Introgression of whitefly (Aleurotrachelus socialis) resistance gene from F1 inter-specific hybrids into commercial cassava

Akinbo, Olalekan; Labuschagne, Maryke; Fregene, Martin A.

doi:10.1007/s10681-011-0436-8

Cited by 17 publications

(8 citation statements)

References 22 publications

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“…In Table 1, genotype NR11/0124 scored lowest in the mean CAD recorded while genotypes NR11/0123, NR11/128 and TMS 30570 recorded the highest (3). However, severities of CGM across the genotypes were relatively low [18,19]. It is a fundamental knowledge in crop science that crop growth has positive and significant relationship with yield [20,21] however; trend in disease severity and tuber yield differed.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of High Beta Carotene Cassava Genotypes at Advanced Trial in Nigeria

Edoh¹,

Adiele²,

Ndukwe³

et al. 2016

Open Conf. Proce. J.

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Thirteen cassava genotypes were evaluated from advanced field trial for total carotene content (TCC), % dry matter content (DMC), fresh root yield (FRY) and biotic stresses alongside two widely cultivated cassava varieties (UMUCASS 36 and TMS 30572) as checks in 2013/2014 cropping season at research station of National Root Crops Research Institute (NRCRI) Umudike in Nigeria. The objective of the experiment was to select promising clones for possible release to Nigeria farmers. The results of the TCC analysis ranged from 1.68-10.16 µg/g. Genotypes NR11/0063, NR11/0123 and NR11/0140 had TCC ranged from 10.47-8.72 (µg/g) which are above the national checks (UMUCASS 36 and TMS 30572) of 8.34 and 1.68(µg/g) respectively. The DMC of the genotypes ranged from 33.0-15.0 %. TMS 30572 gave the highest DMC (33.0%) while genotype NR11/0064 had the least (15.0%) DMC. Severity of cassava mosaic disease (CMD), cassava bacterial blight (CBB), cassava green mite (CGM) and cassava anthracnose disease (CAD) evaluated for 12 months varied among the genotypes. Symptom expressions of CMD, CBB and CAD were relatively higher (3.0) for genotype NR11/0123 and this resulted to low fresh root yield (FRY) of 18 t/ha whereas TMS 30572 with moderate severity (1.8) had a higher FRY of 32.6 t/ha. The severity of CGM was moderate across the genotypes with no significant difference (P<0.05) observed. Further analysis showed that CMD, CBB and CAD were significantly correlated (r=0.618, 0.699 and 0.621, p<0.05) with harvest index (HI) among the genotypes evaluated. Three genotypes were selected for further evaluation and possible release to Nigeria farmers.

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Section: Resultsmentioning

confidence: 99%

Evaluation of High Beta Carotene Cassava Genotypes at Advanced Trial in Nigeria

Edoh¹,

Adiele²,

Ndukwe³

et al. 2016

Open Conf. Proce. J.

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“…Cassava is a major source of carbohydrates for millions of people in several regions, particularly in developing countries. The cassava crop plays a vital role in reducing poverty and rural exodus because the use of technology required is minimal [2]. In addition to the social impact, cassava has attracted the interest of the agriculture business due to its multiple industrial uses of starch [3].…”

Section: Introductionmentioning

confidence: 99%

Bioassay of Lemongrass on Fungi Pathogen Associated with Cassava Tubers Rot in Farin Gada Market, Jos

John

Oke

Ishaya

et al. 2019

MRJI

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The aim of this study was to determine the effects of Lemongrass on fungal pathogen associated with cassava tuber rot. The study was carried out in the biology laboratory of the Federal College of Forestry Jos, Plateau state from March to May, 2019. Rotten and healthy cassava tubers were collected separately from Farin-Gada market Jos, fungi species were isolated from rotten cassava tubers by direct inoculation of the spoiled part on sterile Potato Dextrose Agar medium and incubated for 3-5 days, the isolated fungi were identified microscopically and macroscopically. The identified fungi were used for pathogenicity test. The antifungal effect of different concentrations of ethanol extract of lemongrass was investigated. Data collected were analyzed using one way ANOVA and the means were separated using Least Significant Difference (LSD) at (p≥0.05). The fungi isolated include, Fusarium sp, Penicillium sp, Geotrichum candidum, and Aspergillus flavus. The frequency of occurrence of the isolated fungi indicated Fusarium sp, Penicillium sp, Geotrichum candidum, and Aspergillus flavus had 30, 15, 35 and 20% respectively. 20 mL of the tested extract gave the highest inhibition of 19.07, 20.57, 18.17 mL and 18.00 mL on Fusarium spp, Penicillium spp, Geotrichum candidum and Aspergillus flavus respectively. At the 5th day of incubation the results of the pathogenicity showed that Aspergillus flavus gives the highest deterioration of 9.17 mm. The length of deterioration showed significant difference. The lemongrass extract indicated anti-fungal effect on the fungal isolates, therefore could be used to control cassava tuber rot caused by fungi.

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“…Alves et al (2011) assessed 14 accessions of six wild Manihot species with regard to biological aspects of M. tanajoa and found that the life cycle (larva-adult period) ranged from 5.76 to 8.18 days. The accessions of wild M. anomala species formed the group showing the longest mite development period, whereas M. peruviana and M. flabellifolia accessions showed shorter larva-adult periods.…”

Section: Resultsmentioning

confidence: 99%

“…are adapted to semiarid conditions and are potential sources of genes for drought tolerance; 4) the roots of interspecific hybrids of M. esculenta ssp. flabellifolia contain a high protein content (AKINBO et al, 2012a); 5) M. flabellifolia accessions and interspecific crosses of M. esculenta ssp. flabellifolia exhibit different levels of resistance to the whitefly Aleurotrachelus socialis Bondar (CARABALI et al 2010); and 6) resistance to A. socialis can be introgressed in interspecific hybrids of commercial cassava (AKINBO et al, 2012b).…”

Section: Introductionmentioning

confidence: 99%

Genetic dissimilarity for resistance to Mononychellus tanajoa (bondar) (Acari, Tetranychidae) among domesticated and wild Manihot species

2015

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ABSTRACT. The aim of this study was to evaluate the genetic dissimilarity among wild and domesticated species of Manihot for resistance to cassava green mite during the insect life cycle. Nine accessions of wild Manihot species, M. esculenta ssp. flabellifolia, M. esculenta ssp. peruviana, and M. carthaginensis ssp. glaziovii, and two clones of M. esculenta (Cigana Preta and Sacaí) were evaluated under laboratory conditions at 25 ± 1°C, 70 ± 10% RH, and a 12-h photophase. Daily observations during the mite life cycle stages (larva-adult) were recorded. The data were subjected to an analysis of variance, a Scott-Knott test (5%), and Singh criterion, cluster, and principal component analyses. The larval-adult period ranged from 5.53 to 7.01 days: the longest period was observed on an M. glaziovii accession (GLA-19-DF) and the shortest on an M. flabellifolia accession (FLA-025V). The UPGMA method allowed the division of the genotypes into six groups, with the greatest distance between the FLA-025V and GLA-19-DF accessions. The first two main components explained 77.50% of the total accumulated variation. The association of the longest cycle duration of M. tanajoa with the lowest larval-adult viability suggests that GLA-19-DF is less favorable to mite development compared to the other accessions. Significant variability among the genotypes was observed.Keywords: biology, cassava, biotic stress, green mite.Dissimilaridade genética entre espécies domesticadas e silvestres de Manihot quanto à resistência ao Mononychellus tanajoa (bondar) (Acari, Tetranychidae) RESUMO. O objetivo deste trabalho foi avaliar dissimilaridade genética entre espécies domesticadas e silvestres de Manihot, a partir da duração do ciclo biológico, quanto à resistência ao Mononychellus tanajoa. Foram avaliados nove acessos das espécies silvestres de Manihot: M. esculenta ssp. flabellifolia, M. esculenta ssp. peruviana e M. carthaginensis ssp. glaziovii, dois clones de M. esculenta: Cigana Preta e Sacaí. O estudo foi conduzido em laboratório, a 25±1 o C, 70±10% de UR e 12 h de fotofase. Foram realizadas observações diárias sobre a duração das fases do ciclo biológico (larva-adulto). Os dados submetidos à análise de variância, teste Scott-Knott (5%), critério de Singh, análise multivariada de agrupamento e de componentes principais. O período larva-adulto variou de 5,53 a 7,01 dias. O maior período foi verificado no acesso de M. glaziovii , e o menor no acesso de M. flabellifolia (FLA-025V). O método de UPGMA, propiciou a divisão dos genótipos em seis grupos. A maior distância foi entre o acesso FLA-025V e GLA-19-DF. As duas primeiras componentes principais explicaram 77,50% da variação total acumulada. A maior duração do ciclo de M. tanajoa associado a menor viabilidade larvaadulto sugere que o acesso GLA-19-DF é menos favorável ao desenvolvimento do ácaro em relação aos demais e verificou-se variabilidade genética entre os genótipos avaliados.Palavras chave: biologia, mandioca, estresse biótico, ácaro verde.

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Introgression of whitefly (Aleurotrachelus socialis) resistance gene from F1 inter-specific hybrids into commercial cassava

Cited by 17 publications

References 22 publications

Evaluation of High Beta Carotene Cassava Genotypes at Advanced Trial in Nigeria

Evaluation of High Beta Carotene Cassava Genotypes at Advanced Trial in Nigeria

Bioassay of Lemongrass on Fungi Pathogen Associated with Cassava Tubers Rot in Farin Gada Market, Jos

<b>Genetic dissimilarity for resistance to <i>Mononychellus tanajoa</i> (bondar) (Acari, Tetranychidae) among domesticated and wild <i>Manihot</i> species

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