NDLI: Effects of Synthetic Phenylurea and Nitroguanidine Cytokinins on Dormancy Break and Sprout Growth in Russet Burbank Minitubers

Content Provider	Springer Nature Link
Author	Suttle, Jeffrey C.
Copyright Year	2007
Abstract	Minitubers often exhibit a more protracted dormant period relative to their field-grown counterparts and this can have a detrimental impact on plant establishment. Treatment of dormant Russet Burbank minitubers with the synthetic cytokinins N-(2-chloro-4-pyridyl)-N′-phenylurea (CP) or 1-(α-ethylbenzyl)-3-nitroguanidine (NG) resulted in the premature termination of tuber dormancy. In contrast, treatment with the thidiazoyl-urea cytokinin TZ did not stimulate sprouting. Both CP and NG were more effective than the naturally occurring cytokinin zeatin and, unlike zeatin, both stimulated sprouting in minitubers during early storage. Unlike treatment with gibberellic acid (GA) which often induced excessive sprout growth, sprouts developing from minitubers treated with either cytokinin were short, thick, and robust. Upon transfer to room temperature, the endogenous content of ABA in apical bud periderm discs isolated from control minitubers declined more than 60% over a 15 day period. Treatment with either CP or NG had no appreciable effect on this decline while treatment with GA diminished the decrease in ABA content. Treatment with either synthetic cytokinin resulted in a large and sustained increase in endogenous ethylene production that was detectable immediately prior to visible sprout growth. In contrast, GA treatment resulted in a much smaller increase that was observed after sprout growth commenced. These results indicate that either CP or NG treatment can be effectively used to prematurely terminate tuber dormancy and induce sprout growth.Los mini tubérculos exhiben a menudo un prolongado periodo de latencia con relación a sus contrapartes que han crecido en el campo y esto puede tener un impacto perjudicial en el establecimiento de la planta. El tratamiento de los mini tubérculos latentes de Russet Burbak con citoquininas sintéticas N-(2-cloro-4-piridil)-N′-fenilurea (CP) o 1-(α-etilbenzil)-3-nitroguanidina (NG) dieron como resultado el final prematuro de la latencia. Contrariamente, el tratamiento con tidiazoil-urea citoquinina TZ, no estimuló el brotamiento. La CP y el NG fueron más efectivos que la citoquinina zeatina que se presenta en forma natural y a diferencia de la zeatina, ambos estimularon el brotamiento de los mini tubérculos durante el inicio del almacenaje. A diferencia del tratamiento con ácido giberélico (GA), el cual a menudo induce excesivo crecimiento del brote, los brotes que se desarrollan a partir de los mini tubérculos tratados con cualquier citoquinina fueron cortos, gruesos y robustos. Después de la transferencia a la temperatura ambiente, el contenido endógeno ABA, en los discos del peridermo del brote apical aislado de mini tubérculos testigo, disminuyo más del 60% en un periodo de 15 días. El tratamiento sea con CP o NG no tuvo efecto apreciable sobre esta disminución mientras que el tratamiento con GA disminuyó la reducción del contenido de ABA. El tratamiento con cualquiera de las dos citoquininas sintéticas dio como resultado un sostenido incremento de la producción de etileno endógeno que fue detectable inmediatamente antes del crecimiento visible del brote. En contraste, el tratamiento con GA resultó en un incremento menor que fue observado después que comenzó el crecimiento del brote. Estos resultados indican que cualquiera de los tratamientos con CP o con NG pueden usarse efectivamente para terminar con la latencia del tubérculo e inducir el crecimiento del brote.
Starting Page	121
Ending Page	128
Page Count	8
File Format	PDF
ISSN	1099209X
Journal	American Potato Journal
Volume Number	85
Issue Number	2
e-ISSN	18749380
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-02-29
Publisher Institution	Potato Association of America
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hormones Potato Solanum tuberosum Sprouting Plant Pathology Plant Physiology Agriculture Animal Genetics and Genomics Plant Sciences Life Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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