Abstract
Citrus is the most important tree fruit crop in the world. However, citrus production is affected by both biotic and abiotic stresses, including drought, extreme temperature, salinity, citrus canker, citrus tristeza virus, and Huanglongbing (or citrus greening), among others. These stresses can severely influence growth and development of both rootstocks and/or scions of citrus trees, thus reducing both fruit production and fruit quality. Modern advances in the tools of plant biotechnology and advances in genomics play important roles in understanding how citrus crops can cope with diseases and adverse environmental conditions. Within the last decades, much progress has been made in identifying and cloning of genes involved in resistance to biotic and abiotic stresses as well in genetic transformation of Citrus and its related genera, such as Poncirus trifoliata and Fortunella spp. In this review, we will provide information on advances and insights on genetic transformation protocols as well as availability of characterized genes involved in resistance to both abiotic and biotic stresses. This will be followed with a discussion on perspectives of future developments in this field.
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