Gas Exchange Characteristics of the Flue-Cured Tobacco (Nicotiana Tabacum L.) Cultivars Grown under Two Production Systems |
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| Authors: | Srinivas P Smith BN Swamy PM |
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| Institution: | (1) Research Department, ITC Ltd - ILTD Division, Huccumpeta (P.O.), Rajahmundry, 533 103, A.P., India;(2) Department of Botany and Range Science, Brigham Young University, Provo, Utah, USA |
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| Abstract: | The net photosynthetic rate (P
N), intercellular CO2 concentration (C
i), stomatal conductance (g
s), transpiration rate (E), water use efficiency (WUE), and leaf biomass production of four American flue-cured tobacco (Nicotiana tabacum L.) cultivars K 326, K 358, and Speight G 28 were compared with three local Indian cultivars 16/103, Special FCV, and PCT-7, during 1994 and 1995 crop seasons under irrigated and rainfed production systems (Northern light soils, NLS, and Karnataka light soils, KLS) in India. By comparison, the American tobacco cv. K 326 showed the highest P
N and g
s. A positive correlation was found between P
N and biomass production in all the varieties tested (r = 0.55 in NLS and 0.73 in KLS). The American cultivars were superior than the local cultivars in their biomass production and P
N under Indian farming conditions. |
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| Keywords: | intercellular CO2 concentration leaf biomass net photosynthetic rate stomatal conductance transpiration rate water use efficiency |
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