HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Brown, J. S. Articles by Schnell, R. J. Search for Related Content PubMed Articles by Brown, J. S. Articles by Schnell, R. J. Agricola Articles by Brown, J. S. Articles by Schnell, R. J. Related Collections Other Crops Plant Disease Agroforestry

CROP BREEDING & GENETICS

Mapping QTLs for Resistance to Frosty Pod and Black Pod Diseases and Horticultural Traits in Theobroma cacao L.

^a USDA-ARS, Subtropical Horticulture Research Station, 13601 Old Cutler Rd., Miami, FL 33158
^b Tropical Agricultural Research and Higher Education Center, 7170 Turrialba, Costa Rica
^c M&M Mars, Inc., c/o USDA-ARS, Subtropical Horticulture Research Station, 13601 Old Cutler Rd., Miami, FL 33158

^* Corresponding author (miajb{at}ars-grin.gov).

A heterozygous F₁ mapping population of cacao (Theobroma cacao L.) was created and evaluated for resistance to frosty pod [caused by Moniliophthora roreri (Cif. and Par.) Evans et al.], and black pod [caused by Phytophthora palmivora (Butl.) Butl.] and for five horticultural traits at CATIE in Turrialba, Costa Rica. The population consisted of 256 F₁ progeny from the cross ‘Pound 7’ x ‘UF 273’. Progeny were used to form a linkage map using 180 markers. The linkage map contained 10 linkage groups (LGs), numbered as the LG in the cacao reference map, and was used to locate putative quantitative trait loci (QTL) for resistance to the aforementioned diseases and five horticultural traits. Resistance to frosty pod was measured by internal and external pod resistance. Five QTLs for frosty pod resistance were found on three LGs, 2, 7, and 8, with UF 273 appearing to be the source of resistance. These alleles are being used for scoring progeny in ongoing cooperative marker-assisted selection projects, and constitute the first QTLs identified for frosty pod resistance. Three QTLs for black pod resistance were found on LG 4, 8, and 10, with the most favorable alleles coming from Pound 7. One QTL was found on LG 4 for average trunk growth rate, and two QTLs for height of first jorquette were identified on LGs 4 and 6. One QTL each for average trunk diameter growth and pod color was found on LG 4.

Abbreviations: AFLP, amplified fragment length polymorphism • CATIE, Tropical Agricultural Research and Higher Education Center • LG, linkage group • LOD, log likelihood score • MQM, multiple QTL mapping • PCR, polymerase chain reaction • QTL, quantitative trait locus (loci) • RGH, resistance gene homolog • SHRS, Subtropical Horticulture Research Station • SSCP, single strand conformation polymorphism • SSR, single sequence repeat