Document Detail

Interactive effects of water, light, and heat stress on photosynthesis in Fremont cottonwood.
MedLine Citation:
PMID:  23336343     Owner:  NLM     Status:  Publisher    
Fremont cottonwood seedlings are vulnerable to water stress from rapid water-table decline during river recession in spring. Water stress is usually cited as the reason for reduced establishment, but interactions of water stress with microclimate extremes are more likely causes of mortality. We assessed photosynthetic responses of Fremont cottonwood seedlings to water, light, and heat stresses, which commonly co-occur in habitats where seedlings establish. Under moderate temperature and light conditions, water stress did not affect photosynthetic function. However, stomatal closure during water stress predisposed Fremont cottonwood leaves to light and heat stress resulting in greatly reduced photosynthesis beginning at 31°C versus at 41°C for well-watered plants. Ontogenetic shifts in leaf orientation from horizontal to vertical that occur as seedlings mature reduce heat and light stress, especially during water stress. When compared to naturally occurring microclimate extremes, seedling stress responses suggest that reduced assimilation and photoprotection are common for Fremont cottonwood seedlings on exposed point bars where they establish. These reductions in photosynthesis likely have negative impacts on growth and may predispose young (<90 day old) seedlings to early mortality during rapid water-table declines. Interactions with heat and light stress are more important in these effects than water stress alone.
Emily S Tozzi; Hsien Ming Easlon; James H Richards
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-22
Journal Detail:
Title:  Plant, cell & environment     Volume:  -     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 Blackwell Publishing Ltd.
Department of Land, Air and Water Resources, University of California, One Shields Avenue, Davis, CA, 95616-8627, USA.
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