TY - JOUR
T1 - Shoot regeneration and determination of iridoid levels in the medicinal plant Castilleja tenuiflora Benth.
AU - Martínez-Bonfil, Blanca P.
AU - Salcedo-Morales, Guadalupe
AU - López-Laredo, Alma R.
AU - Ventura-Zapata, Elsa
AU - Evangelista-Lozano, Silvia
AU - Trejo-Tapia, Gabriela
N1 - Funding Information:
Acknowledgments This work was supported by the Secretaría de Investigación y Posgrado del IPN-México (SIP-IPN Grant 20100308) and by Fondo Mixto de Fomento a la Investigación Científica y Tecnológica CONACYT-Gobierno del Estado de Morelos (Grant MOR-2007-C01-79409). The authors are grateful to SIBE and EDI (IPN). The authors thank Mr. I. R. Velázquez Zavala for technical assistance.
PY - 2011/11
Y1 - 2011/11
N2 - Castilleja tenuiflora is a medicinal plant that grows in pine-oak woods primarily in southern and central Mexico. It is highly valued for its medicinal properties, which have been attributed to aucubin-like iridoids. In the present study, we developed an efficient protocol for in vitro shoot proliferation and ex vitro rooting of C. tenuiflora. Using a colorimetric method, we determined total iridoid contents of various different tissues of propagated plants. The shoots were induced from nodal explants cultured on Murashige and Skoog (MS) (1962) medium supplemented with indole-3-butyric acid (IBA) (0 and 0.5 μM) and different concentrations of thidiazuron (TDZ), 6-benzyladenine (BA), or kinetin (KIN) (0-20 μM). Of the cytokinins tested, KIN was more effective for shoot induction than TDZ or BA, and the highest shoot proliferation rate was achieved with 5 μM KIN (4 shoots per explant). Plantlets were rooted on MS medium, nutrient solution, or potting mix, alone or in combination with auxins. The best responses (100% rooting efficiency) were obtained by dipping shoots in half-strength MS medium containing 7.5 μM IBA before transfer to potting mix. On average, each shoot formed 9 roots of 39.3 ± 3.8 mm in length after 21 days. These roots appeared to be more functional than those that developed in nutrient solution, and were associated with a high survival rate (95%) during acclimatization and cultivation in a greenhouse, where flowering occurred after 4 months. Propagated plants accumulated iridoids, thus representing a potential source of pharmacologically useful compounds.
AB - Castilleja tenuiflora is a medicinal plant that grows in pine-oak woods primarily in southern and central Mexico. It is highly valued for its medicinal properties, which have been attributed to aucubin-like iridoids. In the present study, we developed an efficient protocol for in vitro shoot proliferation and ex vitro rooting of C. tenuiflora. Using a colorimetric method, we determined total iridoid contents of various different tissues of propagated plants. The shoots were induced from nodal explants cultured on Murashige and Skoog (MS) (1962) medium supplemented with indole-3-butyric acid (IBA) (0 and 0.5 μM) and different concentrations of thidiazuron (TDZ), 6-benzyladenine (BA), or kinetin (KIN) (0-20 μM). Of the cytokinins tested, KIN was more effective for shoot induction than TDZ or BA, and the highest shoot proliferation rate was achieved with 5 μM KIN (4 shoots per explant). Plantlets were rooted on MS medium, nutrient solution, or potting mix, alone or in combination with auxins. The best responses (100% rooting efficiency) were obtained by dipping shoots in half-strength MS medium containing 7.5 μM IBA before transfer to potting mix. On average, each shoot formed 9 roots of 39.3 ± 3.8 mm in length after 21 days. These roots appeared to be more functional than those that developed in nutrient solution, and were associated with a high survival rate (95%) during acclimatization and cultivation in a greenhouse, where flowering occurred after 4 months. Propagated plants accumulated iridoids, thus representing a potential source of pharmacologically useful compounds.
KW - Cytokinins
KW - Ex vitro rooting
KW - Iridoids
KW - Orobanchaceae
KW - Shoot proliferation
UR - http://www.scopus.com/inward/record.url?scp=80053997678&partnerID=8YFLogxK
U2 - 10.1007/s11240-011-9970-2
DO - 10.1007/s11240-011-9970-2
M3 - Artículo
SN - 0167-6857
VL - 107
SP - 195
EP - 203
JO - Plant Cell, Tissue and Organ Culture
JF - Plant Cell, Tissue and Organ Culture
IS - 2
ER -