Responses of stomata and xylem parenchyma cells to abrupt water disappearance in xylem of saplings infected with pine wilt disease
| Project/Area Number |
23780190
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Wood science
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| Research Institution | Forestry and Forest Products Research Institute |
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Principal Investigator |
YAZAKI Kenichi 独立行政法人森林総合研究所, 植物生態研究領域, 主任研究員 (30353890)
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| Research Collaborator |
TAKANASHI Takuma 森林総合研究所, 森林昆虫研究領域, 主任研究員 (60399376)
KANZAKI Natsumi 森林総合研究所, 森林微生物研究領域, 主任研究員 (70435585)
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 松枯れ / cryo-SEM / 木部柔細胞 / vulnerability curve / 水ポテンシャル / 光合成 / 透水係数 / A/Ci曲線 / マツノザイセンチュウ / 気孔 / 木部通水コンダクタンス / キャビテーション / 気孔反応 / 低温走査型電子顕微鏡 |
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| Outline of Final Research Achievements |
To clarify the physiological mechanism of a tree death caused by pine wilt disease, the relationship between the physiological traits of needles and the hydraulic traits of xylem in the saplings of Pinus thumbergii inoculated with pine wood nematodes was investigated. Water dynamics in tracheids was also investigated by using cryo-SEM to examine the status of parenchyma cells.
Inoculated saplings decreased in stomatal conductance with their embolisms occured from the surrounding cells of resin canals, but maintained high daily water potential (ψ) until the disease symptom was visible. No relationship between water dynamics of tracheids and the deterioration of adjacent parenchyma cells was observed. Controled saplings under ceased irrigation conserved water in tracheids despite their decreasing in ψ, and they showed recovery of gas exchanges by re-irrigation. In conclusion, abnormal embolism would not be avoided by the stomatal closure and obstruct drought resistance of pine saplings.
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Report
(5 results)
Research Products
(5 results)
