The combined effects of phosphorus and zinc on antioxidant enzyme activity and growth attributes of potato under water deficit conditions

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The combined effects of phosphorus and zinc on antioxidant enzyme activity and growth attributes of potato under water deficit conditions

Mahdi Mirashzadeh, Mostafa Valizadeh,Rahim Motalebifard,Nosratollah Najafia3 Mahdi Taghizadegan, Mozhgan Shirinpour, ShahinUstan
J. Bio. Env. Sci.7( 6), 162-174, December 2015.
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This investigation wasconductingas a factorial experimentbased on randomized completeblocks design. The factors were zinc (Zn)at three levels (0,10 and20 mgZn perkgdry soil as zinc sulfate),phosphorus (P) at three levels (0,30 and60 mg P per kgdry soil as monocalcium phosphate) andsoil moisture at three levels (50-60% FC, 70-80% FC and 90-100% FC) with three replications. The growth attributes of potato such as, chlorophyll index, stomatal conductivity (SC), relative water content (RWC) and enzyme activityof superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) were measured during growth period.The results showed that the drought stress resulted in a significant decrease in POX and SOD, stomatal conductivity,chlorophyll index and RWC. Application of P increased significantly the stomatal conductivity and SOD. Application of Zn also affected significantly thechlorophyll index, stomatal conductivity and POX. The P×soil moisture and Zn×soil moisture two-way interactions effects were significant for stomatal conductivity and POX. The P×Zn×soilmoisture interactionhad significant effect for chlorophyll index, stomatalconductivity. The results showed that the two way interactions of Zn, P and soil moisture were mainly synergistic on above-mentionedattributes. In general, to achieve the optimum growth of potato in similar soils, recommended application of 20 mg Zn and 30 mg P perkgdry soil under normal irrigation conditions and applicationof 20 mg Zn and 60 mg P perkgdry soilat water deficit conditions.


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