|Author:||Ajayakumar, K. ; Kumar, R. R.|
|Book Group Author:||NA|
An experiment was conducted to determine the effect of irrigation on the physiological and biochemical constituents using field grown drought tolerant (UPASI 9) and drought susceptible (UPASI 3) tea cultivars. The treatments were trickle irrigation at 2.0 mm twice a week and no irrigation (the control). UPASI 9 possessed higher epicuticular wax quantity compared to UPASI 3. The relative water content (RWC) of the cultivars under irrigated conditions was more than under non-irrigated conditions. Moisture stress influenced RWC significantly, which affected photosynthetic carbon assimilation in both the cultivars. The mean values of photosynthetic rate showed that irrespective of soil moisture regime, UPASI 3 assimilated more atmospheric carbon dioxide than UPASI 9 plants. A decline in chlorophyll fluorescence values was observed, where irrigated plants recorded higher values than the control. The photochemical reactions of chlorophyll pigments were affected by moisture stress. The total chlorophyll content significantly declined in the control. Dark green coloured leaves or UPASI 9 recorded higher total chlorophyll content than UPASI 3. Proline accumulation was observed in leaves of the control plants, while irrigated plants showed accumulation of root carbohydrates.
|Journal:||Newsletter - UPASI Tea Research Foundation|
carbohydrates, chemical composition, chlorophyll, cultivars,drought resistance, leaves, photosynthesis, plant composition, plantpigments, plant water relations, proline, roots, tea, trickleirrigation, varietal susceptibility, varietal tolerance, water content,Camellia sinensis, Camellia, Theaceae, Theales, dicotyledons,angiosperms, Spermatophyta, plants, eukaryotes, carbon assimilation,carbon dioxide fixation, chemical constituents of plants, cultivatedvarieties, drought tolerance, saccharides, Horticultural Crops (FF003)(New March 2000), Plant Composition (FF040), Plant Water Relations(FF062), Plant Production (FF100), Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management]