Photosynthetica 2007, 45(1):70-74 | DOI: 10.1007/s11099-007-0011-7

Different photosynthetic responses of wild and cultivated plants to high irradiance

N. Kumar1, S. Kumar1,*, P. S. Ahuja1
1 Institute of Himalayan Bioresource Technology, Biotechnology Division, Palampur, India

In addition to other factors, high altitude (HA) environment is characterized by high photosynthetic photon flux density (PPFD). Photosynthetic characteristics of wild and cultivated plants were studied at different irradiances at Losar, India (altitude 4 200 m). Wild plants were tolerant to high PPFDs. Slopes of curve between net photosynthetic rate (P N) and intercellular CO2 concentration (C i) or stomatal conductance (g s) increased with increase in irradiance suggesting insensitivity or tolerance of these plants to higher PPFD. Cultivated plants, however, were sensitive to higher PPFD, their slopes of curves between P N and C i or g s decreased with increased PPFD. Tolerance or insensitivity to higher PPFD was an important parameter affecting plant performance at HA.

Additional key words: Aquilegia; Hordeum; intercellular CO2 concentration; irradiance; photosynthetic photon flux density; Pisum; Rumex; species differences; stomatal conductance

Received: March 31, 2006; Accepted: June 16, 2006; Published: March 1, 2007  Show citation

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Kumar, N., Kumar, S., & Ahuja, P.S. (2007). Different photosynthetic responses of wild and cultivated plants to high irradiance. Photosynthetica, 45(1), 70-74. doi: 10.1007/s11099-007-0011-7
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