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Mechanism of cavitation development in the pine wilt disease
Author(s) -
Kuroda K.
Publication year - 1991
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1991.tb00947.x
Subject(s) - xylem , tracheid , cavitation , bursaphelenchus xylophilus , terpene , wilt disease , botany , biology , chemistry , nematode , ecology , biochemistry , physics , mechanics
Volatile terpenes increase in xylem tissue after infection of Pinus thunbergii with the pine wood nematode ( Bursaphelenchus xylophilus ). The role of these terpenes in traeheid cavitation, which blocks xylem‐sap ascent and leads to water deficit in pine trees, was assessed. Volatile terpene concentration increased long before initiation of tracheid cavitation. After the volatile terpenes reached the highest concentration, severe cavitation developed. Direct injection of α‐pinene into healthy pine trunks formed artificial cavitation in xylem. These observations support the hypothesis that excessively produced volatiles, which are hydrophobic and have lower surface tension than water can promote tracheid cavitation in pine wilt disease.