Tree and Forest Health
Online ISSN : 2189-7204
Print ISSN : 1344-0268
ISSN-L : 1344-0268
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Physiological and morphological properties in leaves of top-dieback trees of Cercidiphyllum japonicum Makino
Ayumi Tanaka-OdaYujiro NoguchiToshihiro UmebayashiEmi MatsumuraAi AkamiKenzo TanakaKenji Fukuda
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2011 Volume 15 Issue 4 Pages 139-146

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Abstract

Top-dieback has often been reported in Cercidiphyllum japonicum trees planted in urban area. To clarify the mechanism of the dieback, leaf physiological and morphological characteristics of top-dieback trees were compared with healthy trees. We studied seasonal changes in leaf physiological properties and shoot morphology among upper and lower parts of the crown in healthy and top-dieback trees. In top-dieback trees, leaves at both upper and lower crown showed -0.1 MPa lower predawn water potential than in healthy trees throughout the growth period from May to September. Upper crown leaves of top-dieback trees also showed reduction in maximum photosynthetic rate and increase in dark respiration rate compared to lower crown leaves in top-dieback trees and the both leaves of healthy trees from the end of July. Individual leaf area was also smaller in the shoots of upper crown of top-dieback trees, while shoot growth was greater in lower crown in top-dieback trees than in healthy trees. These results indicated that chronic drought stress and reduction of photosynthesis in leaves at the upper crown of top-dieback trees are the major factors to cause of top-dieback of Cercidiphyllum japonicum trees in urban areas.

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© 2011 Tree Health Research Society, Japan
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