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Stability analysis of yield and aflatoxin accumulation resistance in maize using GGE biplot
Oppong Allen,Dadzie Abu Mustapha,Ifie Beatrice Elohor,Asante Maxwell D.,Prempeh Ruth N. A.,Abrokwah Linda A.,Kubi Zipporah Appiah,Marfo Esther A. 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.2
Maize (Zea mays L.) is the most important cereal crop in sub-Saharan Africa. However, its production is constrained by many factors including low yields and afatoxin contamination. Host resistance to afatoxin accumulation and productive hybrid varieties are seen as key approaches in addressing these challenges. Sixteen afatoxin-resistant inbreds obtained from Corn Host Plant Resistance Research Unit (CHPRRU), USDA ARS in Mississippi, USA, CIMMYT, IITA, etc., were crossed as males to six locally adapted inbreds in a North Carolina II design to generate 160 new hybrids and planted together with 9 checks using 13×13 lattice with three replications. The new hybrids were evaluated across six environments. Thirty-one of the most promising hybrids were subjected to the GGE biplot analysis to determine their stability for yield and afatoxin accumulation resistance. Genotype, G10 (ENTRY-5×Tzi8, G20 (TZEE-15×CML343, G28 (TZEEI-6×CML247 and G26 (TZEEI-6×CML11 were highly stable hybrids for yield while G08 (ENTRY-5×Ki3, G11 (ENTRY-85×CML247 and G19 (TZEEI-15×MP715 were relatively stable for afatoxin accumulation resistance. This means that it is possible to produce high-yielding afatoxin-resistant hybrids for consumers in the trial agro-ecologies.
Diatta Cyril,Tovignan Thierry Klanvi,Akata Eyanawa Atchozou,Ifie Beatrice Elohor,Sarr Mame P.,Bassene César,Aidara Ousmane,Ndione Pierre Alfred,Gackou Malick,Manga Anicet Georges Bruno,Danquah Eric Yi 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.2
Increasing sorghum production per unit area in the farmer’s feld by developing high yielding tannin-free and grain mold tolerant varieties in Senegal is the goal of the present study. Line×tester mating design was used to cross eleven tannin-free non-photoperiodic male fertile sorghum varieties with two male-sterile A-lines to produce 22 F1 hybrids. These hybrids along with the thirteen parents and one grain mold resistant hybrid check were evaluated under natural grain mold infestation in two contrasted sites using a 6×6 lattice design with three replications. Results on combining ability suggested that additive gene actions were important in the control of grain mold resistance while non-additive gene actions were preponderant in the inheritance of grain yield. The parental lines F2-20, Macia, Faourou, and Dorado were the best general combiner for grain mold resistance. Of these, Dorado was identifed as the best combiner for yield and yield components. Additionally, the hybrid CE310-31A×Sureño was identifed as the best hybrids combination for yield, yield components and grain mold resistance. Furthermore, the hybrid crosses CE310-31A×F2-20, CE310-31A×Sureño and AVG-1×Dorado showed the best mid-parent heterosis for grain yield and resistance to grain mold. Moreover, based on their combining ability and heterosis, seven hybrids were identifed for their resistance to grain mold and high yielding. These hybrids could be tested in multilocation trials for a subsequent release.