NDLI: Polygene mapping as a tool to study the physiology of potato tuberization and dormancy

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Polygene mapping as a tool to study the physiology of potato tuberization and dormancy

Content Provider	Springer Nature Link
Author	Ewing, E. E. Simko, I. Omer, E. A. Davies, P. J.
Copyright Year	2004
Abstract	Efforts to breed for the ability to tuberize under long days or for the length of tuber dormancy should benefit not only from information on the location of genes associated with these traits, but also from an understanding of the hormones the genes control. Understanding the role of the respective genes is a logical step in developing the best breeding strategy, both for conventional breeding and for gene transfer using molecular techniques. Polygene mapping affords a way to achieve such understanding and is also a tool to study the physiology of potato tuberization and potato tuber dormancy. The addition of DNA markers to a plant population facilitates the mapping of polygenes that control quantitatively inherited traits segregating in the population. A quantitative trait locus denotes a region of chromosome that is linked to the marker gene and which has a significant effect on the quantitative trait under study. Our approach has been to find the quantitative trait loci associated with tuberization and tuber dormancy in a segregating diploid population, and then to map the population for quantitative trait loci associated with levels of hormones implicated in the control of these two traits. We are using a population derived from a hybrid between haploidSolanum tuberosum andS. berthaultii that was backcrossed to a different haploidS. tuberosum. We have found ten quantitative trait loci for the ability to tuberize under long days and eight quantitative trait loci for tuber dormancy. In the same population we have found one or more quantitative trait loci for polyamines, abscisic acid, tuberonic acid, tuberonic acid glucoside, zeatin riboside, and gibberellin A$_{1}$. Some of the hormone quantitative trait loci have coincided with quantitative trait loci for tuberization or dormancy. Implications of such commonality are discussed, along with the usefulness and limitations of the methods.Todo lo que se haga para mejorar la habilidad de tuberizar bajo días largos o para la duratión de la latencia debería servir no sólo como información sobre la localización de los genes asociados con estos caracteres, sino también para comprender el control que ejercen los genes sobre las hormonas. El conocimiento del rol de los respectivos genes es un paso lógico para desarrollar una mejor estrategia, tanto para el mejoramiento convencional como para la transferencia de genes por medio de técnicas moleculares. El mapeo poligénico proporciona una forma de desarrollar dicho conocimiento y también constituye una herramienta para estudiar la fisiología de la tuberización y la latencia del tubérculo de papa. Añadir marcadores de ADN a una población de plantas facilita el mapeo de los poligenes que controlan cuantitativamente los caracteres segregantes heredados en una población. Un locus de caracteres cuantitativos senala una región del cromosoma que está ligada al gen marcador, el cual tiene un efecto significativo sobre el carácter cuantitativo en estudio. Nuestro enfoque ha sido ubicar los locus de caracteres cuantitativos asociados a la tuberización y latencia del tubérculo en una población diploide segregante y luego hacer un mapeo de la población para ubicar los locus de caracteres cuantitativos asociados con los niveles de hormonas implicadas en el control de estos dos caracteres. Estamos utilizando una población derivada de un híbrido entreSolanum tuberosum haploide yS. berthaultii que fue retrocruzado a un haploide diferente deS. tuberosum. Hemos encontrado diez locus de caracteres cuantitativos para habilidad de tuberización bajo días largos y ocho para latencia. En la misma población hemos encontrado uno o más locus de caracteres cuantitativos para poliaminas, ácido abscísico, ácido tuberónico, glucósido de ácido tuberónico, zeatina ribósido y giberelina A$_{1}$. Algunos de los locus para caracteres cuantitativos de hormonas coincidieron con los locus de caracteres cuantitativos para tuberización o para dormancia. Se discuten las implicancias de tales hechos comunes, lo mismo que la utilidad y limitaciones de tales métodos.
Starting Page	281
Ending Page	289
Page Count	9
File Format	PDF
ISSN	1099209X
Journal	American Potato Journal
Volume Number	81
Issue Number	4
e-ISSN	18749380
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Institution	Potato Association of America
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Life Sciences Plant Sciences Animal Genetics and Genomics Agriculture Plant Physiology Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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