English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

–   • We investigated the effects of flooding for three weeks on physiological responses and uptake of NH4+ and NO3− by black spruce (Picea mariana (Mill.) BSP.) and tamarack (Larix laricina (Du Roi) K. Koch) seedlings fertilized with labeled (15NH4)2SO4 or K15NO3 in a growth chamber experiment.–   • Flooding reduced photosynthesis (A), transpiration (E), water use efficiency (WUE), and current uptake of NH4+ and NO3− in both species.–   • Under flooding, there were no significant differences between the two species in uptake of either NH4+ or NO3− at the whole-plant level but black spruce had higher translocation of NH4+ to the shoots than did tamarack.–   • Under non-flooded conditions, black spruce seedlings exhibited higher uptake of both NH4+ and NO3− than did tamarack and demonstrated preferential uptake of NH4+ (19. 7 mg g−1dw) over NO3− (12.3 mg g−1dw after three weeks). In contrast, non-flooded tamarack seedlings had equal uptake of NH4+ (4.96 mg g−1dw) and NO3− (4.97 mg g−1dw).–   • We hypothesize that the ability of tamarack to equally exploit both 15NH4+ and 15NO3− would confer an advantage over black spruce, when faced with limitations in the availability of different forms of soil nitrogen.

Current uptake of 15N-labeled ammonium and nitrate in flooded and non-flooded black spruce and tamarack seedlings