Premium
Tolerance to Fusarium verticillioides infection and fumonisin accumulation in maize F 1 hybrids and subsequent F 2 populations
Author(s) -
Ouko Abigael,
Okoth Sheila,
Netshifhefhe Nakisani E. l.,
Viljoen Altus,
Rose Lindy Joy
Publication year - 2020
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.1002/agj2.20145
Subject(s) - fumonisin , fusarium , biology , mycotoxin , hybrid , inoculation , contamination , agronomy , horticulture , fumonisin b1 , inbred strain , grain quality , veterinary medicine , microbiology and biotechnology , genetics , ecology , medicine , gene
Fusarium verticillioides causes Fusarium ear rot (FER) in maize ( Zea mays L.), thus reducing grain quality, yield, and contaminates grains with fumonisins. Grain infection by these fungi occurs before harvest and selection of parental lines resistant to fumonisin accumulation for breeding purposes is the most effective and environmentally friendly control strategy for F. verticillioides . This study intended to evaluate F 1 hybrids and F 2 breeding populations in Kenya for improved resistance to FER and fumonisin contamination. Trials were artificially inoculated and FER severity, F. verticillioides accumulation, and fumonisin contamination were determined. Inheritance of resistance was also determined in the F 1 hybrids. CML444 × MIRTC5, R119W × CKL05015, and CML444 × CKL05015 exhibited little to no FER and had the least fungal and fumonisin contamination, respectively. Inbred lines CML495, CKL05015, and P502 had negative, significant general combining ability (GCA) estimates for F. verticillioides colonization and fumonisin contamination, but positive, significant GCA estimates for 1,000‐kernel weight, respectively. The genotype × environment interaction was the main source of variation observed in the F 2 populations with R119W × CKL05015 and CML444 × CKL05015 being the most tolerant to fungal and fumonisin contamination in Kiboko and MIRTC5 × CML495 the most tolerant in Katumani.