Fungal endophytes and epiphytes in needles of <i>Picea abies</i> (L.) Karst. from natural and urban areas in northern Italy
2006
Lorenzi E | Lorando E | Picco AM
The foliar fungal endophytes community inhabiting needles of <i>Picea abies</i> (Norway spruce) has not been well documented. In this study, carried out in Northern Italy, needles were collected in the years 2003 - 2004 in Bagni di Masino and Passo S. Marco (natural locations) and in Milano and Pavia (urban areas). Needles were plated and scored for hyphal outgrowth of endophytes to observe composition and distribution pattern. Both colonization percentage and number of <i>taxa</i> were higher in needles collected in natural locations. There was a large difference in the infection levels between natural and urban areas, portion of the needle (the distal portion showing the largest number of colonies) and among the different needle age classes, with the youngest needles being virtually endophytes free and the 5 and 6 age classes being the most colonized. Thus Norway spruce foliar endophytes population appears to be influenced by age and portion of the needle and location. In the year 2003 fungal epiphytes were also investigated to compare the two different populations. Results analisys show a different distribution of endophytic and ephyphitic <i>taxa</i>, some species being mostly isolated in the natural locations others in the urban ones, thus indicating the presence of different clusters. <i>Zythiostroma pinastri</i> and <i>Tiarosporella parca</i> were the most frequent endophytes in natural locations while <i>Sphaeropsis sapinea</i> was common in urban areas. Among the epiphytes <i>Alternaria alternata</i>, <i>Aureobasidium</i>, and <i>Cladosporium</i> were ubiquitous <i>taxa</i>, <i>Phomopsis</i> was mostly isolated in natural locations.
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