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Evaluation Of Selection Indices For Drought Tolerance Of Corn Hybrid

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Evaluation Of Selection Indices For Drought Tolerance Of Corn Hybrid
International Journal of Plant Production 3 (4), October 2009
ISSN: 1735-6814 (Print), 1735-8043 (Online)
This is a refereed journal and all articles are professionally screened and reviewed.
SHORT COMMUNICATION

GUASNR www.ijpp.info Evaluation of selection indices for drought tolerance of corn
(Zea mays L.) hybrids

a

Islamic Azad University, Karaj, Iran.
Faculty of Agriculture, University of Birjand, Iran.
*Corresponding Author; E-mail: farzadpaknejad@yahoo.com

SI

b

D

A. Jafaria, F. Paknejada,*, M. Jami AL-Ahmadib

Received 22 Nov 2008; Accepted after revision 3 July 2009; Published online 17 September 2009

of

Abstract

ch

ive

Drought is one of the major problems affecting crops production, including corn, in many parts of
Iran. In order to detect drought tolerant grain corn hybrids, an experiment with twenty corn hybrids was conducted during 2006 in Qom Province, Iran, using a complete randomized block design with four replications, under optimal moisture and drought stress condition. Results showed diversity among hybrids in response to moisture conditions. BC504 and BC652 produced the highest yields and BC678 and NS504 produced the lowest yields under optimal and stress conditions, respectively.
Assessing hybrids according to some selection indices lead to introduce BC504, BC652, BC404,
KSC302, KSC320 and KSC647 as drought tolerant ones. It seems likely that Stress Tolerance Index,
Geometric Mean Productivity, and Harmonic Mean indices, which showed the highest correlation with grain yield under both optimal and stress conditions, can be used as the best indices for maize breeding programs to introduce drought tolerant hybrids.
Keywords: Corn hybrids; Drought stress; Selection index

Introduction

Ar

The corn cultivated area has been increased during recent years in Qom province
(Agricultural Organization of Qom Province, 2006). This points out the necessity of more research about this crop concerning dry climate of this region and its irregular


References: Agricultural Organization of Qom Province., 2006. Annual report of Technical Committee of Forage Crops. 65p. Clarke, J.M., De Pauw, R.M., Townley-Smith, T.M., 1992. Evaluation of methods for quantification of drought tolerance in wheat Fernandez, G.C.J., 1992. Effective selection criteria for assessing stress tolerance. In: Kuo, C.G. (Ed.), Proceedings of the International Symposium on Adaptation of Vegetables and Other Food Crops in Fischer, R.A., Maurer, R., 1978. Drought resistance in spring wheat cultivars. Part 1: grain yield response. Aust. J. Khalili, M., Kazemi, M., Moghaddam, A., Shakiba, M., 2004. Evaluation of drought tolerance indices at different growth stages of late-maturing corn genotypes Kirigwi, F.M., van Ginkel, M., Trethowan, R., Seaes, R.G., Rajaram, S., Paulsen, G.M., 2004. Evaluation of selection strategies for wheat adaptation across water regimes Moghaddam, A., Hadizadeh, M.H., 2002. Response of corn hybrids and their parental lines to drought using different stress tolerant indices Poor Midani, A., Ahmad Pour, A., 2006. Determination of the most suitable wheat irrigation interval and amount in JaafarAbad, Qom Province Rosielle, A.A., Hamblin, J., 1981. Theoretical Aspects of Selection for Yield in Stress and Non-Stress Environment Sio-Se Mardeh, A., Ahmadi, A., Poustini, K., Mohammadi, V., 2006. Evaluation of drought resistance indices under various environmental conditions
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