RossiRathgeberDeslauriers2009

Référence

Rossi, S., Rathgeber, C.B.K. and Deslauriers, A. (2009) Comparing needle and shoot phenology with xylem development on three conifer species in Italy. Annals of Forest Science, 66(2):206p1-206p8. (Scopus )

Résumé

· Since the 1960s biologists have been trying to assess factors affecting cambial activity and latewood formation. A comparison of the phenology of the apical and lateral meristems could add new clues in order to understand mechanisms of the growth dynamic in conifers. · This study compared needle and shoot growth with xylogenesis in Larix decidua, Pinus cembra and Picea abies during 2001 to verify if cambial resumption occurred after shoot and needle growth had begun, and if latewood initiation occurred when shoot lengthening was complete. · In pine and spruce, needle and shoot lengthening was synchronous between mid-June and August while larches showed an early development of the needles at the end of May with a later shoot lengthening. Cell production lasted from mid-May to the beginning of August, with the first differentiating cells observed at the end of May, which indicated a earlier reactivation of the cambium with respect to needle and shoot growth. The first latewood cells began wall thickening between July and August, during the termination of needle and shoot lengthening. · The hypothesis that cambial resumption occurs after shoot and needle elongation was rejected. The separation in time between apical growth and secondary wall thickening of latewood suggested the presence of an internal competition in resource allocation. © 2009 INRA EDP Sciences.

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@ARTICLE { RossiRathgeberDeslauriers2009,
    AUTHOR = { Rossi, S. and Rathgeber, C.B.K. and Deslauriers, A. },
    TITLE = { Comparing needle and shoot phenology with xylem development on three conifer species in Italy },
    JOURNAL = { Annals of Forest Science },
    YEAR = { 2009 },
    VOLUME = { 66 },
    PAGES = { 206p1-206p8 },
    NUMBER = { 2 },
    NOTE = { cited By 26 },
    ABSTRACT = { · Since the 1960s biologists have been trying to assess factors affecting cambial activity and latewood formation. A comparison of the phenology of the apical and lateral meristems could add new clues in order to understand mechanisms of the growth dynamic in conifers. · This study compared needle and shoot growth with xylogenesis in Larix decidua, Pinus cembra and Picea abies during 2001 to verify if cambial resumption occurred after shoot and needle growth had begun, and if latewood initiation occurred when shoot lengthening was complete. · In pine and spruce, needle and shoot lengthening was synchronous between mid-June and August while larches showed an early development of the needles at the end of May with a later shoot lengthening. Cell production lasted from mid-May to the beginning of August, with the first differentiating cells observed at the end of May, which indicated a earlier reactivation of the cambium with respect to needle and shoot growth. The first latewood cells began wall thickening between July and August, during the termination of needle and shoot lengthening. · The hypothesis that cambial resumption occurs after shoot and needle elongation was rejected. The separation in time between apical growth and secondary wall thickening of latewood suggested the presence of an internal competition in resource allocation. © 2009 INRA EDP Sciences. },
    AUTHOR_KEYWORDS = { Cambium; Cell differentiation; Latewood; Microcore; Timberline },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1051/forest/2008088 },
    KEYWORDS = { cell organelle; coniferous tree; evergreen tree; growth; phenology; resource allocation; shoot; treeline; xylem, Eurasia; Europe; Italy; Southern Europe, Coniferophyta; Larix; Larix decidua; Picea; Picea abies; Pinus cembra },
    SOURCE = { Scopus },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-61849181495&partnerID=40&md5=050ff9af6c5a5a6011a5bbb0fda02a92 },
}

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