First report of maize lethal necrosis disease in Rwanda

Adams, IP; Harju, V.; Hodges, Tobias; Hany, U.; Skelton, A.; Rai, Shalini; Deka, M.; Smith, J.; Fox, Adrian; Uzayisenga, Bellancile; Ngaboyisonga, C.; Uwumukiza, B; Rutikanga, A.; Rutherford, M. A.; Ricthis, B; Phiri, Noah; Boonham, Neil

doi:10.5197/j.2044-0588.2014.029.022

Cited by 80 publications

(72 citation statements)

References 5 publications

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“…MCMV was first identified in Peru in 1973 (Castillo and Hebert 1974) and subsequently reported in the USA, parts of Latin America, and China (Niblett and Claflin 1978;Uyemoto 1983;Xie et al 2011). MLN has also been reported in Rwanda (Adams et al 2014) and Democratic Republic of Congo (Lukanda et al 2014). Similar symptoms on maize have been reported from Uganda and Tanzania (Wangai et al 2012).…”

Section: Introductionmentioning

confidence: 54%

Genetic analysis of tropical maize inbred lines for resistance to maize lethal necrosis disease

et al. 2017

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Maize lethal necrosis (MLN) disease is a recent outbreak in eastern Africa and has emerged as a significant threat to maize production in the region. The disease is caused by the co-infection of Maize chlorotic mottle virus and any member of potyviridae family. A total of 28 maize inbred lines with varying levels of tolerance to MLN were crossed in a halfdiallel mating design, and the resulting 340 F 1 crosses and four commercial checks were evaluated under MLN artificial inoculation at Naivasha, Kenya in 2015 and 2016 using an alpha lattice design with two replications. The objectives of the study were to (i) investigate the magnitude of general combining ability variance (r GCA 2 ) and specific combining ability variance (r SCA 2 ) and their interaction with years; (ii) evaluate the efficiencies of GCA based prediction and hybrid performance by means of a cross-validation procedure; (iii) estimate trait correlations in the hybrids; and (iv) identify the MLN tolerant single cross hybrids to be used as female parents for threeway cross hybrids. Results of the combined analysis of variance revealed that both GCA and SCA effects were significant (P \ 0.05) for all traits except for ear rot. For MLN scores at early and late stages, GCA effects were 2.5-3.5 times higher than SCA effects indicating that additive gene action is more important than non-additive gene action. The GCA based prediction efficiency for MLN resistance and grain yield accounted for 67-90% of the variations in the hybrid performance suggesting that GCA-based prediction can be proposed to predict MLN resistance and grain yield prior to field evaluation. Three parents, CKDHL120918, CML550, and CKLTI0227 with significant GCA effects for GY (0.61-1.21; P \ 0.05) were the most resistant to MLN. Hybrids ''CKLTI0227 9 CML550'', ''CKDHL120918 9 CKLTI0138'', and ''CKDHL120918 9 CKLTI0136'' ranked among the best performing hybrids with grain yield of 6.0-6.6 t/ha compared with mean yield of commercial check hybrids (0.6 t/ha). The MLN tolerant inbred lines and single cross hybrids identified in this study could be used to improve MLN tolerance in both public and private sector maize breeding programs in eastern Africa.

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Section: Introductionmentioning

confidence: 54%

Genetic analysis of tropical maize inbred lines for resistance to maize lethal necrosis disease

et al. 2017

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“…The same year, the disease was also reported to spread to neighbouring countries of Tanzania and Uganda (Makumbi and Wangai, 2013) and later it was found in Rwanda (Adams et al, 2014). The control of the disease has been reported to be difficult due to the combination of more than one virus that do not separately result into any significant symptoms DSMZ, 2014 (Adams et al, 2014;Makone et al, 2014;Liu et al, 2016). In eastern Africa, the disease has been reported to be caused by a combination of MCMV and SCMV infection (Gowda et al, 2015;Mezzalama et al, 2015;Kiruwa et al, 2016).…”

Section: Maize Lethal Necrosis Disease (Mlnd)mentioning

confidence: 93%

“…Later, the disease was identified as MLN after serological and molecular tests were carried out on infected maize plants from Bomet County and Nakuru District in 2012 (Wangai et al, 2012b). The same year, the disease was also reported to spread to neighbouring countries of Tanzania and Uganda (Makumbi and Wangai, 2013) and later it was found in Rwanda (Adams et al, 2014). The control of the disease has been reported to be difficult due to the combination of more than one virus that do not separately result into any significant symptoms DSMZ, 2014 (Adams et al, 2014;Makone et al, 2014;Liu et al, 2016).…”

Section: Maize Lethal Necrosis Disease (Mlnd)mentioning

confidence: 99%

“…The cultivation of maize has been limited by several diseases which cause serious grain loss (Anjichi, 2005;Pechanova, 2015). Recently, East Africa has been hit by another deadly disease called Maize Lethal Necrosis (MLN) which was not there before while potyviruses that form one of the causing pathogens used to exist (Wangai et al, 2012a;Wangai et al, 2012b;Adams et al, 2014;Gowda et al, 2015;Mahuku et al, 2015). The disease is caused by a combination of Maize Chlorotic Mottle Virus (MCMV) and other Potyviruses such as Sugar cane Mosaic Virus (SCMV), Maize Dwarf Mosaic Virus or Wheat Streak Mosaic Virus (Scheets, 1998;De Groote et al, 2016;Isabirye and Rwomushana, 2016).…”

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confidence: 99%

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Genetic diversity of maize accessions for maizelethal necrosis disease resistance

Ndakidemi

Sospeter

Ndunguru

et al. 2016

IJARe

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Maize is among the most preferred crop in Tanzania and other parts of the world. However, its production has been facing a number of challenges. Maize Lethal Necrosis Disease (MLND) is a new challenge in Eastern Africa. The control of MLND is said to be complicated as it is caused by a combination of more than one virus viz. Maize Chlorotic Mottle Virus (MCMV) and Sugarcane Mosaic Virus (SCMV). Stakeholders agree that the priority is to identify MLND resistant maize varieties. Genetic diversity provides the source of traits required against maize production challenges such as MLND. The study of genetic diversity in maize accessions often involves characterizing morphological plant characteristics as well as molecular marker techniques to study variation at DNA level. This review explores different literatures that address the importance of genetic diversity and the possibility of generating information towards obtaining potential materials against maize challenges and MLND in particular.

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“…In Uganda, the disease was first reported in October 2012 in Busia then in border district of Tororo, Mbale and Kapchorwa (ASARECA, 2013). MLND was first reported in February 2013 in Gisesero site, Musanze District in Northern Province of Rwanda and it then spread to western Province (Adams et al, 2014;ASARECA, 2013).This disease is not reported yet in Burundi (ASARECA, 2013).…”

Section: History and Geographical Distribution Of Mlndmentioning

confidence: 99%

Insights of maize lethal necrotic disease: A major constraint to maize production in East Africa

Kiruwa¹,

Feyissa²,

Ndakidemi³

2016

Afr. J. Microbiol. Res.

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First report of maize lethal necrosis disease in Rwanda

Cited by 80 publications

References 5 publications

Genetic analysis of tropical maize inbred lines for resistance to maize lethal necrosis disease

Genetic analysis of tropical maize inbred lines for resistance to maize lethal necrosis disease

Genetic diversity of maize accessions for maizelethal necrosis disease resistance

Insights of maize lethal necrotic disease: A major constraint to maize production in East Africa

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