Pinus pumila photosynthesis is suppressed by water stress in a wind-exposed mountain site

Soichiro Nagano, Takashi Nakano, Kouki Hikosaka, Emiko Maruta

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    Wind exposure is known to have stressful effects on plant growth, particularly at high altitudes. We studied how environmental factors affected carbon assimilation in Pinus pumila needles at a wind-exposed site. Needle gas exchange rates were determined for detached shoots in the laboratory where the needles were free from field environmental stresses, and also determined for attached shoots in the field under in situ environment. There was no difference in gas exchange characteristics determined in the laboratory between shoots from the wind-exposed and the wind-protected sites, suggesting that wind exposure did not affect the photosynthetic potential. In the field, however, the photosynthetic rate of one-year-old needles (in situ Aarea) was significantly lower at the wind-exposed site than that at the wind-protected site. There was a positive correlation between the in situ Aarea and the xylem pressure potential, suggesting that water deficit caused photosynthetic suppression at the wind-exposed site. The in situ A area was lower at the wind-exposed site, even with the same electron transport rate and the same stomatal conductance. These results suggest that CO2 assimilation is suppressed by lower mesophyll CO2 conductance at the wind-exposed site. We conclude that the carbon gain is limited by water stress in wind-exposed regions.

    Original languageEnglish
    Pages (from-to)229-237
    Number of pages9
    JournalArctic, Antarctic, and Alpine Research
    Volume45
    Issue number2
    DOIs
    Publication statusPublished - 2013 May 1

    ASJC Scopus subject areas

    • Global and Planetary Change
    • Ecology, Evolution, Behavior and Systematics
    • Earth-Surface Processes

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