Further Studies in Breeding Cassava for Virus Resistance

Jennings, D. L.

doi:10.1080/03670074.1957.11665107

Cited by 58 publications

(75 citation statements)

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“…In very susceptible varieties, severely diseased roots become completely destroyed and unfit for market or family use (Mohammed et al, 2012). CBSD root symptoms become more severe under unfavorable environmental conditions (Jennings, 1957). Higher incidence and severity of symptoms have been reported during low night temperatures (Jennings, 1957).…”

Section: Introductionmentioning

confidence: 99%

Stability of resistance to cassava brown streak disease in major agro-ecologies of Uganda

Pariyo¹,

Baguma²,

Alicai³

et al. 2015

J. Plant Breed. Crop Sci.

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Cassava brown streak disease (CBSD) is the most devastating disease of cassava in southern, eastern and cntral Africa, and can cause up to 100% yield loss. Limited progress has been made in breeding for host plant resistance due to limited knowledge on the resistance variability to the disease. Reaction of promising cassava genotypes to CBSD in multi-environments are also unknown. Therefore, this study intended to: (1) Identify additional sources of resistance to CBSD; (2) Determine the stability of resistance to CBSD, and (3) mega-environments for screening resistance to CBSD. Field evaluation of 19 genotypes was conducted in RCBD with three replications at three agro-ecologies of Uganda for two cropping cycles. Additive Main Effects and Multiplicative Interaction (AMMI) and (GGE) biplot models were used to analyze genotype-environment interactions. Based on mean field reaction, the six best genotypes identified for resistance to CBSD were: TZ/06/140, TMS30572, TZ /06/130, N3/66/1, N3/58/1 with N3/104/3 and N3/66/1 being the most stable. While N3/66/1, N3/58/1 and N3/104/3, Mzungu and Kigoma Red were reported to be putative new sources of resistance to CBSD in Uganda. Genotypes (G), Environments (E), and GxE interactions were all significant, with no genotype exhibiting complete resistance. The significant result for GxE interaction to CBSD indicates the need for multi-environment screening and is suggestive of quantitative nature of CBSD resistance.

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Section: Introductionmentioning

confidence: 99%

Stability of resistance to cassava brown streak disease in major agro-ecologies of Uganda

Pariyo¹,

Baguma²,

Alicai³

et al. 2015

J. Plant Breed. Crop Sci.

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“…Variation among cassava cultivars in expressing root and foliar symptoms of CBSD has been reported (Hillocks & Jennings, 2003;Jennings, 1957;1960). The inherent characteristics of the susceptibility or resistance of the respective variety leads to varied response to CBSV infection (Hillocks et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The reported variability in the magnitude of symptom expressions among CBSD-affected cultivars when grown in different environments (Jennings, 1957;Munthali, 1992;Nichols, 1950) triggered a need to determine the response of some of the currently farmers and researchers preferred cultivars to the disease. The need to determine rate of symptom expression on each diagnostic plant parts was paramount.…”

Section: Introductionmentioning

confidence: 99%

Response of Selected Cassava Varieties to the Incidence and Severity of Cassava Brown Streak Disease in Tanzania

Rwegasira¹,

Rey²

2012

JAS

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Cassava brown streak virus disease (CBSD) has been a serious and most damaging disease in cassava crop throughout the East, Central and Southern part of Africa. Several cassava varieties invariably respond to the disease, but the effect of the disease on affected varieties was not known. The current study was conducted to assess the ability of some farmer-preferred CBSD-affected varieties to withstand the disease. Field experiments were conducted at Kibaha Agricultural Research station from 2006 to 2008. The inherent variety characteristics influenced the incidence and severity levels of CBSD in the test plants. Leaf and stem CBSD incidences and severities, root weight and number of whiteflies (vectors) were significantly (P<0.001) related to the individual variety. Varieties Albert, Cheupe, Kibaha and Nachinyaya were seriously affected. The CBSD incidences and severities in these varieties increased with plant age, with highest disease records starting at nine to twelve months after planting. Dual infections of CBSD and CMD were recorded in four (Cheupe, Kibaha, Namikonga and Nachinyaya) of the five test varieties. Namikonga was proven to be resistant to CBSD. The correlation analysis suggested a significantly positive relationship between the perceived disease vector, Bemisia tabaci and the incidence and severities of CBSD and CMD. It was concluded that different varieties responds differently to CBSD and the disease severity increases with plant age.

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“…Cassava breeding started in 1935 at Amani in Tanzania to develop cultivars resistant to both CMD and CBSD (Jennings, 1957). Initially, a large number of cassava cultivars were evaluated; however, high enough levels of resistance or tolerance to CMD to form the basis of a breeding program were not found.…”

mentioning

confidence: 99%

“…Breeding programs were launched independently in Tanzania (Jennings, 1957) and Madagascar (Cours, 1951;Cours et al, 1997). Cassava breeding started in 1935 at Amani in Tanzania to develop cultivars resistant to both CMD and CBSD (Jennings, 1957).…”

mentioning

confidence: 99%

Identification of genes that have undergone adaptive evolution in cassava (Manihot esculenta) and that may confer resistance to cassava brown streak disease

Ferguson¹,

Koga²,

Jiang³

et al. 2015

Afr. J. Biotechnol.

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Further Studies in Breeding Cassava for Virus Resistance

Cited by 58 publications

References 1 publication

Stability of resistance to cassava brown streak disease in major agro-ecologies of Uganda

Stability of resistance to cassava brown streak disease in major agro-ecologies of Uganda

Response of Selected Cassava Varieties to the Incidence and Severity of Cassava Brown Streak Disease in Tanzania

Identification of genes that have undergone adaptive evolution in cassava (Manihot esculenta) and that may confer resistance to cassava brown streak disease

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