QTL identification for cassava bacterial blight resistance under natural infection conditions

Sedano, Johana Carolina Soto; Moreno, Róbinson Jiménez; Calle, Fernando; Carrascal, Camilo López

doi:10.15446/abc.v22n1.57951

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…Two QTLs associated with cassava bacterial blight (CBB) caused by Xanthomonas axonopodis pv. manihotis ( Xam ) were reported on linkage group (LG) 4 and LG8 that explained 12.6 and 10.9% of the field resistance to CBB, respectively ( Sedano J. S. et al, 2017 ). Another study conducted by Sedano J. C. S. et al (2017) found five strain-specific QTLs conferring resistance to Xam that explained 15.8 and 22.1% of the phenotypic variance.…”

Section: Connecting Genotypic and Phenotypic Information And Discovermentioning

confidence: 99%

Technological Innovations for Improving Cassava Production in Sub-Saharan Africa

et al. 2021

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Cassava is crucial for food security of millions of people in sub-Saharan Africa. The crop has great potential to contribute to African development and is increasing its income-earning potential for small-scale farmers and related value chains on the continent. Therefore, it is critical to increase cassava production, as well as its quality attributes. Technological innovations offer great potential to drive this envisioned change. This paper highlights genomic tools and resources available in cassava. The paper also provides a glimpse of how these resources have been used to screen and understand the pattern of cassava genetic diversity on the continent. Here, we reviewed the approaches currently used for phenotyping cassava traits, highlighting the methodologies used to link genotypic and phenotypic information, dissect the genetics architecture of key cassava traits, and identify quantitative trait loci/markers significantly associated with those traits. Additionally, we examined how knowledge acquired is utilized to contribute to crop improvement. We explored major approaches applied in the field of molecular breeding for cassava, their promises, and limitations. We also examined the role of national agricultural research systems as key partners for sustainable cassava production.

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Section: Connecting Genotypic and Phenotypic Information And Discovermentioning

confidence: 99%

Technological Innovations for Improving Cassava Production in Sub-Saharan Africa

et al. 2021

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“…The resistance levels acquired have been associated with general plant defence mechanisms that limit colonisation of the xylem, such as lignification, callose deposition, suberization, accumulation of phenolic compounds, and vessel occlusion (Kpemoua et al, 1996;Jorge et al, 2000). In recent years, several QTLs have been found to be connected to Xam resistance in cassava, with specific genes linked to CBB resistance (Soto et al, 2017;Fanou et al, 2018;Díaz et al, 2018). These discoveries open potential new possibilities by incorporating these QTLs and genes into varieties with desired genetic backgrounds.…”

Section: Xanthomonas Phaseoli Pv Manihotismentioning

confidence: 99%

Current status of plant pathogens of agricultural importance for Colombia. A review

Amaro

Cope

Franco-Orozco

2021

Rev. Colomb. Cienc. Hortic.

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Plant disease still plays a major role in limiting agricultural production worldwide. Pathogens and pests reduce crop yield and can cause large reductions in crop quality. Colombia is no exception as it contends with many devastating pathogens that present a major threat to the country’s agricultural sector. This review is important because it highlights four of the more damaging pathogens that affect the economics of important crops in Colombia - Xanthomonas phaseoli pv. manihotis (Xpm), Fusarium oxysporum f. sp. cubense (Foc), Phytophthora palmivora, and Hemileia vastatrix. This paper was based on an extensive literature search for plant diseases in Colombia in databases such as PubMed and Google Scholar. Moreover, this search was complemented with research on crop production in the country in databases made available by the Food and Agriculture Organization of the United Nations (FAO). The four pathogens reviewed in this paper were chosen not only because of their current devastating effects on Colombia’s agricultural production but also because of their potential to cause further damage in the near future. Understanding the current situation of these crop pathogens in Colombia is imperative for state directives aimed at developing informed and efficient control strategies.

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“…Among these QTL, two were located on linkage groups N and O, where we also found markers linked to resistance in the present study. More recently, two new QTL explaining 62% and 21% of the CBB resistance were identified to the Xam strains ClO151 and ClO121 [109], and two novel QTL which explain 10.9 and 12.6% of the field resistance to the disease, with four genes identified in the QTL intervals [110]. The genes code for a protein related to the vacuolar-sorting receptor, a serine protease carboxypeptidase, a C 2 HC zinc finger-containing protein and for a core-2/i-branching beta-1,6-nacetylglucosaminyltransferase protein.…”

Section: Resistance Mechanismsmentioning

confidence: 99%

Cassava Bacterial Blight: A Devastating Disease of Cassava

Fanou¹,

Zinsou²,

KerstinWydra³

2018

Cassava

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Cassava (Manihot esculenta Crantz) with its long life cycle is affected by several diseases of which cassava bacterial blight (CBB) is the major bacterial disease in the cassava belt worldwide. The epidemiological and ecological investigations undertaken on the disease showed that the causal agent, the bacterium Xanthomonas axonopodis pv. manihotis (Xam), possesses several means for survival and dissemination that may play an important role as inoculum sources for the infection when favorable conditions occur, and the subsequent damage of the plant causing severe yield losses. In fact, Xam survives epiphytically on some weeds occurring in and around cassava fields without developing blight symptoms. Investigating the survival period over the seasons, a longer survival exceeding 5 months has been observed in non-decayed cassava debris. Also, some insects in cassava field like the variegated grasshopper (Zonocerus variegatus) vehicles the pathogen for some time. Over seasons Xam also survives often latently, in cassava stems which are then used for establishing new plantations. In regional disease surveys across ecozones in West Africa, no zone of preference has been found. Though, comparing the development of the disease and the damages caused in yield loss trials in two agro-eco-zones over 2 years, CBB was more pronounced and caused higher yield and biomass losses in the forest savannah transition zone than in the dry savannah where symptom development was positively correlated with the rainfall patterns. The detailed knowledge of the epidemiology, disease development, survival and dissemination, of the reaction of cassava varieties towards CBB such as physiological resistance mechanisms, identification of genetic resistance (QTL) and the background of observed field resistance as well as of the influence of planting time and cropping pattern allows to recommend integrated management measures such as sanitation, intercropping, removal of diseased leaves, management of planting dates according to ecozone, soil amendments, use of resistant genotypes.

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QTL identification for cassava bacterial blight resistance under natural infection conditions

Cited by 5 publications

References 33 publications

Technological Innovations for Improving Cassava Production in Sub-Saharan Africa

Technological Innovations for Improving Cassava Production in Sub-Saharan Africa

Current status of plant pathogens of agricultural importance for Colombia. A review

Cassava Bacterial Blight: A Devastating Disease of Cassava

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