Is precipitation a trigger for the onset of xylogenesis in Juniperus przewalskii on the north-eastern Tibetan Plateau?

Annals of Botany
Ping RenKatarina Čufar

Abstract

A series of studies have shown that temperature triggers the onset of xylogenesis of trees after winter dormancy. However, little is known about whether and how moisture availability influences xylogenesis in spring in drought-prone areas. Xylogenesis was monitored in five mature Qilian junipers (Juniperus przewalskii) by microcore sampling from 2009 to 2011 in a semi-arid area of the north-eastern Tibetan Plateau. A simple physical model of xylem cell production was developed and its sensitivity was analysed. The relationship between climate and growth was then evaluated, using weekly wood production data and climatic data from the study site. Delayed onset of xylogenesis in 2010 corresponded to a negative standardized precipitation evapotranspiration index (SPEI) value and a continuous period without rainfall in early May. The main period of wood formation was in June and July, and drier conditions from May to July led to a smaller number of xylem cells. Dry conditions in July could cause early cessation of xylem differentiation. The final number of xylem cells was mainly determined by the average production rate rather than the duration of new cell production. Xylem growth showed a positive and significant response to precip...Continue Reading

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Citations

Dec 15, 2015·Plant, Cell & Environment·Lorena BalducciSergio Rossi
Jun 21, 2017·Proceedings of the National Academy of Sciences of the United States of America·Bao YangJussi Grießinger
Jun 28, 2017·Tree Physiology·Andrea Winkler, Walter Oberhuber
Nov 7, 2019·International Journal of Biometeorology·Dina F ZhirnovaEugene A Vaganov
Aug 8, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jian-Guo HuangEmanuele Ziaco
Feb 27, 2016·Tree Physiology·Emanuele ZiacoAnnie Deslauriers
Apr 7, 2021·Tree Physiology·Kiyomi MorinoMalcolm K Hughes

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