Wu Qiuping, Tang Yun, Dong Tingfa, Liao Yongmei, Li Dadong, He Xinhua, Xu Xiao
Key Laboratory of Southwest China Wildlife Resources Conservation, China West Normal University, Nanchong, China.
Institute of Plant Adaptation and Utilization in Southwest Mountain, China West Normal University, Nanchong, China.
Front Plant Sci. 2018 May 8;9:607. doi: 10.3389/fpls.2018.00607. eCollection 2018.
Sex-specific responses to mycorrhiza have been reported in dioecious plant species, but little attention has been paid to the influence of arbuscular mycorrhizal (AM) fungi on competitive ability under intersexual competition. To further address whether this competition is affected by an additional AM fungi supply, saplings were chosen and subjected to two mycorrhizal treatments [inoculated and non-inoculated (control) with an additional AM fungi ] while growing with the opposite sex for 3 months. Compared with the control, the additional AM fungi inoculation induced . saplings to exhibit significant sexual differences in root structure and nutrient uptake (e.g., cortical layer, cross-section area, radius of root tips, and N, K, and Mg content), and enlarged sexual differences in morphology and biomass accumulation (e.g., leaf number increment, shoot height increment, total leaf area, total specific root length, stem dry mass, leaf dry mass, and total dry mass). Meanwhile, inoculated females presented higher values in most of these traits mentioned above than males under intersexual competition. Therefore, we conclude that the intersexual competition can be increased by an additional AM fungi supply, with females gaining more symbiosis-mediated benefits than males.
在雌雄异株植物物种中，已报道了对菌根的性别特异性反应，但丛枝菌根（AM）真菌对两性间竞争下竞争能力的影响却很少受到关注。为了进一步探究这种竞争是否受到额外AM真菌供应的影响，选取了树苗，并在与异性共同生长3个月的过程中，对其进行两种菌根处理[接种额外的AM真菌和未接种（对照）]。与对照相比，额外接种AM真菌诱导树苗在根系结构和养分吸收方面表现出显著的性别差异（例如皮层、横截面积、根尖半径以及氮、钾和镁含量），并扩大了形态和生物量积累方面的性别差异（例如叶片数量增加、茎高增加、总叶面积、总比根长、茎干质量、叶干质量和总干质量）。同时，在两性间竞争中，接种的雌性在上述大多数性状上的值高于雄性。因此，我们得出结论，额外的AM真菌供应会增强两性间竞争，雌性比雄性获得更多共生介导的益处。
