In vitro cultured primary roots derived from stem segments of cassava (Manihot esculenta) can behave like storage organs

Annals of Botany
Ricardo D MedinaLuis A Mroginski

Abstract

Cassava (Manihot esculenta) has three adventitious root types: primary and secondary fibrous roots, and storage roots. Different adventitious root types can also regenerate from in vitro cultured segments. The aim of this study was to investigate aspects of in vitro production of storage roots. Morphological and anatomical analyses were performed to identify and differentiate each root type. Twenty-nine clones were assayed to determine the effect of genotype on the capacity to form storage roots in vitro. The effects of cytokinins and auxins on the formation of storage roots in vitro were also examined. Primary roots formed in vitro and in vivo had similar tissue kinds; however, storage roots formed in vitro exhibited physiological specialization for storing starch. The only consistent diagnostic feature between secondary fibrous and storage roots was their functional differentiation. Anatomical analysis of the storage roots formed in vitro showed that radial expansion as a consequence of massive proliferation and enlargement of parenchymatous cells occurred in the middle cortex, but not from cambial activity as in roots formed in vivo. Cortical expansion could be related to dilatation growth favoured by hormone treatments. Sta...Continue Reading

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Citations

Jun 30, 2015·Plant Molecular Biology·Punchapat SojikulJarunya Narangajavana
Nov 9, 2015·Journal of Plant Research·Maliwan NaconsieJarunya Narangajavana
Apr 27, 2019·Applications in Plant Sciences·Jitrana KengkannaPatompong Saengwilai
Oct 1, 2020·BMC Biotechnology·Amitchihoué Franck SessouCorneille Ahanhanzo
Nov 17, 2016·Frontiers in Plant Science·M A KhanArthur Villordon
Apr 17, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·M ManokariMahipal S Shekhawat

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