Identification of Elite, High Yielding and Stable Maize Cultivars for Rwandan Mid-altitude Environments

Ngaboyisonga, C.; Nizeyimana, F.; Nyombayire, Alphonse; Gafishi, M. K.; Ininda, Jane; Gahakwa, Daphrose

doi:10.1007/978-3-319-07662-1_14

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…Major constraints are present that lead to a decrease in production of maize e.g. : drought, diseases and less availability of improved varieties in the whole country (Mulinga, 2014), new policies like the crop intensification program(CIP) will contribute to the release of new varieties and will also make these varieties available to the farmers (Ngaboyisonga et al, 2016) However, at present, some of the available released varieties are limited to cultivation within certain environments (Ngaboyisonga et al, 2014)…”

Section: Introductionmentioning

confidence: 99%

Genotype by environment interaction and yield stability of hybrid maize varieties evaluated in three locations of mid altitudes of Rwanda

Rwasimitana¹,

Claver²,

Celestin³

et al. 2021

Preprint

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A multi-environment yield trial is important to understand the genotype by environment interaction and to select high performing and stable crop varieties. The aim of this study was to identify high yielding and stable hybrid maize varieties for mid altitudes of Rwanda, to compare the performance of new hybrid varieties with commercial checks, and to determine the extent of genotype by environment interaction. Maize is a staple crop used to fight hunger and malnutrition in developing countries. Different varieties have been released to increase yield including Open Pollinated Varieties (OPVs) and hybrids. Genotype by Environment interaction is an issue that all breeding program need to overcome. In the future, improved varieties will be needed in order to increase income for farmers and help in food security Field experiments were conducted to assess the performance and the stability of 27 maize varieties in the mid altitudes zone of Rwanda in the Cyabayaga, Rubona and Bugarama sites. The experimental design was alpha lattice (0,1) with a Randomized Complete Block Design (RCBD). Data were collected for a number of characters i.e. silking, Antesis-Silking Interval (ASI), plant height, plant aspect, ear per plant, husk cover, ear aspect, ear rot and grain yield. Data were analyzed by GenS Stat statistical computer package, Discovery Edition. ANOVA and AMMI analysis were applied to assess the performance and the stability of varieties and the degree of genotype by environment interaction (G×E). In addition, Principal Component Analysis (PCA) and cluster analysis were conducted to assess relationships between varieties. The results showed that RHM1706, RHMM1701, RHM1409, RHMM1707, WH509, RHMM1704, RHM407, WH101, RHMM1710, RHMM1708, PAN53 and RHM104 were stable across locations. Furthermore, the evaluated varieties were found to cluster into five groups. Varieties found to be most stable are recommended for further use.

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Section: Introductionmentioning

confidence: 99%

Genotype by environment interaction and yield stability of hybrid maize varieties evaluated in three locations of mid altitudes of Rwanda

Rwasimitana¹,

Claver²,

Celestin³

et al. 2021

Preprint

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“…Broad adaptation implies that varieties tend to be adapted in several and diverse environments whereas narrow adaptation is when varieties tend to be adapted in specific environments (Gauch 2013). Likewise, there are several studies where it was found that mega-environment effects were more important than the effects of individual environments and broad adaptation is higher than narrow adaptation (Mukherjee et al 2013;Ngaboyisonga et al 2014). Also, studies where environment variation was the most important than the two other components were frequently reported (Beyene et al 2011).…”

Section: Evaluation Of 12 Elite Hybrid Maize Varieties In Multi-envir...mentioning

confidence: 99%

Genotype by environment interaction (GEI) of maize varieties resistant to maize lethal necrosis for mid altitudes of Rwanda

Ngaboyisonga

Suresh

Nizeyimana

et al. 2022

Trop Agric Res & Ext

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Maize is a leading crop in Rwandan agriculture, but its production is threatened by the outbreaks of Maize Lethal Necrosis (MLN) virus disease. The establishment of MLN artificial inoculation facility in the region where Rwanda is located has facilitated the developing MLN resistant maize genotypes. The objective of this study was to identify maize MLN resistant varieties that are high yielding and stable across environments, and to integrate them with other disease management strategies in Rwanda. Forty-one maize varieties were screened through MLN artificial inoculation facility in Naivasha, Kenya. Then, 24 of them were evaluated under natural inoculation in Karama research station, Rwanda. Twelve potential maize varieties were investigated for genotype by environment interaction in four sites at mid-altitudes in Rwanda, including Cyabayaga Karama and Bugarama, over two consecutive seasons. The study identified three maize MLN moderately resistant varieties; RHM1402, RHM1407, and RHM1409 that are high yielding and stable across environments. MLN was found to increase the incidence of ear rot, hence, raising the risks of infection with harmful mycotoxins such as aflatoxins. In order to manage the MLN disease in Rwanda, it has been advocated that the identified varieties be made available to farmers and integrated with other methods of control.

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“…Variety ISARM101 was developed using CIMMYT germplasm and local ecotypes as described by Ngaboyisonga et al (2014). Firstly, ten parental inbred lines were chosen and crossed in GDM4 methodology to produce 45 Single Cross Hybrids (SCHs).…”

Section: Seventeen Maize Inbred Linesmentioning

confidence: 99%

Combining ability for grain yield and silking of maize inbred lines derived from three open pollinated varieties released for mid altitudes of Rwanda: Comparison of Diallel and North Carolina Design II

Ngaboyisonga¹,

Nizeyimana²,

Gafishi³

et al. 2019

Afr. Crop Sci. J.

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Identification of Elite, High Yielding and Stable Maize Cultivars for Rwandan Mid-altitude Environments

Cited by 5 publications

References 8 publications

Genotype by environment interaction and yield stability of hybrid maize varieties evaluated in three locations of mid altitudes of Rwanda

Genotype by environment interaction and yield stability of hybrid maize varieties evaluated in three locations of mid altitudes of Rwanda

Genotype by environment interaction (GEI) of maize varieties resistant to maize lethal necrosis for mid altitudes of Rwanda

Combining ability for grain yield and silking of maize inbred lines derived from three open pollinated varieties released for mid altitudes of Rwanda: Comparison of Diallel and North Carolina Design II

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