LiRossiLiang2019

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Li, X., Rossi, S., Liang, E. (2019) The onset of xylogenesis in Smith fir is not related to outer bark thickness. American Journal of Botany, 106(10):1386-1391. (Scopus )

Résumé

Premise: The resumption of stem growth varies across the ontogenetic development of trees. Compared with younger trees, older ones have thicker outer bark with a temperature-insulating effect that could potentially prevent the stem from warming in the spring. However, the question of whether xylogenesis in old trees is influenced by the thick bark still remains unresolved. Methods: We investigated the onset of xylogenesis across the ontogenetic development of Smith fir (Abies georgei var. smithii) trees in the Sygera Mountains, southeastern Tibetan Plateau. The outer bark of older trees was also removed. Xylogenesis was monitored in microcores we collected every 3 days during May and June in 2017. Results: Xylogenesis began in late May in young (<50 yr) and mature (50–100 yr) trees, 1 week earlier than in adult (>100–150 yr) and old (>150–200 yr) trees. Older (>200 yr) trees had the latest onset of xylogenesis, 2 weeks after young trees. The resumption of xylogenesis was similar between the control and bark-removed trees. Conclusions: Growth resumption was delayed in older and bigger trees. Outer bark did not affect the onset of xylogenesis, which indicated that the delayed resumption of growth during the lifespan of trees could be more related to endogenous factors than to an insulating effect of the thick bark of older individuals. © 2019 Botanical Society of America

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@ARTICLE { LiRossiLiang2019,
    AUTHOR = { Li, X. and Rossi, S. and Liang, E. },
    TITLE = { The onset of xylogenesis in Smith fir is not related to outer bark thickness },
    JOURNAL = { American Journal of Botany },
    YEAR = { 2019 },
    VOLUME = { 106 },
    NUMBER = { 10 },
    PAGES = { 1386-1391 },
    NOTE = { cited By 0 },
    ABSTRACT = { Premise: The resumption of stem growth varies across the ontogenetic development of trees. Compared with younger trees, older ones have thicker outer bark with a temperature-insulating effect that could potentially prevent the stem from warming in the spring. However, the question of whether xylogenesis in old trees is influenced by the thick bark still remains unresolved. Methods: We investigated the onset of xylogenesis across the ontogenetic development of Smith fir (Abies georgei var. smithii) trees in the Sygera Mountains, southeastern Tibetan Plateau. The outer bark of older trees was also removed. Xylogenesis was monitored in microcores we collected every 3 days during May and June in 2017. Results: Xylogenesis began in late May in young (<50 yr) and mature (50–100 yr) trees, 1 week earlier than in adult (>100–150 yr) and old (>150–200 yr) trees. Older (>200 yr) trees had the latest onset of xylogenesis, 2 weeks after young trees. The resumption of xylogenesis was similar between the control and bark-removed trees. Conclusions: Growth resumption was delayed in older and bigger trees. Outer bark did not affect the onset of xylogenesis, which indicated that the delayed resumption of growth during the lifespan of trees could be more related to endogenous factors than to an insulating effect of the thick bark of older individuals. © 2019 Botanical Society of America },
    AFFILIATION = { Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; Département des Sciences Fondamentales, Laboratoire d’Écologie Végétale, University of Quebec in Chicoutimi, 555, Boulevard de l'Université, Chicoutimi, QC G7H2B1, Canada; Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China },
    AUTHOR_KEYWORDS = { cambium; cell differentiation; dendroecology; manipulative experiment; ontogeny; secondary phloem; subalpine forest; tree ring; wood formation; xylem growth },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1002/ajb2.1360 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073446406&doi=10.1002%2fajb2.1360&partnerID=40&md5=2ed95f89ed089ac51e9397af069005a6 },
}

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