Annor Benjamin, Badu-Apraku Baffour, Nyadanu Daniel, Akromah Richard, Fakorede Morakinyo A B
CSIR-Crops Research Institute Kumasi Ghana.
Department of Crop and Soil Sciences Faculty of Agriculture Kwame Nkrumah University of Science and Technology Kumasi Ghana.
Plant Breed. 2020 Aug;139(4):708-716. doi: 10.1111/pbr.12822. Epub 2020 Apr 20.
Identification of heterotic groups and efficient testers, which are important prerequisites for the development of outstanding hybrids, has been a major challenge to its success, especially for early and extra-early germplasm. This study was carried out to (a) identify the most efficient heterotic grouping method for classifying a set of inbred lines and (b) determine the efficiency of testers in classifying inbred lines into heterotic groups. A total of 205 hybrids obtained by crossing 41 inbred lines with five standard testers were evaluated together with five hybrid checks under drought, low soil nitrogen (N), -infested and optimal environments in Nigeria between 2014 and 2016. The heterotic group's specific and general combining ability (HSGCA) method was more effective in classifying the inbred lines into heterotic groups. Testers TZEI 17 and TZEI 23 were the most efficient across environments and could be invaluable for classifying other lines into heterotic groups and assessing combining ability of maize inbreds. In addition, these testers and heterotic groups represent an invaluable resource for development of outstanding hybrids in sub-Saharan Africa (SSA).
确定杂种优势群和高效测验种是培育优良杂交种的重要前提，这对其成功构成了重大挑战，尤其是对于早熟和特早熟种质而言。本研究旨在：（a）确定用于对一组自交系进行分类的最有效的杂种优势分组方法；（b）确定测验种在将自交系分类到杂种优势群中的效率。2014年至2016年期间，在尼日利亚的干旱、低土壤氮（N）、虫害和最佳环境条件下，对通过将41个自交系与5个标准测验种杂交获得的205个杂交种以及5个杂交对照种进行了评估。杂种优势群特异性和一般配合力（HSGCA）方法在将自交系分类到杂种优势群中更为有效。测验种TZEI 17和TZEI 23在所有环境中效率最高，对于将其他自交系分类到杂种优势群以及评估玉米自交系的配合力具有重要价值。此外，这些测验种和杂种优势群是撒哈拉以南非洲（SSA）培育优良杂交种的宝贵资源。
