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Morpho-anatomical and physiological leaf traits of two alpine herbs, Podophyllum hexandrum and Rheum emodi in the Western Himalaya under different irradiances
Authors:S Pandey  N Kumar  R Kushwaha
Institution:(1) Department of Biotechnology, Institute of Himalayan Bioresource Technology, Palampur, 176 061 (H.P.), India;(2) Present address: Department of Bioinformatics & Information Technology, Shoolini Institute of Life Sciences & Business Management, The Mall, Solan, 173 212 (H.P.), India
Abstract:Morpho-anatomical leaf traits and photosynthetic activity of two alpine herbs, Podophyllum hexandrum (shade-tolerant) and Rheum emodi (light-requiring), were studied under field (PAR>2 000 μmol m−2 s−1) and greenhouse (PAR 500 μmol m−2 s−1) conditions. Mesophyll thickness, surface area of mesophyll cells facing intercellular spaces (Smes), surface area of chloroplasts facing intercellular spaces (Sc), intercellular spaces of mesophyll cells (porosity), photon-saturated rate of photosynthesis per unit leaf area (P Nmax), and ribulose-1,5-bisphosphate carboxylase/oxygenase activity decreased in the greenhouse with respect to the field and the decreases were significantly higher in R. emodi than in P. hexandrum. P. hexandrum had lower intercellular CO2 concentration than R. emodi under both irradiances. The differences in acclimation of the two alpine herbs to low irradiance were due to their highly unlikely changes in leaf morphology, anatomy, and P Nmax which indicated that the difference in radiant energy requirement related to leaf acclimation had greater impact under low than high irradiance.
Keywords:alpine plants  leaf anatomy  leaf mass per unit leaf area  leaf physiology  mesophyll  net photosynthetic rate  ribulose-1  5-bisphosphate carboxylase/oxygenase
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