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Why photosynthesis rate is higher at sea level than that at high mountains?
Wiki User
∙ 11y ago
The partial pressure of CO2 in air decreases with the increase in altitude. Therefore,
increase in molar concentration of CO2 is smaller at higher altitudes than at lower altitudes for
increases in molar fraction of CO2. This study aimed to predict the effect of global CO2 increase
on net photosynthetic rate of spring wheat (Triticum aestivum L.) at high altitudes. The net
photosynthetic rate of spring wheat grown in Lhasa (3688 m above sea level), China, was compared
with that of the same cultivar grown in Sapporo (15 m above sea level), Japan. At the current level
of CO2, it was signifi cantly lower in Lhasa than in Sapporo, and stomatal conductance, chlorophyll
content (SPAD value) and apparent quantum yield were similar in both locations. The interaction
of CO2 level and altitude was suggested; the amount of increase in net photosynthetic rate caused
by increase in CO2 was smaller at high altitudes than at low altitudes. Lower CO2 partial pressure at
higher altitude could explain the difference in net photosynthetic rate between altitudes, and the
interaction of CO2 level and altitude.
Wiki User
∙ 11y ago
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