• IJAZ AHMAD

• MUMTAZ HUSSAIN

• TANVEER HUSSAIN

• MISHAL IFTIKHAR

• ABDUL GHANI

• IFTIKHAR AHMAD

• MUHAMMAD IKRAM

• SADAF HONEY GHOURI

• MUJAHID HUSSAIN

تلخیص

To study physio-biochemical responses of maize cultivars (Zea mays L.) during drought stress conditions, a pot experiment was performed at Botanical Garden, Department of Botany, Agriculture University Faisalabad. Experiment was conducted with 7 maize cultivars i.e., Sadaf, Pak Afgoi, EV-1098, EV-5098, sahiwal2002, Agaiti-85, Agaiti-2002, and two drought stress (60% field capacity and control) treatments with 4 replications. The results showed that water stress significantly affected the photosynthetic rate (A) of all maize cultivars. Different maize cultivars showed differential response to water stress. In cvs. Sahiwal-2002, EV-5098 and Agaiti-2002 photosynthetic rate increased while in all other cultivars it decreased significantly. Drought stress also reduced Transpiration Rate (E), Sub – stomatal carbon dioxide (CO2) concentration (Ci), Ci/Ca ratio, Fm (maximal chlorophyll fluorescence), (fluorescence) Fv, Fv/Fo ratio and Fv/Fm ratio of all maize cultivars. However, A/E (water use efficiency) and Fo (chlorophyll fluorescence) values and Fo/Fm ratio were significantly increased with the imposition of water stress

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