2003 Fiscal Year Final Research Report Summary
Studies on the formation of xylem embolism influencing tree survival
| Project/Area Number |
13460071
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学
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| Research Institution | Kyoto Prefectural University |
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Principal Investigator |
IKEDA Takefumi Kyoto Prefectural University, Graduate School of Agriculture, Associate Professor, 農学研究科, 助教授 (50183158)
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| Co-Investigator(Kenkyū-buntansha) |
MARUTA Emiko Toho University, Faculty of Science, Associate Professor, 理学部, 助教授 (90229609)
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| Project Period (FY) |
2001 – 2003
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| Keywords | cavitation / embolism / xylem / water stress / Pinus / alpine zone / Pinus pumila / pine wilt disease |
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| Research Abstract |
1.Vulnerability to xylem cavitation in Pinus densiflora
Decrease in water status of Bursaphelechus xylophilus infected-pine is due to losing hydraulic conductivity of xylem caused by embolism. After infection with pine wood nematodes root and stem xylems began more vulnerable to cavitation than before infection. Occurrence of embolism in B.xylophilus infected-pine is closely related to alteration of xylem vulnerability. Magnetic resonance imaging (MRI) of xylem showed that embolized area of xylem increased with development of disease and was not limited in the vicinity of nematode inoculated-portion but spread over the xylem. Xylem embolism deals pines suffered from pine wilt disease a fatal blow.
2.Vulnerability of xylem cavitation in Pinus pumila
Communities of Pinus pumila distributing in alpine zone of Mt. Norikura are divided into two types. One is healthy growing community and another is damaged community. Later is characterized that the needle color changes brown in early spring. Xylem hydraulic conductivities of P.pumila in both of communities decreased caused by cavitation during summer. In autumn xylem hydraulic conductivity of healthy P.pumila recovered but not in damaged P.pumila. In October needles of damaged trees seemed to dehydrate caused by wind because they have not covered with snow. Namely, decline of P.pumila community seems to relate to the alteration of snow depth triggered by global warming.
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