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Efficient transformation and regeneration of transgenic plants in commercial cultivars of Citrus aurantifolia and Citrus sinensis.
Transgenic Research 2023 September 14
Citrus is one of the major horticultural crops with high economic and nutraceutical value. Despite the fact that conventional research has developed numerous improved varieties, citriculture is still susceptible to various stresses and requires innovative solutions such as genetic engineering. Among all the currently available modern approaches, Agrobacterium-mediated transformation is the most efficient method for introducing desired traits in citrus. However, being a non-host for Agrobacterium, various citrus species, including Citrus aurantifolia and Citrus sinensis, are recalcitrant to this method. The available reports on Agrobacterium-mediated transformation of commercial citrus cultivars show very low transformation efficiency with poor recovery rates of whole transgenic plantlets. Here, we provide an efficient and reliable procedure of Agrobacterium-mediated transformation for both C. aurantifolia and C. sinensis. This protocol depends on providing callus-inducing treatment to explants before and during Agrobacterium co-cultivation, using optimum conditions for shoot regeneration and modifying in-vitro micrografting protocol to combat the loss of transgenic lines. As transgenic citrus shoots are difficult to root, we also developed the ideal conditions for their rooting. Using this protocol, the whole transgenic plantlets of C. aurantifolia and C. sinensis can be developed in about ~ 4 months, with transformation efficiency of 30% and 22% for the respective species.
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