Abstract
The effect of 2,4-D on tuberization, yield and the starch content of potato tubers produced on stem segments was examined. Potato stem segments were cultured in nutrient agar containing 2,4-D concentrations ranging from 10−7 M to 2 × 10−3 M. The stem segments were incubated in the dark at 25° C and examined after 15 days. The degree of tuberization on stem segments cultured in media containing 10−7 M and 10−6 M 2,4-D was higher than on the control stem segments. Mainly long stolons were observed on stem segments cultured in media containing 10−4 M and 2 × 10−3 M 2,4-D. The percent starch (dry wt. basis) in stolons was higher than that in tubers. However, the total starch content of tubers per stem segment cultured in media containing 10−7 M and 10−6 M 2,4-D was significantly higher than that of stolons obtained from stem segments cultured in media containing higher concentrations of 2,4-D. The total starch content of tubers, except those produced on stem segments cultured in media containing 10−7 M 2,4-D, decreased steadily with increasing concentration of 2,4-D in the culture media.
Resumen
Se estudió el efecto de 2,4-D en la tuberización, rendimiento y contenido de almidón de tubérculos de papa producidos en segmentos de tallo. Los segmentos de tallo de papa fueron cultivados en medio nutritivo de agar con concentraciones de 2,4-D variando de 10−7 M a 2 × 10−3 M. Los segmentos de tallo fueron inoculados en la oscuridad a 25°C y analizados después de 15 días. El grado de tuberización en segmentos de tallos cultivados en medios con 10−7 M y 10−6 M de 2,4-D fue mayor que con los segmentos de tallos usados como testigo. Se observaron estolones largos principalmente en segmentos de tallos cultivados en medios con 10−4 M y 2 × 10−3 M de 2,4-D. El porcentaje de almidón (en base a peso seco) en estolones fue mayor que en tubérculos. Sin embargo, el contenido total de almidón de tubérculos por segmento de tallo cultivados en medios que contenían 10−7 M y 10−6 M de 2,4-D fue significativamente mayor que aquellos de estolones obtenidos de segmentos de tallo cultivados en medios con concentraciones mayores de 2,4-D. El contenido total de almidón de los tubérculos, excepto aquellos producidos en segmentos de tallo cultivados en medio con concentración 10−7 M de 2,4-D, disminuyó uniformemente a medida que aumentaron las concentraciones de 2,4-D en el medio de cultivo.
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Mangat, B.S., Kerson, G. & Wallace, D. The effect of 2,4-d on tuberization and starch content of potato tubers produced on stem segments culturedin vitro . American Potato Journal 61, 355–361 (1984). https://doi.org/10.1007/BF02854537
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DOI: https://doi.org/10.1007/BF02854537