Iranian Journal of Horticultural Science

Iranian Journal of Horticultural Science

Photosynthesis evaluation and Response of stomata in deficit irrigation and partial root zone drying in potato (Solanum tuberosum L.)

Document Type : Full Paper

Authors
Azam Asadi 1
Hamidreza Khazaie 2
Jafar Nabati 3
1 Former M.Sc. Student, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
2 Professor, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
3 Assistant Professor, Research Center for Plant Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
10.22059/ijhs.2018.262352.1482
Abstract
Today, due to limited of water resources, more attention is paid to the use of water storage methods. Thus, a factorial experiment was conducted in a completely randomized design with five replications in a controlled greenhouse in Ferdowsi University of Mashhad in 20017. The studied factors included three irrigation treatments (Full irrigation, deficit irrigation, partial root zone drying) and two levels of phosphate fertilizer (required amount based on soil analysis (25ppm) and adding 25% more than recommended (31ppm)). In partial root treatments, a part of the pots was under drought stress two weeks after planting, and the second part of the zone drying pots was irrigated until the beginning of flowering and 50% of flowering was applied to dry conditions. Results showed that drought stress in both flowering and 21 days after flowering caused a decrease in the physiological traits including chlorophyll content index, photosynthesis rate, stomatal conductance and transpiration rate. As the duration of drought increased, the density of stomata in the lower leaf area increased. In spite of decreasing photosynthesis and dry matter content in drought stressed plants, biomass content in partial root zone drying was higher than deficit irrigated treatment. Increased phosphorus had no significant effect on stomatal density, but at 21 days after flowering the substomatal CO2, photosynthesis rate, transpiration rate, reduced stomatal conductance, and biomass directly were related to increasing phosphorus.
Keywords
Deficit irrigation
Drought
stomatal densities
transpiration rate
Subjects
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Iranian Journal of Horticultural Science
Volume 50, Issue 3
Autumn 2019
Pages 709-722

  • Receive Date 22 July 2018
  • Revise Date 20 August 2018
  • Accept Date 11 September 2018