Mistletoes are ecologically important parasitic plants,with> 1600 species from five lineages worldwide.Mistletoe lineages exhibit distinct patterns of species diversification and host specificity,however,the mechan...Mistletoes are ecologically important parasitic plants,with> 1600 species from five lineages worldwide.Mistletoe lineages exhibit distinct patterns of species diversification and host specificity,however,the mechanisms underlying these differences are poorly understood.In this study,we analysed a comprehensive parasite-host network,including 280 host species from 60 families and 22 mistletoe species from two lineages(Santalaceae and Loranthaceae) in Xishuangbanna,located in a biodiversity hotspot of tropical Asia.We identified the factors that predict the infection strength of mistletoes.We also detected host specificity and the phylogenetic signal of mistletoes and their hosts.We found that this interaction network could be largely explained by a model based on the relative abundance of species.Host infection was positively correlated with diameter at breast height and tree coverage,but negatively correlated with wood density.Overall,closely related mistletoe species tend to interact more often with similar hosts.However,the two lineages showed a significantly different network pattern.Rates of host generality were higher in Loranthaceae than in Santalaceae,although neither lineage showed phylogenetic signal for host generality.This study demonstrates that the neutral interaction hypothesis provides suitable predictions of the mistletoe-host interaction network,and mistletoe species show significant phylogenetic signals for their hosts.Our findings also indicate that high species diversification in Loranthaceae may be explained by high rates of host generality and the evolutionary history shared by Loranthaceae species with diverse host plants in the tropics.展开更多
Endophytic fungi were identified from different parts of the medicinal parasitic mistletoe Cladocolea micrantha and from its host Anacardium occidentale, suggesting a strict host-parasite relationship. Eight fungal en...Endophytic fungi were identified from different parts of the medicinal parasitic mistletoe Cladocolea micrantha and from its host Anacardium occidentale, suggesting a strict host-parasite relationship. Eight fungal endophytes were isolated and morphologically characterized. The ascomycete Guignardia mangiferae and strains of Mycelia sterilia were prevalent in the isolations. The unequivocal identification of Guignardia mangiferae at a probabilistic degree close to 100% was carried out by DNA extraction followed by PCR analyses of the ITS-1 and ITS-2 regions and comparison of the genetic sequence with the NCBI database.展开更多
基金This study was financially supported by the National Natural Science Foundation of China(Grant No.31670393 and 32270310).
文摘Mistletoes are ecologically important parasitic plants,with> 1600 species from five lineages worldwide.Mistletoe lineages exhibit distinct patterns of species diversification and host specificity,however,the mechanisms underlying these differences are poorly understood.In this study,we analysed a comprehensive parasite-host network,including 280 host species from 60 families and 22 mistletoe species from two lineages(Santalaceae and Loranthaceae) in Xishuangbanna,located in a biodiversity hotspot of tropical Asia.We identified the factors that predict the infection strength of mistletoes.We also detected host specificity and the phylogenetic signal of mistletoes and their hosts.We found that this interaction network could be largely explained by a model based on the relative abundance of species.Host infection was positively correlated with diameter at breast height and tree coverage,but negatively correlated with wood density.Overall,closely related mistletoe species tend to interact more often with similar hosts.However,the two lineages showed a significantly different network pattern.Rates of host generality were higher in Loranthaceae than in Santalaceae,although neither lineage showed phylogenetic signal for host generality.This study demonstrates that the neutral interaction hypothesis provides suitable predictions of the mistletoe-host interaction network,and mistletoe species show significant phylogenetic signals for their hosts.Our findings also indicate that high species diversification in Loranthaceae may be explained by high rates of host generality and the evolutionary history shared by Loranthaceae species with diverse host plants in the tropics.
文摘Endophytic fungi were identified from different parts of the medicinal parasitic mistletoe Cladocolea micrantha and from its host Anacardium occidentale, suggesting a strict host-parasite relationship. Eight fungal endophytes were isolated and morphologically characterized. The ascomycete Guignardia mangiferae and strains of Mycelia sterilia were prevalent in the isolations. The unequivocal identification of Guignardia mangiferae at a probabilistic degree close to 100% was carried out by DNA extraction followed by PCR analyses of the ITS-1 and ITS-2 regions and comparison of the genetic sequence with the NCBI database.
