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Abstract
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| Changes in age of the hydraulic architecture of Ulmus minor and U. minor x U. pumila clones were studied and related with the tolerance to Dutch elm disease (DED). The xylem vessel dimensions and the conductivity to air of 2- to 7- year old branches were analysed and quantified. There were no obvious differences in vessel length distribution and conductivity that would explain differences in DED tolerance among the U. minor clones, or, at the taxon level, the higher DED tolerance of U. minor x U. pumila. Among the U. minor clones, the more susceptible had wider vessels and a higher maximum vessel diameter than the more tolerant clone. Relationships among vessel lengths, vessel diameters and branches sizes were highly significant, and varied between taxa. The diameter and length of vessels increased with age, and average values stabilized 1-2 years earlier for U. minor than for U. minor x pumila. Mean maximum vessel length was significantly higher for U. minor and markedly increased more with age and with maximum vessel diameter than for U. minor x pumila. With each 0.2 m increase in height up the stem, the conductivities for U. minor and U. minor x U. pumila decreased by 59 and 50%, respectively, probably due to the shortening of vessels. The implications of xylem structure for the means of pathogen movement and resistance to Dutch elm disease are discussed. | |
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International
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Si |
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JCR
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Si |
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Title
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Trees Structure and Function |
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ISBN
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0931-1890 |
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Impact factor JCR
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1,925 |
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Impact info
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|
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Volume
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27 |
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10.1007/s00468-013-0872-2 |
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Journal number
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5 |
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From page
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1239 |
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To page
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1248 |
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Month
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OCTUBRE |
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Ranking
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10/60 (Forestry) |