In vitro somatic embryogenesis from immature female flower of Musa AAB cv. Chenichampa and molecular analysis of transcript factors (TFs) during somatic embryogenesis

Somatic embryogenesis (SE) is a process where somatic embryos can form differentiated tissues and regenerate into new plants. Efficient SE and liquid culture system for large-scale production of banana cv. Chenichampa is presented. The embryo maturation media (M3) was modified with different organic...

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Published in:Plant cell, tissue and organ culture tissue and organ culture, 2020-08, Vol.142 (2), p.339-351
Main Authors: Natarajan Nandhakumar, Sundararajan Sathish, Suresh, C P, Ramalingam Sathishkumar
Format: Article
Language:English
Subjects:
Additives
Cell culture
Cultivars
Embryonic growth stage
Embryos
Explants
Flowers
Fruits
Liquid culture
Micropropagation
Musaceae
Plantlets
Polymerase chain reaction
Propagation
Somatic embryogenesis
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Summary:Somatic embryogenesis (SE) is a process where somatic embryos can form differentiated tissues and regenerate into new plants. Efficient SE and liquid culture system for large-scale production of banana cv. Chenichampa is presented. The embryo maturation media (M3) was modified with different organic additives and high-frequency somatic embryos were observed in M3 media supplemented with CH: Gln (100:150 mg/L) resulting in a tenfold increase in somatic embryo formation as compared to the control. The generated plantlets were hardened and polymerase chain reaction (PCR) with SSR primers were used to confirm the genetic fidelity of the plantlets. To understand the molecular mechanism of SE, expression patterns of transcript factors (TFs) in respect of embryogenic calli (EC) and embryogenic cell suspension (ECS) was also studied. Transcript factor (TF) such as BBM has been reported to play a significant part in converting explants to EC. The higher expression of TFs MaBBM1, MaBBM2, MaWUS2, and MaVP1 in the EC and MaBBM2 and MaWUS2 in ECS, suggested that these genes could play a crucial role in SE. The protocol developed in this commercially important banana cv. Chenichampa could be highly useful for large-scale micropropagation and genetic manipulation studies which can be adapted to other cultivars lacking in male flowers.Key messageAn efficient micropropagation system using SE for banana cultivar Chenichampa (Musa AAB) is presented. Differential expression profiles of TFs during various stages of SE studied. Organic additives enhanced the SE and this optimized protocol will serve as a platform for developing efficient propagation system for banana cultivars that lack male flowers.
ISSN:0167-6857
1573-5044
DOI:10.1007/s11240-020-01866-7