菌根真菌(AMF)与不同性别合栽模式下桑树(Morus alba)生长的内在联系,分别对雌-雌、雄-雄和雌-雄这三种性别合栽模式下的桑树幼苗进行接种和不接种摩西斗管囊霉(Funneliformis mosseae)处理,通过比较植株的叶形态、生物量及其生物量分配、气体交换、叶绿素含量和侵染率方面的差异来揭示接种丛枝菌根真菌(AMF)对不同性别合栽模式下植株生物量、光合和侵染率的影响。结果显示:与对照相比,接种AMF显著提高了3种性别合栽模式植物的总叶面积和总叶片数、生物量、气体交换(P_n、T_r、G_s)、叶绿素含量(叶绿素a含量和叶绿素a/b值)和侵染率。接种AMF后,雌-雄合栽模式总叶面积、总叶片数、叶生物量、茎生物量、地上生物量和总生物量、G_s、T_r、叶绿素a含量、叶绿素b含量和总叶绿素含量显著高于雌-雌合栽模式,总叶片数、茎生物量、P_n、G_s、叶绿素a含量、叶绿素b含量和总叶绿素含量显著高于雄-雄组合模式。雌-雄合栽模式根冠比和根质量分数显著低于同性合栽模式。该研究表明接种AMF后,侵染率的增加更有利于异性合栽模式的桑树光合能力增加进而提高生物量,尤其是对地上部分生物量的促进。更多还原

【Abstract】 To investigate effects of arbuscular mycorrhizal fungi(AMF) on growth of Morus alba under different sexual combination groups(FF,female-female combination group;MM,male-male combination group;FM,female-male combination group),the seedlings uninoculated and inoculated with Funneliformis mosseae under three sex-related combination groups were defined as control(CK) and AMF treatment group,respectively.The leaf morphology,yield,biomass allocation,gas exchange,concentrations of chlorophyll and colonization rate were compared to investigate the effects of inoculation with AMF on plant yield,photosynthetic characteristics and colonization rate under different sexual combination groups.Our results indicated that leaf morphology(total leaf area and leaf number),yield(yield of leaf,stem,root and aboveground and total yield),gas exchange(P_n,T_r and G_s),chlorophyll concentrations(chlorophyll a and chlorophyll a/b) and the colonization rate were remarkably improved upon inoculation with AMF in comparison to uninoculated controls.After inoculation with AMF,FM had higher total leaf area,total leaf number,leaf yield,stem yield,aboveground yield,total yield,T_r,G_s,chlorophyll a,chlorophyll b and total chlorophyll than those of FF,and higher total leaf number,stem yield,P_n,G_s,chlorophyll a,chlorophyll b and total chlorophyll than those of MM.The root to shoot ratio and root mass fraction of inter-sexual group was significantly lower than those of two intra-sexual groups after AMF inoculation.Our results indicate that increased colonization rate of AMF is more beneficial in promoting the yield of mulberry under inter-sexual combination group by improving the photosynthetic capability,especially the aboveground yield.更多还原