NDLI: In Vitro Osmotic Stress Tolerance in Potato and Identification of Major QTLs

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In Vitro Osmotic Stress Tolerance in Potato and Identification of Major QTLs

Content Provider	Springer Nature Link
Author	Gorji, Ahmad Mousapour Matyas, Kinga Klara Dublecz, Zsuzsanna Decsi, Kincso Cernak, Istvan Hoffmann, Borbala Taller, Jas Polgar, Zsolt
Copyright Year	2012
Abstract	Identification of quantitative trait loci (QTL) responsible for stress tolerance could help to develop new tolerant potato cultivars through markers-assisted selection. The objective of the research was to identify and map loci that may play major role in the control of osmotic stress tolerance in potato under in vitro vegetative growth conditions. Mannitol-induced osmotic stress response of cv. White Lady and breeding line S440 as well as their 85F$_{1}$ progeny for root number and root length under in vitro conditions was investigated. Interval mapping based on 200 informative markers produced a molecular marker map comprising 13 linkage groups for White Lady and 14 for S440. In total, 14 QTLs with LOD > 2 were identified from which 6 were confirmed as major QTLs. Of those six, three were associated with root length and three with root number. For root length, one major QTL was identified on chromosome XII (LOD = 4.8), which explained 52.3 % of the phenotypic variance. Two other major QTLs from an unidentified chromosome explained 64.9 and 51 % of the phenotypic variance with LODs of 5.34 and 4.8, respectively. For root number, one QTL with 19.2 % of the phenotypic variance (LOD of 2.9) was tentatively identified on chromosome IX, while another was putatively identified on chromosome XII (LOD of 2.4), together explaining 26.8 % of the phenotypic variance. La identificación de loci de rasgos cuantitativos (QTL) responsables de la tolerancia al agobio podría ayudar a desarrollar nuevas variedades de papa tolerantes mediante selección asistida por marcadores. El objetivo de la investigación fue identificar y crear un mapa de loci que pudiera jugar un papel importante en el control de la tolerancia al agobio osmótico en papa bajo condiciones de crecimiento vegetativo in vitro. Se investigó la respuesta del agobio osmótico inducido por manitol de la variedad White Lady y de la línea de mejoramiento S440, así como de su progenie 85 de F1, para número y longitud de raíces, bajo condiciones in vitro. Mapeando a intervalos con base en 200 marcadores informativos se produjo un mapa de marcadores moleculares compuesto por 13 grupos ligados para White Lady y 14 para S440. En total, se identificaron 14 QTL con LOD > 2, de los cuales 6 fueron confirmados como QTL’s mayores. De esos seis, se asociaron tres con longitud de raíz y tres con número de raíces. Para longitud de raíz, se identificó un QTL mayor en el cromosoma XII (LOD = 4.8), lo que explicó 52.3 % de la varianza fenotípica. Otros dos QTL mayores de un cromosoma no identificado explicaron 64.9 y 51 % de la varianza fenotípica con LODs de 5.34 y 4.8, respectivamente. Para el número de raíces, un QTL con 19.2 % de la varianza fenotípica (LOD de 2.9) se identificó tentativamente en el cromosoma IX, mientras que otro se identificó presumiblemente en el cromosoma XII (LOD de 2.4), juntos explicando 26.8 % de la varianza fenotípica.
Starting Page	453
Ending Page	464
Page Count	12
File Format	PDF
ISSN	1099209X
Journal	American Potato Journal
Volume Number	89
Issue Number	6
e-ISSN	18749380
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-31
Publisher Institution	Potato Association of America
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Osmotic stress QTL markers Tetraploid potato Root number Root length Plant Sciences Agriculture Plant Genetics & Genomics Plant Breeding/Biotechnology Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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