Journal of Food, Agriculture and Environment

Association of yield and flag leaf photosynthesis among wheat RILs under drought condition

Author(s):

Mohammad Reza Azimi ^1*, Hoshang Alizadeh ¹, Ghasem Hosseini Salekdeh ², Mohammad Reza Naghavi ¹

Recieved Date: 2010-02-09, Accepted Date: 2010-04-03

Abstract:

Drought stress is one of the major limitations to crop productivity. To develop crop plants with enhanced tolerance of drought stress, a basic understanding of physiology is essential. The objective of this study was to investigate the possible physiological basis of high yield of the wheat RILs. We thus compared photosynthetic capacity of flag leaves and tolerance to drought stress between the wheat RILs and its parents. Agronomic and physiological traits were measured on young flag leaves of full grown plants of both stressed and non stressed treatments at an early (EGF) and late (LGF) grain-filling stage. The responses of A_n, g_s, and C_i in this study make clear that drought stress significantly decreases photosynthesis rate. Compared with C_i, A_n and g_s was found to be more sensitive to the drought stress.

Keywords:

Photosynthesis, drought stress, flag leaf, stomatal conductance, intercellular CO₂ concentration

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Agriculture
Pages: 409-411

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