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Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China

The climatic signals that directly affect the trees can be registered by xylem during its growth. If the timings and duration of xylem formation change, xylogenesis can occur under different environmental conditions and subsequently be subject to different climatic signals. An experimental design wa...

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Autores principales: Zeng, Qiao, Rossi, Sergio, Yang, Bao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5771374/
https://www.ncbi.nlm.nih.gov/pubmed/29379517
http://dx.doi.org/10.3389/fpls.2017.02264
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author Zeng, Qiao
Rossi, Sergio
Yang, Bao
author_facet Zeng, Qiao
Rossi, Sergio
Yang, Bao
author_sort Zeng, Qiao
collection PubMed
description The climatic signals that directly affect the trees can be registered by xylem during its growth. If the timings and duration of xylem formation change, xylogenesis can occur under different environmental conditions and subsequently be subject to different climatic signals. An experimental design was applied in the field to disentangle the effects of age and size on xylem phenology, and it challenges the hypothesis that the timings and dynamics of xylem growth are size-dependent. Intra-annual dynamics of xylem formation were monitored weekly during the growing seasons 2013 and 2014 in Chinese pine (Pinus tabulaeformis) and Qilian juniper (Juniperus przewalskii) with different sizes and ages in a semi-arid region of northwestern China. Cell differentiation started 3 weeks earlier in 2013 and terminated 1 week later in 2014 in small-young pines than in big-old pines. However, differences in the timings of growth reactivation disappeared when comparing the junipers with different sizes but similar age. Overall, 77 days were required for xylem differentiation to take place, but timings were shorter for older trees, which also exhibited smaller cell production. Results from this study suggest that tree age does play an important role in timings and duration of growth. The effect of age should also be considered to perform reliable responses of trees to climate.
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spelling pubmed-57713742018-01-29 Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China Zeng, Qiao Rossi, Sergio Yang, Bao Front Plant Sci Plant Science The climatic signals that directly affect the trees can be registered by xylem during its growth. If the timings and duration of xylem formation change, xylogenesis can occur under different environmental conditions and subsequently be subject to different climatic signals. An experimental design was applied in the field to disentangle the effects of age and size on xylem phenology, and it challenges the hypothesis that the timings and dynamics of xylem growth are size-dependent. Intra-annual dynamics of xylem formation were monitored weekly during the growing seasons 2013 and 2014 in Chinese pine (Pinus tabulaeformis) and Qilian juniper (Juniperus przewalskii) with different sizes and ages in a semi-arid region of northwestern China. Cell differentiation started 3 weeks earlier in 2013 and terminated 1 week later in 2014 in small-young pines than in big-old pines. However, differences in the timings of growth reactivation disappeared when comparing the junipers with different sizes but similar age. Overall, 77 days were required for xylem differentiation to take place, but timings were shorter for older trees, which also exhibited smaller cell production. Results from this study suggest that tree age does play an important role in timings and duration of growth. The effect of age should also be considered to perform reliable responses of trees to climate. Frontiers Media S.A. 2018-01-12 /pmc/articles/PMC5771374/ /pubmed/29379517 http://dx.doi.org/10.3389/fpls.2017.02264 Text en Copyright © 2018 Zeng, Rossi and Yang. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Zeng, Qiao
Rossi, Sergio
Yang, Bao
Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China
title Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China
title_full Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China
title_fullStr Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China
title_full_unstemmed Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China
title_short Effects of Age and Size on Xylem Phenology in Two Conifers of Northwestern China
title_sort effects of age and size on xylem phenology in two conifers of northwestern china
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5771374/
https://www.ncbi.nlm.nih.gov/pubmed/29379517
http://dx.doi.org/10.3389/fpls.2017.02264
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