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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 4, No. 3, 2001, pp. 130-145
Bioline Code: ej01026
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 4, No. 3, 2001, pp. 130-145

 en Analysis of Uruguayan weedy rice genetic diversity using AFLP molecular markers
Federici, María Teresa; Vaughan, Duncan; Tomooka, Norihiko; Kaga, Akita; Wang, Xin Wang; Doi, Koji; Francis, Marta; Zorrilla, Gonzalo & Saldain, Nestor


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.

clusters, dendrograms, polymorphic bands, red rice, population dynamics

© 2001 by Universidad Católica de Valparaíso -- Chile
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