Effect of Exogenous Application of Hydrogen Peroxide on Water Deficit Stress in Glob Amaranth (Gomphrena globosa L.) and Ornamental Amaranth (Amaranthus tricolor L.)

Document Type : Research Paper

Authors

1 Assistant Professors, Department of Agronomy, Faculty of Agriculture, Ferdousi University of Mashhad

2 MSc. Student, Department of Horticultur, Faculty of Agriculture, Ferdousi University of Mashhad

Abstract

In order to study the effect of exogenous application of Hydrogen peroxide on water deficit stress in Glob Amaranth (Gomphrena globosa L.) and ornamental Amaranth (Amaranthustricolar L.) an experiment was conducted in greenhouse conditions. This study was designed as factorial based on completely randomized design with 3 replications. Different concentration of Hydrogen peroxide (0, 2.5 and 5 mM) for both plants and three levels of water deficiency for Glob Amaranth (after 4, 7 and 10 days) and for ornamental Amaranth (after 2, 5 and 8 days) were treated. Results showed that foliar application of Hydrogen peroxide on both plants can improve shoot and root dry weight and alleviate adverse effects of water deficiency. With increasing distances Irrigation stomatal conductance, chlorophyll index and root volume decreased significantly, so that the lowest of this characteristics was for Glob Amaranth in the irrigation interval after 10 days and for ornamental Amaranth after eight days. For both plants, interaction effects of water deficiency and Hydrogen peroxide in shoot dry weight was significant in 5% level and in electrolyte leakage, relative water content, proline and total root length was significant in 1% level. For Glob Amaranth, in control treatment (interval 4 day irrigation) with increasing Hydrogen peroxide to 2.5 mM, shoot dry weight and total root length increased 20 and 91% respectively and with increasing Hydrogen peroxide to 5 mM, chlorophyll index was increased 30.8% compared to 0 mM Hydrogen peroxide. For ornamental Amaranth, interaction between Hydrogen peroxide content and irrigation interval showed that root volume and root weight were significant in 5% level and chlorophyll index, shoot weight, stomata conductivity, electrolyte leakage, proline and root length were significant in 1% level. The final result showed that foliar application of Hydrogen peroxide decreased drought stress because of water deficiency.

Keywords

Volume 2, Issue 2 - Serial Number 2
October 2011
Pages 65-80

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