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Mutation Breeding in Tomato: Advances, Applicability and Challenges

1
Department of Biology, Oberlin College, Oberlin, OH 44074, USA
2
National Agri-Food Biotechnology Institute (NABI), Mohali, Punjab 140308, India
3
National Research Center on Plant Biotechnology, New Delhi, Delhi 110012, India
4
Division of Plant Pathology, ICAR-IARI, New Delhi, Delhi 110001, Inida
5
National Bureau of Plant Genetic Resources, New Delhi, Delhi 110012, India
6
Faculté des sciences de l’agriculture et de l’alimentation (FSAA), Université Laval, Quebec, QC G1V 0A6, Canada
*
Authors to whom correspondence should be addressed.
Plants 2019, 8(5), 128; https://doi.org/10.3390/plants8050128
Received: 1 April 2019 / Revised: 9 May 2019 / Accepted: 11 May 2019 / Published: 14 May 2019
(This article belongs to the Special Issue Advances in Plant Mutagenesis Research)
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Abstract

Induced mutagenesis is one of the most effective strategies for trait improvement without altering the well-optimized genetic background of the cultivars. In this review, several currently accessible methods such as physical, chemical and insertional mutagenesis have been discussed concerning their efficient exploration for the tomato crop improvement. Similarly, challenges for the adaptation of genome-editing, a newly developed technique providing an opportunity to induce precise mutation, have been addressed. Several efforts of genome-editing have been demonstrated in tomato and other crops, exploring its effectiveness and convenience for crop improvement. Descriptive data compiled here from such efforts will be helpful for the efficient exploration of technological advances. However, uncertainty about the regulation of genome-edited crops is still a significant concern, particularly when timely trait improvement in tomato cultivars is needed. In this regard, random approaches of induced mutagenesis are still promising if efficiently explored in breeding applications. Precise identification of casual mutation is a prerequisite for the molecular understanding of the trait development as well as its utilization for the breeding program. Recent advances in sequencing techniques provide an opportunity for the precise detection of mutagenesis-induced sequence variations at a large scale in the genome. Here, we reviewed several novel next-generation sequencing based mutation mapping approaches including Mutmap, MutChromeSeq, and whole-genome sequencing-based mapping which has enormous potential to accelerate the mutation breeding in tomato. The proper utilization of the existing well-characterized tomato mutant resources combined with novel mapping approaches would inevitably lead to rapid enhancement of tomato quality and yield. This article provides an overview of the principles and applications of mutagenesis approaches in tomato and discusses the current progress and challenges involved in tomato mutagenesis research. View Full-Text
Keywords: genome-editing; mutagenesis approaches; mutmap; mutation breeding; next generation sequencing tools; tomato genome-editing; mutagenesis approaches; mutmap; mutation breeding; next generation sequencing tools; tomato
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Chaudhary, J.; Alisha, A.; Bhatt, V.; Chandanshive, S.; Kumar, N.; Mir, Z.; Kumar, A.; Yadav, S.K.; Shivaraj, S.M.; Sonah, H.; Deshmukh, R. Mutation Breeding in Tomato: Advances, Applicability and Challenges. Plants 2019, 8, 128.

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