Molecular
Biology and Genetics | Plant
Biotechnology |
EJB Electronic Journal of Biotechnology ISSN:
0717-3458 | Vol.4 No. 3, Issue of December 15,
2001. | © 2001 by Universidad Católica
de Valparaíso -- Chile | Received
June 22, 2001 / Accepted October 29, 2001 |
Analysis
of Uruguayan weedy rice genetic diversity using AFLP
molecular markers María
Teresa Federici* Unit of Biotechnology
National Institute of Agronomical Research Experimental Station "Las
Brujas" Ruta 48. Km. 10. Rincón del Colorado. Canelones, Uruguay
Tel: 598-2-0327-7641 Fax: 598-2-0327-7609 E- mail: maritefe@inia.org.uy Duncan
Vaughan Crop Evolutionary
Dynamics Laboratory National Institute of Agrobiological Resources (NIAR)
Kannondai 2- 1- 2, Tsukuba, Ibaraki, 305, Japan Tel: 81-298-38-7406 Fax:
81- 298- 38-7408 E- mail: duncan@abr.affrc.go.jp Norihiko
Tomooka Crop Evolutionary
Dynamics Laboratory National Institute of Agrobiological Resources (NIAR)
Kannondai 2- 1- 2, Tsukuba, Ibaraki, 305, Japan Tel: 81-298-38-7406 Fax:
81- 298- 38-7408 E-mail: tomooka@affrc.go.jp Akita
Kaga Crop Evolutionary Dynamics
Laboratory National Institute of Agrobiological Resources (NIAR) Kannondai
2- 1- 2, Tsukuba, Ibaraki, 305, Japan Tel: 81-298-38-7406 Fax: 81- 298-
38-7408 E-mail: kaga@affrc.go.jp Xin
Wang Wang Crop Evolutionary
Dynamics Laboratory National Institute of Agrobiological Resources (NIAR)
Kannondai 2- 1- 2, Tsukuba, Ibaraki, 305, Japan Tel: 81-298-38-7406 Fax:
81- 298- 38-7408 E-mail: xwang1@nias.affrc.go.jp Koji
Doi Crop Evolutionary Dynamics
Laboratory National Institute of Agrobiological Resources (NIAR) Kannondai
2- 1- 2, Tsukuba, Ibaraki, 305, Japan Tel: 81-298-38-7406 Fax: 81- 298-
38-7408 E-mail: kdoi@affrc.go.jp Marta
Francis Unit of Biotechnology
National Institute of Agronomical Research Experimental Station "Las
Brujas" Ruta 48. Km. 10. Rincón del Colorado. Canelones, Uruguay
Tel: 598-2-0327-7641 Fax: 598-2-0327-7609 E-mail: mfrancis@inia.org.uy Gonzalo
Zorrilla National
Institute of Agronomical Research (INIA) Experimental Station "Treinta
y Tres" Coronel J. Arenas 1986. Treinta y Tres, Uruguay Tel: 598-2-0452-2305
Fax: 598-2-0452-5701 E- mail: zorrilla@inia.org.uy Nestor
Saldain National Institute
of Agronomical Research (INIA) Experimental Station "Treinta y Tres"
Coronel J. Arenas 1986. Treinta y Tres, Uruguay Tel: 598-2-0452-2305 Fax:
598-2-0452-5701 E-mail: nsaldain@inia.org.uy *
Corresponding author Financial
support: Japan Cooperation Agency
(JICA)- Individual Training.
Keywords: clusters, dendrograms, polymorphic
bands, red rice, population dynamics. Weedy
rice is a serious problem in Uruguayan rice fields since intensification of rice
production started about 10 years ago. The genetic diversity of 26 weedy accessions
of weedy rice and 6 Uruguayan cultivars were
analyzed using AFLP (amplified fragment length polymorphisms)
methodology. Abundant polymorphisms were found among samples tested. Using different
methods of analysis three groups of samples were revealed. A relationship was
found between three groups and morphological traits. One group had a black hull,
purple apex and long awn (wild type traits) while another group had straw hull
and apex, and short or no awn (domestication traits). The third group included
the cultivars analyzed and some weedy rice samples. The weedy rice in this third
group is presumed to most closely mimic cultivated rice and may have recently
evolved. The results suggest that weedy rice adapts either to the natural environment
or to cultivation. The former type with black hull and long awn may be easy to
control because it can easily be seen. The later group may be difficult to control,
particularly since the weedy rices within the cluster consisting of cultivars
suggest that weedy rices are continually evolving in Uruguayan rice fields. The
AFLP technique is very effective for assessing genetic diversity within weedy
rice and will be very useful for fingerprinting of local cultivars of rice.
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