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Auxin concentration and xylem production of Pinus massoniana in a subtropical forest in south China

Guo Xiali, Huang Jian-Guo, Butto Valentina, Luo Dawei, Shen Chunyu, Li Jingye, Liang Hanxue, Zhang Shaokang, Hou Xingliang, Zhao Ping et Rossi Sergio. (2021). Auxin concentration and xylem production of Pinus massoniana in a subtropical forest in south China. Tree Physiology, 42, (2), p. 317-324.

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URL officielle: http://dx.doi.org/doi:10.1093/treephys%2Ftpab110

Résumé

Auxin is involved in various developmental processes of plants, including cell division in cambium and xylem differentiation. However, most studies linking auxin and xylem cell production are performed in environments with a strong seasonality (i.e., temperate and boreal climates). The temporal dynamics of auxin and cambial activity of subtropical trees remain basically unknown. In this study, we sampled four microcores weekly in three individuals of Chinese red pine (Pinus massoniana Lamb.) from February to December 2015–16 to compare xylem formation with auxin concentration in subtropical China. During the entire period of sampling, the number of cambial cells varied from 2 to 7, while the number of cells in the enlarging zone ranged from 1 to 4 and from 1 to 5 in the wall-thickening zone. In 2015, the average auxin concentration was 3.46 ng g−1, with 33 xylem cells being produced at the end of the year. In 2016, a lower auxin concentration (2.59 ng g−1) corresponded to a reduced annual xylem production (13.7 cells). No significant relationship between auxin concentration and number of xylem cells in differentiation was found at the weekly scale. Unlike in boreal and temperate forests, the lack of wood formation seasonality in subtropical forests makes it more difficult to reveal the relationship between auxin concentration and number of xylem cells in differentiation at the intra-annual scale. The frequent and repeated samplings might have reduced auxin concentration in the developing cambium and xylem, resulting in a lower xylem cell production.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1758-4469
Volume:42
Numéro:2
Pages:p. 317-324
Version évaluée par les pairs:Oui
Date:2021
Identifiant unique:10.1093/treephys/tpab110
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:auxin, cambium, conifer trees, subtropical forest, xylem, Pinus massoniana
Déposé le:05 juin 2023 14:17
Dernière modification:05 juin 2023 14:17
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