Cycads in vitro

Silva, Jaime A. Teixeira da; Woodenberg, Wynston Ray; Zeng, Songjun

doi:10.3329/ptcb.v24i2.23562

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Singh & Khuraijam (2010) also mentioned illegal trade and Cycas habitat destruction as two major threats responsible for depletion of its population in the wild of Sikkim and West Bengal, India. Similar threats are also mentioned by researchers worldwide as contributing to reduction of Cycad populations (da Silva et al 2014;Khuraijam & Singh 2015;Demiray et al 2017).…”

Section: Threats To C Pectinata In Bdnpsupporting

confidence: 55%

Status and conservation needs of Cycas pectinata Buch.-Ham. in its natural habitat at Baroiyadhala National Park, Bangladesh

Hossain

et al. 2021

J. Threat. Taxa

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The widespread cycad Cycas pectinata was first discovered in the Bengal region by William Griffith in Baroiyadhala forest of Chattogram in 1838. In Bangladesh, this species is confined to a few hills at Baroiyadhala, Sitakunda upazila of Chattogram district. Though the Baroiyadhala forests were declared a national park in 2010, the loss of this native gymnosperm from this forest is alarming. The present study aimed to assess the status of C. pectinata populations in its native range, identify the drivers responsible for ongoing losses, and identify locations of C. pectinata occurrence in Baroiyadhala National Park suitable for in situ conservation. A random quadrat survey with 21 sample plots of 100 × 100 m was conducted during April–June 2018 in Baroiyadhala National Park. Population and growth data for C. pectinata were collected from each sample plot, along with observations of disturbances. Four focus group discussions (FGDs) were conducted with adjacent local people. The study revealed presence of 12 C. pectinata individuals per hectare and five seedlings per hectare in the study area, and significant numbers of dead and burned Cycas were also found in some sites. Based on density, five C. pectinata hotspots were identified for in situ conservation programs. Habitat destruction, indiscriminate fire, and unsustainable harvesting of leaves and male and female cones are responsible for rapid declines in C. pectinata populations in its wild habitat. Measures for protection and restoration of the species are creating awareness among the local people about ecological importance of this species; enhancing protection; banning trade of Cycas; creating opportunities of sustainable livelihood for local people to reduce dependency on forests.

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Section: Threats To C Pectinata In Bdnpsupporting

confidence: 55%

Status and conservation needs of Cycas pectinata Buch.-Ham. in its natural habitat at Baroiyadhala National Park, Bangladesh

Hossain

et al. 2021

J. Threat. Taxa

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Comparative Biology of Cycad Pollen, Seed and Tissue - A Plant Conservation Perspective

Jayanthi

Benson²,

Xaba

et al. 2018

Bot. Rev.

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Cycads are the most endangered of plant groups based on IUCN Red List assessments; all are in Appendix I or II of CITES, about 40% are within biodiversity ‘hotspots,’ and the call for action to improve their protection is long-standing. We contend that progress in this direction will not be made until there is better understanding of cycad pollen, seed and tissue biology, which at the moment is limited to relatively few (<10%) species. We review what is known about germplasm (seed and pollen) storage and germination, together with recent developments in the application of contemporary technologies to tissues, such as isotype labelling, biomolecular markers and tissue culture. Whilst progress is being made, we conclude that an acceleration of comparative studies is needed to facilitate the integration of in situ and ex situ conservation programmes to better safeguard endangered cycads.

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Simplified Regeneration Protocol for Cycas revoluta Thunb. Mature Zygotic Embryos

Naderi

Mohaiseni

Silva³

et al. 2015

Not Sci Biol

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Mature zygotic embryos of Cycas revoluta Thunb. were used as explants to investigate direct and indirect organogenesis. Explants were incubated on half-strength Murashige and Skoog (½ MS) basal medium supplemented with various plant growth regulators, singly or in combination (all at 0.5 mg l-1): 6-benzyladenine (BA), kinetin (Kin), 2,4-dichlorophenoxyacetic acid (2,4-D), Kin×2,4-D, BA×Kin and BA×2,4-D. Cultures were placed at a low light intensity (4 µmol m-2 s-1 PPFD). Adventitious shoot regeneration was observed in the presence of 0.5 mg l-1BA after 35 days. The highest number of direct and indirect shoots per zygotic embryo was 3.67 and 29.67, respectively. Roots were induced on indirect shoots by continuous culture on rooting medium (½ MS,‏ 0.1 mg l-1 1-naphthaleneacetic acid) and hardened successfully in perlite. Each rooted plantlet with pinnate leaves and a primary tap root was individually isolated and acclimatized 185 days after the beginning of culture, with a 10% success rate.

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Cycads in vitro

Cited by 3 publications

References 7 publications

Status and conservation needs of Cycas pectinata Buch.-Ham. in its natural habitat at Baroiyadhala National Park, Bangladesh

Status and conservation needs of Cycas pectinata Buch.-Ham. in its natural habitat at Baroiyadhala National Park, Bangladesh

Comparative Biology of Cycad Pollen, Seed and Tissue - A Plant Conservation Perspective

Simplified Regeneration Protocol for Cycas revoluta Thunb. Mature Zygotic Embryos

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