Genetic analysis of bud necrosis disease caused by groundnut bud necrosis virus (GBNV) in tomato (Solanum lycopersicum L.)

Kumar, Amarjeet; Sadashiva, A. T.; Basavaraj, Y. B.; Venugopalan, R.; Rao, Eguru Sreenivasa; Nandeesha, P.

doi:10.1007/s10681-020-02657-z

“…Recent published generation mean analyses based on field data, involving diverse crops and traits, six to seven generations, one to six crosses, one or more seasons or environments, evidenced epistasis in many cases but not all epistatic components were statistically different from zero (Shirinpour et al 2020;Rai et al 2020;Pal et al 2020;Singh 2019, 2018;Mohammed et al 2018). This is not a problem since the non-additive components are a sum of effects that take sign.…”

Section: Discussionmentioning

confidence: 99%

“…Similar to the heterosis and combining ability analysis, this biometrical genetics methodology is based on the estimation of linear components of means of populations derived from homozygous parents. This approach has been commonly used by breeders of self-and cross-pollinated crops since its proposition (Rai et al 2020;Addy et al 2020;Verma and Singh 2018). Its main advantages are: it is easily performed for crops with inbred/pure/DH lines; it is applicable to any trait but few studies involved grain yield (Mohammed et al 2018); it allows for testing dominance and epistasis separately; and the computation and the interpretation are simple.…”

Section: Introductionmentioning

confidence: 99%

The impact of linkage disequilibrium and epistasis in the studies of inheritance based on Hayman’s diallel and generation mean analysis

Viana

¹

2021

Preprint

0

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This simulation-based study assessed the impact of linkage disequilibrium (LD) and epistasis on Hayman’s diallel and generation mean analysis, assuming hundreds of genes, variable degree of dominance, and seven types of digenic epistasis. The diallel parents were 15 doubled-haploid lines from a high LD population. The generation mean analysis was based on seven generations, assuming association. Under low LD and no epistasis, the diallel analysis provided confident results about the inheritance of the quantitative trait and high correlation between number of recessive genes and Wr + Vr, but biased estimates of the dominance components and genetic parameters. The additional consequences of high LD under no epistasis were rejection of the additive-dominance model assuming high heritability and lower correlation. Assuming 100% of epistatic genes, for four epistasis types there was evidence of inadequacy of the additive-dominance model. Assuming 30% of epistatic genes, there was a tendency for accepting the additive-dominance model for low heritability traits and for rejecting for high heritability traits. Linkage and epistasis affects the estimates of the genetic components of the generation means. Even assuming 100% of interacting genes, for most epistasis types there was no statistical evidence of epistasis. Assuming positive partial dominance, the signs of the epistatic components do not allow discriminate complementary, recessive, dominant and recessive, duplicate genes with cumulative effects, and non-epistatic genic interaction. Negative epistatic components evidence dominant epistasis. When the additive x additive and dominance x dominance components are positive and the additive x dominance component is negative, there is duplicate epistasis.

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“…Recent published generation mean analyses based on field data, involving diverse crops and traits, six to seven generations, one to six crosses, one or more seasons or environments, evidenced epistasis in many cases but not all epistatic components were statistically different from zero (Shirinpour et al 2020;Rai et al 2020;Pal et al 2020;Singh 2019, 2018;Mohammed et al 2018). This is not a problem since the non-additive components are a sum of effects that take sign.…”

Section: Discussionmentioning

confidence: 99%

“…Similar to the heterosis and combining ability analysis, this biometrical genetics methodology is based on the estimation of linear components of means of populations derived from homozygous parents. This approach has been commonly used by breeders of self-and cross-pollinated crops since its proposition (Rai et al 2020;Addy et al 2020;Verma and Singh 2018). Its main advantages are: it is easily performed for crops with inbred/pure/DH lines; it is applicable to any trait but few studies involved grain yield (Mohammed et al 2018); it allows for testing dominance and epistasis separately; and the computation and the interpretation are simple.…”

Section: Introductionmentioning

confidence: 99%

The impact of linkage disequilibrium and epistasis in the studies of inheritance based on Hayman’s diallel and generation mean analysis

Viana

¹

2022

Euphytica

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“…An example of this is provided by groundnut bud necrosis virus (GBNV; genus Orthotospovirus, family, Tospoviridae), which is indigenous to the Indian subcontinent and has a wide natural host range. After introduction of the originally South American crop tomato (see Section 6) to the Indian subcontinent and Southeast Asia, GBNV infected it causing a disastrous major epidemic [141][142][143]. Whether its spillover into tomato was directly from GBNV infection reservoirs in indigenous native plants, or indirectly via such reservoirs already present in other crops or introduced weeds, is unknown.…”

Section: Other Virus Diseasesmentioning

confidence: 99%

Disease Pandemics and Major Epidemics Arising from New Encounters between Indigenous Viruses and Introduced Crops

Jones

¹

2020

Viruses

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Virus disease pandemics and epidemics that occur in the world’s staple food crops pose a major threat to global food security, especially in developing countries with tropical or subtropical climates. Moreover, this threat is escalating rapidly due to increasing difficulties in controlling virus diseases as climate change accelerates and the need to feed the burgeoning global population escalates. One of the main causes of these pandemics and epidemics is the introduction to a new continent of food crops domesticated elsewhere, and their subsequent invasion by damaging virus diseases they never encountered before. This review focusses on providing historical and up-to-date information about pandemics and major epidemics initiated by spillover of indigenous viruses from infected alternative hosts into introduced crops. This spillover requires new encounters at the managed and natural vegetation interface. The principal virus disease pandemic examples described are two (cassava mosaic, cassava brown streak) that threaten food security in sub-Saharan Africa (SSA), and one (tomato yellow leaf curl) doing so globally. A further example describes a virus disease pandemic threatening a major plantation crop producing a vital food export for West Africa (cacao swollen shoot). Also described are two examples of major virus disease epidemics that threaten SSA’s food security (rice yellow mottle, groundnut rosette). In addition, brief accounts are provided of two major maize virus disease epidemics (maize streak in SSA, maize rough dwarf in Mediterranean and Middle Eastern regions), a major rice disease epidemic (rice hoja blanca in the Americas), and damaging tomato tospovirus and begomovirus disease epidemics of tomato that impair food security in different world regions. For each pandemic or major epidemic, the factors involved in driving its initial emergence, and its subsequent increase in importance and geographical distribution, are explained. Finally, clarification is provided over what needs to be done globally to achieve effective management of severe virus disease pandemics and epidemics initiated by spillover events.

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Genetic analysis of bud necrosis disease caused by groundnut bud necrosis virus (GBNV) in tomato (Solanum lycopersicum L.)

Cited by 9 publications

References 35 publications

The impact of linkage disequilibrium and epistasis in the studies of inheritance based on Hayman’s diallel and generation mean analysis

The impact of linkage disequilibrium and epistasis in the studies of inheritance based on Hayman’s diallel and generation mean analysis

The impact of linkage disequilibrium and epistasis in the studies of inheritance based on Hayman’s diallel and generation mean analysis

Disease Pandemics and Major Epidemics Arising from New Encounters between Indigenous Viruses and Introduced Crops

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