S. Shepherd

Publications8
h-index3
Citations35
Highly Influential Citations1
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Callus culture of Aspidosperma ramiflorum Muell . Arg . : growth and alkaloid production
TLDR
Callus culture of Aspidosperma ramiflorum was established in Murashige and Skoog medium and the alkaloid contents of 10-methoxy-geissoschizol, ram iflorine A and ramifloreine B, of bark and callus cultures were quantitatively compared by HPLC.
Sinningia allagophylla(Gesneriaceae): in vitro cultivation of a native plant of the Brazilian cerrado
TLDR
The growth response pattern obtained in vitro may be evidence of the adaptation of this species to soils of poor mineral composition as found in the Brazilian cerrado, as well as an indication that nitrogen levels play a key role for S. allagophylla growth.
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A model of seed dormancy in wild oats (Avena fatua) for investigating genotype x environment interactions
TLDR
Gene expression studies are being carried out on three A.fatua genotypes produced tinder different environmental conditions to investigate the role of specific genes in dormancy and genotype X environment interactions in relation to dormancy.
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IN VITRO CULTURE OF FOUR MEDICINAL ASTERACEAE SPECIES FOR AGROBACTERIUM RHIZOGENES TRANSFORMATION
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Micropropagation of a brazilian species Baccharis tridentata Vahl. (Asteraceae)
Diurnal fluctuations of metabolites in leaves of ‘Zesy002’ kiwifruit
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Biotechnology approaches for production of antiulcerogenic dihydro-epideoxyarteannuin B isolated from Artemisia annua L.
TLDR
The quantification of dihydro-epideoxyarteannuin B by Gas Chromatography coupled to Flame Detector Ionization (CG/FID) revealed an approximately fivefold increase in the production of this compound by normal roots kept under continuous darkness compared to Roots kept under 16 h light period.
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Genotype x environment interaction in expression of the VP-1 gene in relation to dormancy of Avena fatua seeds