Journal
PLANTS-BASEL
Volume 10, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/plants10040742
Keywords
abiotic stress; forestry; plant selection; tree physiology; urban forestry
Categories
Funding
- University of Illinois Department of Natural Resources and Environmental Sciences
- University of Wisconsin - Stevens Point College of Natural Resources
- National Natural Science Foundation of China [41971122, 41861017, 31600496]
- Scholarship of Chinese Academy of Sciences for Overseas Study
- Gulf Coast Research and Education Center, University of Florida
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The study found that sugar maple seedlings from Oklahoma, Missouri, and Tennessee have higher tolerance to water stress primarily due to their higher water use efficiency (WUE) compared to other coping mechanisms.
Responses to water stress were measured for sugar maple (Acer saccharum subsp. saccharum Marshall) sources from Oklahoma (Caddo sugar maple), Missouri, Tennessee, Ontario, and a black maple (Acer saccharum subsp. nigrum F. Michx.) source from Iowa. Seedling sources were selected for differences in temperature and precipitation of their geographic origins. Seedlings were preconditioned through moist (watered daily) or dry (watered every 4-7 days) cycles and then exposed to prolonged water stress. As water stress increased, dry preconditioned 17-week-old sugar maple seedlings from Oklahoma, Missouri, and Tennessee, sources from warmer, and/or drier climates with greater restrained photosynthesis, stomatal conductance, and water use efficiency than those from cooler and moister climates. Under imposed water stress, the Ontario and Iowa sourced seedlings increased their root to shoot ratios and decreased their specific leaf area, mechanisms for drought avoidance. However, no corresponding changes in these values occurred for Oklahoma, Missouri, and Tennessee sources and for the variable of leaf wilting across all sources. Results from this study suggest greater tolerance of water stress in the Oklahoma, Missouri, and Tennessee ecotypes from the western and southern range of sugar maple resulted primarily with water use efficiency (WUE) rather than other water stress coping mechanisms. Findings from this study provide evidence to support selection of sugar maples sources for forestation.
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