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resistance to the whitefly Aleurotrachelus socialis(Hemiptera:Aleyrodidae) and SSR Marker Identification in Advanced Populations of the Hybrid Manihot esculenta *** flabellifolia

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Journal of Integrative Agriculture 2013年第12期12卷 2217-2228页

作者： Arturo Carabalí James Montoya-Lerma Anthony C Belloti Martin Fregene Gerardo Gallego Deparment of Biology Universidad del Valle International Center of Tropical Agriculture (CIAT)

Genes resistant to Aleurotrachelus socialis were transferred to the F 1 from the interspecific hybrid wild species of Manihot flabellifolia to *** and two advanced generations of backcrosses（BC 1 and BC 2）.We characterized the resistance of *** transferred to BC 2 parents（CW67-160,CW67-130,CW67-44）,MTAI-8（BC 1）,resistant（CMB9B-73） and susceptible（CMB9B-104） genotypes from contrasting pools,and resistant（MEcu-72） and susceptible（CMC-40） *** demography and biology were *** molecular markers associated with a phenotypic response of plant resistance were detected in segregating populations（BC 2）.Results showed that although female survival time was similar on all hosts,the lowest averages of longevity,fecundity and oviposition rate were observed in the resistant control MEcu- 72,only being significantly similar to the parent *** the BC 1 and BC 2 populations were compared,it was found that *** fecundity was eight times lower on CMB9B-73 progeny than on CW67-130,expressing the highest levels of resistance to the *** genotypes of CMB9A and CMB9B family had the best segregation.A total of 486 microsatellite primers were evaluated using bulked segregant analysis（BSA）,11 showed polymorphism between the contrasting pools and only one showed significant differences between resistant and susceptible *** conclusion,fecundity was the parameter that impacted most on the intrinsic rate of *** population growth.

关键词： cassava wild parents interspecific hybrids whitefly resistance BSA

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African Cassava whitefly,Bemisia tabaci,resistance in African and South American Cassava Genotypes

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Journal of Integrative Agriculture 2012年第2期11卷 327-336页

作者： Christopher A Omongo Robert Kawuki Antony C Bellotti Titus Alicai Yona Baguma M N Maruthi Anton Bua John Colvin National Crops Resources Research Institute NamulongeP.O.Box 7084KampalaUganda International Centre for Tropical Agriculture(CIAT) A.A.6713CaliColombia Natural Resources Institute University of GreenwichCentral AvenueChatham MaritimeChathamKent ME4 4TBUK

The whitefly,Bemisia tabaci,is a major pest of cassava,particularly in Africa where it is responsible both for the transmission of plant viruses and,increasingly,for direct damage due to feeding by high *** date,there have been no practical solutions to combat this emerging problem,due to the inability of the subsistence farmers that grow cassava to afford expensive inputs such as insecticides.A programme of research was carried out linking institutes in Africa,the UK and South America,to identify possible resistance sources in cassava to the whitefly,Bemisia *** South American genotype MEcu 72 and several Ugandan cassava landraces including Ofumba Chai,Nabwire 1 and Mercury showed good levels of resistance to *** and screen-house experiments showed that all of the improved,high-yielding cassava mosaic disease（CMD）resistant cassava genotypes assessed were highly susceptible to *** and supported high populations of all life *** data support the hypothesis that the continuing high populations of cassava *** in Uganda are due,in part,to the widespread adoption of CMD-resistant cassava varieties during the CMD *** also show that the whitefly,Aleurotrachelus socialis,resistance present in the South American cassava genotypes could have broader applicability in the Old World.

关键词： whitefly resistance cassava direct pest Africa South America

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