\(\textit{In vitro}\) regeneration of \(\textit{Renanthera imschootiana}\) Rolfe from protocorm-like body

H’Yon Nie Bing; Tran Thai Vinh; Vu Kim Cong; Dang Thi Tham; Nong Van Duy

doi:10.15625/2615-9023/17155

Author affiliations

Authors

H’Yon Nie Bing Tay Nguyen Institute for Scientific Research, VAST, Vietnam
Tran Thai Vinh Tay Nguyen Institute for Scientific Research, VAST, Vietnam
Vu Kim Cong Tay Nguyen Institute for Scientific Research, VAST, Vietnam
Dang Thi Tham Tay Nguyen Institute for Scientific Research, VAST, Vietnam
Nong Van Duy Tay Nguyen Institute for Scientific Research, VAST, Vietnam

DOI:

https://doi.org/10.15625/2615-9023/17155

Keywords:

Conservation, epiphytic orchid, humic acid, plant growth regulators, silver nanoparticles

Abstract

Renanthera imschootiana Rolfe is an extremely rare and endangered tropical epiphytic orchid. Studies on in vitro culture of R. imschootiana were conducted in order to conserve and increase the genetic pool of this wild orchid species. In this study, the effect of plant growth regulators (BA and NAA), ripe bananas in combination with potato, humic acid, and silver nanoparticles (AgNPs) were investigated to find a suitable condition for in vitro plant regeneration from R. imschootiana protocorm-like body (PLB). The results showed that after 45 days of culture, MS medium supplemented with 100 g ripe banana/liter and 100 g potato/liter was suitable for regenerating shoots from the protocorm-like body (PLB) (17.56 shoots/PLBs and 100.00% of shoot-regenerating PLBs); MS medium supplemented with 2.0 mg/L BA, 0.3 mg/L NAA and 4 ppm AgNPs was the most suitable for the growth of shoots after 60 days of culture (10.00 leaves/shoot and shoot length of 4.22 cm). The in vitro shoots were transferred to half-strength MS supplemented with humic acid and AgNPs to investigate the root formation of R. imschootiana. After 60 days of culture, the best rooting was obtained at 2.0 mg/L humic acid and 6 ppm AgNPs (8.33 roots/shoot; root length of 4.00 cm and 100.00% root formation). The findings suggest that the in vitro micropropagation from R. imschootiana protocorm-like body provides a useful alternative tool for the conservation of this endangered species.

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