Effects of salicylic acid, 1‐aminocyclopropan‐1‐carboxylic acid and methyl jasmonate on the frequencies of endophytic fungi in Quercus serrata leaves
To examine the effects of salicylic acid (SA), the ethylene precursor 1‐aminocyclopropan‐1‐carboxylic acid (ACC) and methyl jasmonate (MJ), which induce defence responses against pathogen in plants, on foliar endophytic fungi, we performed exogenous treatments of Quercus serrata leaves with these chemicals and subsequently isolated endophytic fungi. SA and ACC significantly reduced the isolation frequency of the most dominant fungus, a Xylaria species as identified by sequence analysis of the internal transcribed spacer (ITS) region of the ribosomal DNA. In contrast, the frequency of the second most frequent fungus increased by SA and ACC. A few other fungi were also affected positively or negatively. Shannon diversity indices decreased by all treatments because of the uneven isolation frequencies of the endophytes. Our results imply that host defence responses induced by the chemical treatments reduced the number of infections of some endophytes while the frequency of some other endophytes increased benefiting from the reduction of competitors.
Document Type: Research Article
Affiliations: Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, Japan
Publication date: October 1, 2012