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Pine wilt disease causes cavitation around the resin canals and irrecoverable xylem conduit dysfunction.
Yazaki, Kenichi; Takanashi, Takuma; Kanzaki, Natsumi; Komatsu, Masabumi; Levia, Delphis F; Kabeya, Daisuke; Tobita, Hiroyuki; Kitao, Mitsutoshi; Ishida, Atsushi.
Afiliación
  • Yazaki K; Department of Plant Ecology, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, Japan.
  • Takanashi T; Department of Forest Entomology, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, Japan.
  • Kanzaki N; Kansai Research Center, Forestry and Forest Products Research Institute (FFPRI), Kyoto, Japan.
  • Komatsu M; Department of Mushroom Science and Forest Microbiology, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, Japan.
  • Levia DF; Departments of Geography and Plant & Soil Science, University of Delaware, USA.
  • Kabeya D; Department of Plant Ecology, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, Japan.
  • Tobita H; Department of Plant Ecology, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, Japan.
  • Kitao M; Hokkaido Research Center, Forestry and Forest Products Research Institute (FFPRI), Sappro, Japan.
  • Ishida A; Center for Ecological Research, Kyoto University, Otsu, Japan.
J Exp Bot ; 69(3): 589-602, 2018 01 23.
Article en En | MEDLINE | ID: mdl-29240955
Physiological mechanisms of irreversible hydraulic dysfunction in seedlings infected with pine wilt disease (PWD) are still unclear. We employed cryo-scanning electron microscopy (cryo-SEM) to investigate the temporal and spatial changes in water distribution within the xylem of the main stem of 2-year-old Japanese black pine seedlings infested by pine wood nematodes (PWNs). Our experiment was specifically designed to compare the water relations among seedlings subjected to the following water treatment and PWN combinations: (i) well-watered versus prolonged drought (no PWNs); and (ii) well-watered with PWNs versus water-stressed with PWNs (four treatments in total). Cryo-SEM imaging observations chronicled the development of patchy cavitations in the xylem tracheids of the seedlings influenced by PWD. With the progression of drought, many pit membranes of bordered pits in the xylem of the main stem were aspirated with the decrease in water potential without xylem cavitation, indicating that hydraulic segmentation may exist between tracheids. This is the first study to demonstrate conclusively that explosive and irreversible cavitations occurred around the hydraulically vulnerable resin canals with the progression of PWD. Our findings provide a more comprehensive understanding of stressors on plant-water relations that may eventually better protect trees from PWD and assist with the breeding of trees more tolerant to PWD.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Enfermedades de las Plantas / Tylenchida / Pinus / Xilema / Sequías Tipo de estudio: Etiology_studies Límite: Animals Idioma: En Revista: J Exp Bot Asunto de la revista: BOTANICA Año: 2018 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Enfermedades de las Plantas / Tylenchida / Pinus / Xilema / Sequías Tipo de estudio: Etiology_studies Límite: Animals Idioma: En Revista: J Exp Bot Asunto de la revista: BOTANICA Año: 2018 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido