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Determination of photosynthetic parameters Vc max and J max for a C 3 plant (spring hulless barley) at two altitudes on the Tibetan Plateau

Agricultural and Forest Meteorology, ISSN: 0168-1923, Vol: 151, Issue: 12, Page: 1481-1487
2011
  • 32
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  • 117
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Metrics Details

  • Citations
    32
    • Citation Indexes
      32
  • Captures
    117

Article Description

On the Tibetan Plateau, the unique alpine climate factors of low air pressure, low CO 2 partial pressure and low air temperature have significant but non-explicit influences on the photosynthetic capacity of plants. To evaluate these influences, we measured the net photosynthetic rates for spring hulless barley leaves at two altitudes of 3688 m (the low altitude) and 4333 m (the high altitude), respectively. Two photosynthetic parameters—Vc max, the maximum rate of Rubisco carboxylase activity, and J max, the maximum rate of photosynthetic electron transport—were determined. The net photosynthetic rate and the photosynthetic parameters Vc max and J max were higher for leaves from plants grown at the high altitude than for those at the low altitude. Vc max and J max were approximately 24% and 22% greater, respectively, for leaves from plants grown at the high altitude. The CO 2 and air temperature at the high altitude were lower than those at the low altitude. As a consequence, plants exposed to lower CO 2 partial pressure and lower air temperature have a higher photosynthetic capacity on the Tibetan Plateau. The optimal temperatures for Vc max and J max were approximately 6.5% and 3.5% higher, respectively, in leaves from plants grown at the high altitude than those grown at the low altitude, and the ratio of J max to Vc max was 12.7% lower at the low altitude. Simulation analyses revealed that the photosynthetic capacities of plants decreased after long-term increases in CO 2 partial pressure and temperature associated with global climate change on the Tibetan Plateau.

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