Original Articles

Preliminary studies on the inheritance of atrazine tolerance in maize (Zea mays L.)

Published in: South African Journal of Plant and Soil
Volume 3, issue 1, 1986 , pages: 27–30
DOI: 10.1080/02571862.1986.10634181
Author(s): M.R. Le Court De BillotDepartment of Plant Production,, A.P. FourieDepartment of Plant Production,, P.C. NelDepartment of Plant Production,

Abstract

Thirty-three maize (Zea mays L.) inbreds were screened for tolerance to atrazine (2-chloro-4-ethylamino-6- isopropylamino-1,3,5-triazine) in a glasshouse using a sand culture technique. Tolerance ranged from 95,7–51,0% of the control. The continuous pattern of tolerance exhibited by the inbreds indicated polygenic inheritance. Six inbreds categorized as either highly tolerant or less tolerant were hybridized in all possible combinations. The six inbreds and Fl crosses were evaluated for tolerance to atrazine (6 p.p.m. v/v) under controlled conditions. Leaf mass data strongly suggested additive gene effects. Broad-sense heritability (0,66) indicated the potential for increasing hybrid tolerance to atrazine by breeding. The nature of gene action could not be established when veinal chlorosis was used as a measure of atrazine toxicity.

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