期刊
PLANT CELL AND ENVIRONMENT
卷 42, 期 6, 页码 1816-1831出版社
WILEY
DOI: 10.1111/pce.13528
关键词
development; hydraulic conductivity; porosity; vascular cambium; vessel diameter; vessel length; vulnerability to cavitation; water relations; xylem
资金
- Division of Human Resource Development
- Division of Integrative Organismal Systems
- National Science Foundation [HRD-1547784, IOS-1252232]
- California State University, Bakersfield
- Universidad Politecnica de Madrid
Xylem vessel structure changes as trees grow and mature. Age- and development-related changes in xylem structure are likely related to changes in hydraulic function. We examined whether hydraulic function, including hydraulic conductivity and vulnerability to water-stress-induced xylem embolism, changed over the course of cambial development in the stems of 17 tree species. We compared current-year growth of young (1-4 years), intermediate (2-7 years), and older (3-10 years) stems occurring in series along branches. Diffuse and ring porous species were examined, but nearly all species produced only diffuse porous xylem in the distal branches that were examined irrespective of their mature xylem porosity type. Vessel diameter and length increased with cambial age. Xylem became both more conductive and more cavitation resistant with cambial age. Ring porous species had longer and wider vessels and xylem that had higher conductivity and was more vulnerable to cavitation; however, these differences between porosity types were not present in young stem samples. Understanding plant hydraulic function and architecture requires the sampling of multiple-aged tissues because plants may vary considerably in their xylem structural and functional traits throughout the plant body, even over relatively short distances and closely aged tissues.
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