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Physiological attributes in mango (Mangifera indica L.) impacted by different CO2 and temperature fluxes under Lucknow conditions
Adaptation and Mitigation Strategies for Climate Change Resilient Horticulture. (2012)
  • Sridhar Gutam, Central Institute for Subtropical Horticulture
Abstract
The effects of different levels of CO2 (150-500 m mol mol-1) and elevated temperatures on photosynthetic rate, stomatal behaviour, transpiration in relation to flowering and fruit set in ‘Amrapali’, a regular bearing and ‘Chausa’, alternate bearing mango (Mangifera indica L) cultivars was profiled. Variation in rates of photosynthesis with CO2 concentration was recorded in both the cultivars and in ‘Amrapali’, the rate of photosynthesis increased (15.5 µmol CO2 m2 s-1) with increasing concentration of CO2 up to 450 m mol mol-1 and thereafter declined gradually, however sharp reduction (5.0 µmol CO2 m-2 s-1) was noticed in ‘Chausa’ at higher CO2 concentration. It is possible that higher CO2 concentration might have enhanced the rate of photosynthesis in ‘Amrapali’ by increasing the rate of carboxylation of Rubisco and decreased the oxygenation reaction of photorespiration. Sharp reduction in photosynthesis at higher CO2 concentration in ‘Chausa’ could be attributed to its limited sink size/ capacity to utilize the extra assimilates under elevated CO2. Significant reduction in stomatal conductance (0.05-0.27 m mol m-2 s-1), transpiration rate (1-0.5 m mol m-2 s-1) and stoma pore size (15.2 µm) with varietal differences were also recorded in both the varieties at higher CO2 levels. Similar pattern of these parameters was also observed except enhanced transpiration rate (49-75 µg cm-2 s-1) under elevated temperature (>35oC) of controlled conditions. On further analysis of data it was revealed that the flower bud initiation, bud burst, 50% flowering and fruit set were advanced by 12, 14, 19 and 22 days respectively in trees that experienced elevated temperatures (31.0-35oC) during the corresponding phenophases. However, low temperatures (6.75-10.0oC) in January, accompanied by low humidity (46.5-52.0%) delayed 50% flowering by 19 days, with higher average panicle length (25.7 cm) as compared to reduced panicle length (22.3 cm) under normal conditions. A promotive effect of elevated temperature on vegetative flushes (12.5-20.0 %) was also observed. The early emergence of panicles with faster growth, early fruit set, changes in some physiological attributes along with promotive effects on vegetative growth under elevated CO2 and temperature indicated the possibility of significant alterations in florigenic to vegetative promoter ratio during flower bud differentiation.
Keywords
  • Amrapali,
  • Chausa,
  • CO2,
  • Temperature,
  • Gas exchange,
  • Flowering,
  • Fruit set,
  • Carbon sink
Publication Date
January 29, 2012
Editor
K.S. Shivashankara, Prakash Patil, G. Selvakumar, V. Sridhar
Publisher
Director, Indian Institue of Horticultural Research
Citation Information
Sridhar Gutam. "Physiological attributes in mango (Mangifera indica L.) impacted by different CO2 and temperature fluxes under Lucknow conditions" BangaloreAdaptation and Mitigation Strategies for Climate Change Resilient Horticulture. (2012)
Available at: http://works.bepress.com/sridhar_gutam/17/