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Ho Chi Minh City, Vietnam

Puig J.,Montpellier University | Pauluzzi G.,Montpellier University | Guiderdoni E.,CI RAD | Gantet P.,Montpellier University | Gantet P.,Vietnam Institute of Agricultural Sciences
Molecular Plant | Year: 2012

Plants adjust their development in relation to the availability of nutrient sources. This necessitates signaling between root and shoot. Aside from the well-known systemic signaling processes mediated by auxin, cytokinin, and sugars, new pathways involving carotenoid-derived hormones have recently been identified. The auxin-responsive MAX pathway controls shoot branching through the biosynthesis of strigolactone in the roots. The BYPASS1 gene affects the production of an as-yet unknown carotenoid-derived substance in roots that promotes shoot development. Novel local and systemic mechanisms that control adaptive root development in response to nitrogen and phosphorus starvation were recently discovered. Notably, the ability of the NITRATE TRANSPORTER 1.1 to transport auxin drew for the first time a functional link between auxin, root development, and nitrate availability in soil. The study of plant response to phosphorus starvation allowed the identification of a systemic mobile miRNA. Deciphering and integrating these signaling pathways at the whole-plant level provide a new perspective for understanding how plants regulate their development in response to environmental cues. © The Author 2012. Published by the Molecular Plant Shanghai Editorial Office in association with Oxford University Press on behalf of CSPB and IPPE, SIBS, CAS.

Teixeira Da Silva J.A.,Kagawa University | Chin D.P.,Chiba University | Van P.T.,Ehime University | Van P.T.,Vietnam Institute of Agricultural Sciences | Mii M.,Chiba University
Scientia Horticulturae | Year: 2011

Breeding orchids through traditional means is a lengthy process. Therefore, it would be advantageous if transgenic technologies could be applied for orchids to improve important traits such as novel flower colour, fragrance and shape, cut-flower longevity and flowering control, abiotic stress tolerance and resistance to pests and diseases. Even though there are several genetic transformation techniques available to orchid breeders, only two (Agrobacterium-mediated transformation and particle bombardment) have been successfully and consistently used thus far. This review aims to capture the full range of studies conducted on orchid transformation with a view of providing new perspectives for future molecular breeding programmes. © 2011 Elsevier B.V.

Van P.T.,Ehime University | Teixeira da Silva J.A.,Kagawa University | Ham L.H.,Vietnam Institute of Agricultural Sciences | Tanaka M.,Kagawa University
Scientia Horticulturae | Year: 2011

Magnetic fields (MFs) have been applied for the first time in orchid micropropagation. Protocorm-like bodies (PLBs) - approximately 3mm in diameter - first derived from leaf segment culture of Phalaenopsis Gallant Beau 'George Vazquez', were subcultured every 2 months, and served as initial explants. The proliferation of Phalaenopsis PLBs in liquid medium in the Miracle Pack ® culture system was affected by the action of different intensities and polarities of MFs: 0.1, 0.15 and 0.2Tesla (T) at North (N) and South (S) poles. The MF of 0.1T - S resulted in the greatest fresh weight of regenerated PLBs. The average number of neo-PLBs formed per clusters in the PLB treated by MF: 0.1-0.2T was decreased compared to the control exposed to natural MF (5×10 -6T). The proliferation of PLBs under 0.15T - MF at both N and S poles for 2 and 7 weeks demonstrated that a longer duration of exposure to an MF of 0.15T, regardless of the polarity, resulted in greater biomass of newly formed PLBs and smaller average number of newly formed PLBs. The S pole of MF had stronger effects on Phalaenopsis PLBs proliferation than the N pole did in all treatments. © 2011 Elsevier B.V.

Hossain M.M.,Chittagong University | Kant R.,Panjab University | Van P.T.,Ehime University | Van P.T.,Vietnam Institute of Agricultural Sciences | And 3 more authors.
Critical Reviews in Plant Sciences | Year: 2013

This review provides an informative and broad overview of orchid biotechnology, addressing several important aspects such as molecular systematics, modern breeding, in vitro morphogenesis, protoplast culture, flowering control, flower color, somaclonal variation, orchid mycorrhiza, pathogen resistance, virus diagnosis and production of virus-free plants, functional genomics, genetic transformation, conservation biotechnology and pharmaceutical biotechnology. This resource will provide valuable insight to researchers who are involved in orchid biology and floriculture, using biotechnology to advance research objectives. Producing an improved orchid through biotechnology for industrial purposes or to serve as a model plant for pure and applied sciences is well within reach and many of the current techniques and systems are already employed at the commercial production level. © 2013 Copyright Taylor and Francis Group, LLC.

Lefroy R.,Vietnam Institute of Agricultural Sciences
Appropriate Technology | Year: 2013

Farmers in Vietnam's central highlands or Tay Nguyen have tried various systems of farming to make a living such as coffee production and livestock, but nothing has been a success. Farmers are now trying cattle again but managing them in a different way, with success. The system hinges on confining cattle to lots and providing them with high quality feed. Extension workers recommend that part of the cropland is planted with nutritious forages suited to the area, such as varieties of elephant and napier grass, brachiaria and stylo. Also, farmers are encouraged to invest in more productive crossbreeds that respond better to the improved nutrition. The forages are cut and carried to the lots twice-a-day as part of an intensive fattening program which lasts around six months per animal. The legacy of coffee lives on though: an irrigation reservoir built for Chu Cuc's coffee plantations now serves dry-season forage cultivation.

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