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Efficient direct plant regeneration from immature leaf roll explants of sugarcane (Saccharum officinarum L.) using polyamines and assessment of genetic fidelity by SCoT markers

Efficient direct plant regeneration from immature leaf roll explants of sugarcane (Saccharum officinarum L.) using polyamines and assessment of genetic fidelity by SCoT markers

In Vitro Cellular and Developmental Biology-Plant 54(4): 399-412

ISSN/ISBN: 1054-5476

DOI: 10.1007/s11627-018-9910-5

A rapid and efficient method for in vitro direct plant regeneration from immature leaf roll explants of Saccharum officinarum L. (sugarcane) cv. Co 86032 was developed by the application of exogenous polyamines (PA). The effect of explant source from apical meristems and pre-culture of explants in the dark on shoot regeneration was studied. Adventitious shoot regeneration occurred on the proximal regions of immature leaf roll explants when pre-incubated in the dark for 2 wk and the regeneration response was decreased from the middle to distal end. A higher number of direct shoots (130 primary shoots explant(-1)) and multiple shoots (657 secondary shoots explant(-1)), were obtained with a combination of spermidine (103.27 mu M), spermine (49.42 mu M), and putrescine (31.04 mu M) along with plant growth regulators. Shoot induction was increased up to twofold and multiplication was increased up to threefold in the medium supplemented with PA. Profuse rooting was observed in putrescine (93.12 mu M), spermidine (68.84 mu M), and spermine (24.71 mu M), with mean number of 57 roots. A twofold increase in the number of roots was observed in medium supplemented with PA with respect to control cultures, which facilitated the successful transplantation and acclimatization process of in vitro propagated sugarcane plants. Histology and scanning electron microscopy analyses supported adventitious direct shoot regeneration from immature leaf roll explants. The genetic stability of in vitro regenerated plants was confirmed using start codon targeted polymorphism marker system.

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Accession: 066368499

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