Comparison of QTLs mapped in RILs and their test-cross progenies of tropical maize for insect resistance and agronomic traits

Groh, S and Khairallah, M M and Hoisington, D A and et al, . (1998) Comparison of QTLs mapped in RILs and their test-cross progenies of tropical maize for insect resistance and agronomic traits. Plant Breeding, 117. pp. 193-202. ISSN 0179-9541

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Abstract

QuantItatIve traIt lOCI (QTL) affectlllg resIstance to south-western corn borer Dzatraea grandzosella (SWCB) and sugarcane borer Dzatraea saccharalzs (SCB) have been Identmed prevIOusly III F 23 lInes and recomblllant Illbred lInes (RILs) of tropIcal maJ.Ze uSlllg restnctlOn fragment length polymorphIsm (RFLP) analyses. Our 0 bJectlve was to detenrune whether QTLs IdentIfied III these generatIOns are also expressed III testcrosses (TC) of RILs A population of 166 TC progemes was developed by crosslllg RILs from the cross CML131 (susceptIble) x CML67 (resIstant) WIth the unrelated, susceptIble tester lIne CML216. ReSIstance to first-generatIOn SWCB, measured as leaf-feedmg damage (LFD) under artIfiCIal mfestatlOn, and other agronomIc traIts were evaluated m two envIronments for the TC progemes and three enVIronments for 183 RILs The correlatIon between Ime per se and TC performance was low for LFD and mtermeruate for most agronormc traIts EstImates of the genotYPIc vanance and hentabllItIes were smaller m the TC progemes than m the RILs for all traIts QuantItatIve traIt lOCI were IdentIfied usmg an RFLP Imkage map WIth 136 lOCI For LFD, four QTLs were detected m the TC progemes, of whIch two were m common WIth nme QTLs preVIously mapped m the RILs Few QTLs for agronolillc traits were common to the two types of progeny, because of the low consIstency of QTL pOSItIons for all traIts m RIL and TC progemes, the use of TC progemes should be conSIdered m QTL mappmg sturues as the first step for marker-assIsted selectIOn m hybnd breedmg

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Diatraea grandzosella, Zea mays, host plant,reSIstance, lIne per se performance, QTL mappmg, RFLP, test-cross performance
Subjects:	Others > Maize
Depositing User:	Mr. Thimma Reddy
Date Deposited:	19 Mar 2012 08:53
Last Modified:	19 Mar 2012 08:53
URI:	http://oar.icrisat.org/id/eprint/5761
Official URL:
Projects:	UNSPECIFIED
Funders:	Vater und Sohn Eiselen Stiftung', Ulm, Germany
Acknowledgement:	[NOTE: D. A. Hoisington is presently with ICRISAT (Patancheru)]---The authors thank Dr D. Bergvinson for insect supply and Dr D. Beck for his help with the field trials. The assistance of E. Bahena and S Pastrana with the field experiments is gratefully acknowledged. We also thank Dr M. Bohn for his contribution to this work and the critical review of the manuscript.
Links:	Author

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