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A review of induction of mutations in fruits of tropical and subtropical regions

Mohan Jain, S.
Acta horticulturae 2002 no.575
Citrus, Food and Agriculture Organization, bananas, fruit crops, fruits, genetic markers, germination, mutagenesis, mutants, organogenesis, research projects, screening, seedless varieties, somatic embryogenesis, subtropics, tissue culture
Induction of mutations is an effective approach for enhancing natural genetic resources. FAO/IAEA Coordinated Research Projects (CRP) have been established on tropical and subtropical fruits as well as on banana, and the Technical Co-operation (TC) sub-Regional Project on date palm. The objectives are to improve these fruit crops by induced mutations. These programs have four major components: in vitro culture, radiation induction of mutations, mutation screening, and characterization of mutants with molecular markers. In most of the important fruit crops, tissue culture is well established for plant regeneration either via somatic embryogenesis or organogenesis. Since somatic embryo cultures often originate from a single cell, it is an ideal system for induction of mutations as it helps in preventing chimerism. The rate of somatic embryo germination is very poor, which has become a major hurdle for large-scale plant multiplication of desirable induced mutants. The major focus will be on the development of mutant lines of fruits with improved tolerance against abiotic and biotic stresses, seedlessness e.g. in guava and citrus.