Plant regeneration by somatic embryogenesis and organogenesis in commercial pineapple ( Ananas comosus L.)

TLDR: These studies provide a baseline for propagation, conservation, and genetic manipulation of elite pineapple germplasms.

Abstract: Axillary and terminal buds from suckers of Ananas comosus cv. Phuket were established on Murashige and Tucker-based (MT) medium with 2.0 mgl−1 (9.8 μM) indolebutyric acid, 2.0 mgl−1 (10.74 μM) naphthaleneacetic acid, and 2.0 mgl−1 (9.29 μM) kinetin, followed by multiplication on Murashige and Skoog-based (MS) medium containing 2.0 mgl−1 (8.87 μM) benzyladenine (BA) to provide a continuous supply of axenic shoots. Leaves, excised from such cultured shoots, produced adventitious shoots from their bases when these explants were cultured on MS medium containing 0.5 mgl−1 (2.26 μM) 2,4-dichlorophenoxyacetic acid (2,4-D) and 2.0 mgl−1 (8.87 μM) BA. Embryogenic callus was produced when leaf explants were cultured on MS medium with 3.0 mgl−1 (12.42 μM) 4-amino-3,5,6-trichloropicolinic acid (picloram). Somatic embryos developed into shoots following transfer of embryogenic tissues to MS medium with 1.0 mgl−1 (4.44 μM) BA. Cell suspensions, initiated by transfer of embryogenic callus to liquid MS medium with 1.0 mgl−1 (4.14 μM) picloram or 1.0 mgl−1 (4.52 μM) 2,4-D, also regenerated shoots by somatic embryogenesis, on transfer of cells to semisolid MS medium with 1.0 mgl−1 (4.44 μM) BA. All regenerated shoots rooted on growth regulator-free MS medium, prior to ex vitro acclimation and transfer to the glasshouse. These studies provide a baseline for propagation, conservation, and genetic manipulation of elite pineapple germplasms.