Correlated resistance of cassava to mosaic and bacterial blight diseases

Hahn, S. K.; Howland, A. K.; Terry, Elein

doi:10.1007/bf00025127

Cited by 55 publications

(33 citation statements)

References 7 publications

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“…The detection of markers SSRY44 and NS136 having association with CMD resistance is a new report indicating the possibility of having another genetic loci for CMD resistance in cassava in addition to the already established on linkage group G (Fregene et al, 1997). This finding supports the polygenic control of resistance to CMD as established by Hahn et al (1980aHahn et al ( , 1980b.…”

Section: Simple Sequence Repeat (Ssr) Analysissupporting

confidence: 66%

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Mapping New Genetic Markers Associated with CMD Resistance in Cassava (Manihot esculenta Crantz) Using Simple Sequence Repeat Markers

Chokkappan¹,

Shanmugasundaram²,

Maheswaran³

et al. 2013

JAS

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Cassava mosaic disease (CMD) is the most serious disease in cassava-in India where it is grown for food, starch and sago purpose. The disease is best kept under control by exploiting the available host plant resistance, which was introgressed from M. glaziovii to cassava and it is known to be polygenic control. In the present study, an attempt was made to construct the genetic linkage map of cassava using SSR markers with the objective of mapping genes associated with CMD. Using single marker analysis (SMA), four CMD resistance markers were detected viz. SSRY28, SSRY235, SSRY44 and NS136. SSRY28 and SSRY235 were located on linkage group G and SSRY44 and NS136 on linkage group P of cassava genetic map developed by Fregene et al. (1997). Among the four markers, three (SSRY235, SSRY44 and NS136) are new markers associated with CMD resistance. The detection of markers SSRY44 and NS136 having association with CMD resistance is a new report indicating the possibility of having another genetic loci for CMD resistance in cassava in addition to the already established on linkage group G. This finding supports the polygenic control of CMD resistance.

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Section: Simple Sequence Repeat (Ssr) Analysissupporting

confidence: 66%

“…The studies conducted by Hahn, Howland, and Terry (1980a) ;Hahn, Terry, and Leuschner (1980b) to establish the genetics of resistance to CMD indicated the possibility of several genes responsible for resistance. Akano, Dixon, Mba, Barrera, and Fregene (2002) reported that the resistance could be due to a major dominant gene (CMD2).…”

Section: Introductionmentioning

confidence: 99%

Mapping New Genetic Markers Associated with CMD Resistance in Cassava (Manihot esculenta Crantz) Using Simple Sequence Repeat Markers

Chokkappan¹,

Shanmugasundaram²,

Maheswaran³

et al. 2013

JAS

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“…The clone 58308-with low cyanide potential and resistance to ACMV-was used as a source of resistance to CBB. An important research finding was that CBB resistance derived from M. glaziovii was associated with CMD resistance (Hahn et al 1980b). Furthermore, this IITA breeding endeavor led to new hybrid clones with resistance to CBB and ACMV, plus high yield and acceptable tuberous root quality traits (Hahn et al 1989).…”

Section: Cassavamentioning

confidence: 99%

Breeding Open-Pollinated, Hybrid and Transgenic Outcrossing Species

Ríos

2015

Plant Breeding in the Omics Era

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Outcrossing is the transfer of pollen grains from the anther of a flower to the stigma of another flower in a different plant of the same species in the angiosperms by the action of wind, insects, or other vectors, thereby enabling fertilization and reproduction. It allows for species diversity because it combines genetic information from different plants, and may lead to heterozygosity when involving two genetically distinct plants. About 50 % of crops show outcrossing and their reproductive systems include devices promoting it, for example, unisexuality, maturing time, self-incompatibility, and male sterility. Various outcrossing species may have a small amount (5-10 %) of selfing. Outcrossing species exhibit mild to severe inbreeding depression and significant heterosis. Maize, onion, and rye are among outcrossing species, while cotton shows up to 30 % of outcrossing. Composite, hybrid, and synthetic cultivars are the aim for breeding outcrossing species, when their seed production is feasible and profitable. A composite cultivar ensues from mixing seeds of outstanding lines (often up to 20) and encouraging open pollination among the mixed lines, while a synthetic cultivar results from crossing (6-8) lines that combine well with each other and are kept by open pollination in isolation. Pedigree, doubled haploids, and backcrossing are used for inbred line development, while recurrent selection methods accumulate favorable alleles in a breeding population. Plant genetic engineering and DNA marker-aided breeding are among the biotechnology tools for improving maize, cotton, cassava, and other outcrossing species. MaizeMaize (Zea mays) is the cereal with the largest global output and cash value. It is among the most important staple food crops, a source of feeding grains and silage for livestock, and used by the industry for ethanol, oil, and starch. Its average global per capita consumption is below that of wheat, rice, and potato because of the high

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“…Because of the low correlations between the performance at this early stage of selection and when the genotypes reach replicated trials, the early selections are based on high-heritability traits such as plant type, branching habits and, particularly, reaction to diseases (Hahn et al, 1980a(Hahn et al, , 1980bHershey, 1984;Iglesias and Hershey, 1994;Morante et al, 2005). The second stage of selection is called Clonal Evaluation Trial (CET).…”

Section: Breeding Schemementioning

confidence: 99%

“…Many examples of sources of resistance to diseases (Hahn et al, 1980a;1980b) and pests (Bellotti et al, 2002), or desirable root quality traits (Ceballos et al, 2007b; have been identified. However, the impact of these high-value characteristics is limited because their introgression requires breeding a new variety de novo.…”

Section: Possibility Of Implementing the Back-cross Schemementioning

confidence: 99%

Cassava: A Basic Energy Source in the Tropics

Cock

1982

Science

197

105

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PREFACEThis Handbook is the result of a combined effort by several current and previous cassava researchers at CIAT to review and summarize the most important results of cassava research during the past 40 years. Most of the chapters are based on the various presentations during the Regional Cassava Training Course, held in Thailand from October 6 to 17, 2008. This course was organized upon the realization that many people that were actively involved with cassava research in the 1970s and 80s, both at CIAT and in national programs, have now retired or will soon do so, and that a whole new generation of cassava researchers are currently being hired to take their place.As cassava is now becoming a very important, and mostly industrial, crop in Asia, there are many new opportunities, but also a host of new problems and challenges. These include the appearance in Asia of new cassava diseases and pests; the decreasing availability and increasing cost of rural labor, resulting in the need for partial or complete mechanization of cassava production; the rapidly increasing demand for cassava roots for production of food, feed and fuel, and the unavailability in many countries of new land for any expansion of cassava area, thus requiring a rapid increase in cassava yields to increase supplies. This requires a renewed focus on cassava research for the development of new higher-yielding varieties and more sustainable production practices.While many cassava researchers in national programs in Asia received individual or group training at CIAT-Colombia during the 1970s and 80s, this training was greatly reduced during the following two decades due to funding limitations. Thus, the objective of the Regional Cassava Training Course in 2008 was to provide a new training opportunity for young scientists in Asian countries, and to hand over the knowledge and experience of the older cassava researchers, mostly from CIAT, to a new generation that will have to face the new challenges. Thus, the course was taught mostly by current or already retired CIAT cassava researchers, while the 60-plus participants of the course included cassava researchers from Cambodia, China, East Timor, India, Indonesia, Lao PDR, Malaysia, Myanmar, the Philippines, Thailand and Vietnam. The training course not only provided knowledge -from physiology and biotechnology to animal feeding and production of fuelethanol -but also an opportunity for people from different institutions and countries to get to know each other, which will greatly facilitate future collaboration.Course participants returned home with a CD containing the PowerPoint presentations of the course. However, it was felt that a more comprehensive review of all the topics covered was warranted, as this would provide more in-depth knowledge for those working in the various specialized fields. Most of this information is available in many refereed journals, in workshop proceedings and old CIAT annual reports, but many of these are now out of print or otherwise difficult to obtain. Thus, the Cas...

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Correlated resistance of cassava to mosaic and bacterial blight diseases

Cited by 55 publications

References 7 publications

Mapping New Genetic Markers Associated with CMD Resistance in Cassava (Manihot esculenta Crantz) Using Simple Sequence Repeat Markers

Mapping New Genetic Markers Associated with CMD Resistance in Cassava (Manihot esculenta Crantz) Using Simple Sequence Repeat Markers

Breeding Open-Pollinated, Hybrid and Transgenic Outcrossing Species

Cassava: A Basic Energy Source in the Tropics

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