Research Article Periclinal chimera can transfer resistance to nematodes in cassava

Abstract

Screening cassava germplasm for resistance to the rootknot nematode (Meloidogyne javanica) showed that periclinal chimera, which came from combination of the wild species Manihot fortalezensis and indigenous cultivar UnB 201, resulted in resistance to M. javanica. Apparently periclinal chimera acquired resistance from M. fortalezensis, with its tissue forming a subepidermis and the internal tissue. Apparently, resistance was due to interaction of DNA in the chimera components, since the DNA moves within all plant tissues. This interaction provided the increased vigor observed in periclinal chimera. This is the first report of transferring resistance to a pathogen by periclinal chimera.

Periclinal Chimera: A New Efficient Plant Breeding Technique

“…These characteristics come from either of the two parents and are imposed on to the other genotype. Examples from this author and coworkers demonstrate that synthetic chimera could be an important source of new phenotype and can transfer genotype from either two parents [10]. The most important advantage of this new breeding method is the short time of synthesis of periclinal chimera during very few months compared to several years necessary for producing a new variety in conventional methods.…”

“…In the past, periclinal chimera had contributed a lot in diversification of fruit chimera that arose in nature [18]. The most important of these is that periclinal chimera can transfer resistance to disease from any of its two parents producing a resistant type within a very short time not pass very few months [10]. In traditional methods of plant breeding it needs hybridization between resistant types and susceptible one followed by backcrosses that normally consume several years.…”

“…Recent research of Nassar and coworkers [6] [7] [8] [9] exposed and showed clearly the use for interspecific chimera for developing a new useful cultivar. One of the most striking features is what proved by Nassar and coworkers [10] that periclinal chimera can be used to transfer resistance to diseases and consequently this is applied to other characters. This can be done within a very short time compared to several generations of back crosses needed in classical breeding methods which consume various years of hybridization.…”

Research Article Cassava Periclinal Chimera Vigor: A theory on its origin

“…Periclinal chimera of two genotypes can be considered a new variety with its new characteristics. Examples came from this author and co workers demonstrated that synthetic chimera could be an important source of new phenotype and can transfer genotype from either two parents (Ferreira et al, 2021). The most important advantage of this new breeding method is the short time of synthesis of periclinal chimera during very few months compared to several years necessary for producing a new variety in conventional methods.…”

“…Recent research of Nassar and coworkers (Nassar and Bomfim, 2013, 2014Bomfim and Nassar, 2014) exposed and showed clearly the use for interspecific chimera to develop a new useful cultivar. One of the most striking features is what proved by Nassar and coworkers (Ferreira et al, 2021) that periclinal chimera can be used to transfer resistance to diseases and consequently this can be applied to other characters.…”