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To achieve adequate results in the in vitro multiplication of taro cultivars is required to standardize the culture conditions. The aim of this study was to determine the influence of growth regulators and physical state of the culture medium on in vitro multiplication of Colocasia esculenta clone 'INIVITC2001'. Five treatments involving indole acetic acid (IAA) and 6-benzylaminopurine (6-BAP) were established: 1.0 mg l-1IAA + 3.0 mg l-16-BAP, 3.0 mg l-16-BAP, 4.0 mg l-16-BAP, 5.0 mg l-16-BAP, 1.0 mg l-1IAA + 6.0 mg l 6-BAP. After 30 days of culture the multiplication coefficient was calculated. Furthermore, the effect on the physical state of the culture medium on this variable during three subcultures was determined. When the culture medium consisting of MS salts and vitamins with 4.0 mg l-1of 6-BAP was used the greater multiplication coefficient was obtained. Handling the physical state of the culture medium for three subcultures influenced the multiplication coefficient in each subculture, in average coefficient multiplication of three subcultures and the total number of explants obtained after three subcultures. With the culture medium in semisolid state better growth and higher explants multiplication coefficient was achieved. [ABSTRACT FROM AUTHOR]

Copyright of Revista Colombiana de Biotecnología is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In Cuba, the Xanthosoma genus is highly demanded in the preference of the population in relation to other edible aroids. The temporary immersion system (TIS) may constitute a micropropagation alternative to obtain high quality seed in this crop. The effect of two Semi-automated Culture Systems (SIT) and Constant Immersion Systems (CIS) with aeration through continuous bubbling in culture medium during the multiplication stage of axillaries shoot buds was evaluated. Results allowed demonstrating superiority in the efficiency of SIT regarding CIS in the sprout multiplication of clone 'Viequera'. Axillaries sprout buds cultivated in TIS showed the best results in the multiplication compared with CIS and the static culture system with passive renewal of the internal atmosphere was used as control. The culture conditions created in the temporary immersion system for in vitro multiplication of axillaries sprout buds achieved the highest multiplication coefficient (9.56). This in vitro culture system will allow increasing the multiplication coefficients in the micropropagation for seed production in this genus. [ABSTRACT FROM AUTHOR]

Copyright of Biotechnologie, Agronomie, Societe et Environnement is the property of Les Presses Agronomiques de Gembloux and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Colombiana de Biotecnología is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Biotechnologie, Agronomie, Societe et Environnement is the property of Les Presses Agronomiques de Gembloux and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Considering the limited availability of planting material in yam cv. 'White Guinea' (Dioscorea rotundata Point), mainly due to the tubers that are consumed are used as seed, have been developed methods for its micropropagation. However, field survival of the plants is very low, so the search of alternatives, among then, the production of minitubers, are necessaries. This work aimed to determine the effect of planting distance of the in vitro plants in green house on minitubers production. Four planting distances of in vitro plants (0.05×0.05 m, 0.10×0.10 m, 0.15×0.15 m, 0.20×0.20 m) were studied. In each treatment was determined: number of minitubers, fresh mass of tubers per plant and its category as planting material. The highest values of number of tubers per plant (3.83 and 3.12) were obtained with the distance × 0.10 0.10 × 0.15 m and 0.15 m, respectively. With the planting distance of 0.10 × 0.10m, the higher numbers of minitubers per square meter were achieved: 100, 110 and 90 in the categories with a fresh mass between 16.0 to 25.9 g, 26.0 to 35.9 g, 36.0 to 50.0 g (26.10%, 28.72% and 23.49%, respectively). These results, obtained for the first time in this crop, confirm the usefulness of minitubers production in greenhouse from in vitro plants of yam as an alternative to obtain planting material. [ABSTRACT FROM AUTHOR]

The need of producing high quality planting material has required the searching of new alternatives to increase the efficiency of in vitro propagation methods and their automation, such as Temporary Immersion Systems. This work has been carried out to increase the multiplication coefficient in mass propagation of hybrid 'FHIA-21' (AAAB) in Temporary Immersion Systems. Different culture medium volumes per explant and densities of planting materials per unit were studied at the same immersion frequency. The highest multiplication coefficient rate, (14.99 and 16.02 respectively), was obtained when 40 ml culture medium volume were used at a density of 70 explants/flask. The use of Temporary Immersion System allowed increasing the multiplication coefficient in hybrid 'FHIA-21' (AAAB) and the highest quality multiplication coefficient for rooting stage and further acclimatization in field conditions. [ABSTRACT FROM AUTHOR]