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Aegilops ovata (17)
Ae. ovata was found in the roadside five miles west of
Willits, California. It grows at the edge of the site and the
plants are smaller in size than the surrounding other
grass species. This is because Ae. ovata is less competitive
than tall grass species. The population size was not so large. It is
considered that Ae. ovata has also spread as a contaminant of
cattle feed.
The Ae. cylindrica accessions described in this report will be
added to the list given in Watanabe (1997), and will be used to
assess genetic differentiation in this adventitious Aegilops
species. Ae. triuncialis has a diphyletic origin from the
reciprocal hybrids between Ae. caudata and Ae.
umbellulata. (Ogihara and Tsunewaki 1982). It has three
chloroplast genotypes (Murai and Tsunewaki 1986). However, it is not
clear which cytoplasm type is predominant in the specific ecological
niches. Unfortunately, there is no historical record on the
introduction of Ae. triuncialis to California. Since the
Spanish people first colonized California, one approach to trace back
the route of introduction would be comparison of allelic and
genotypic compositions between Spanish and Californian
populations.
Acknowledgments
We are grateful to Dr. J.G. Waines, University of California,
Riverside and Dr. L. Morrison, Oregon State University, Corvallis for
their kind advises to collect the spikes of Aegilops species.
We are also grateful to Dr. G. Belay for his helpful comments on the
manuscript. Our collection was partially supported by the grant to NW
from Ministry of Education, Science and Culture, Japan (No.
O9NP0901).
References
Murai K and Tsunewaki K (1986) Molecular basis of the genetic
diversity among cytoplasms of Triticum and Aegilops
species. IV. CtDNA variation in Ae. triuncialis. Heredity 57:
335-339.
Ogihara Y and Tsunewaki K (1982) Molecular basis of the genetic
diversity of the chloroplast genome and its lineage revealed by the
restriction pattern of ctDNAs. Jpn J Genet 57: 371-396.
Seefeldt SS, Zemetra R, Young FL and Jones SS (1998) Production of
herbicide-resistant jointed goatgrass (Aegilops cylindrica) x
wheat (Triticum aestivum) hybrids in the field by natural
hybridization. Weed Sci. 46: 632-634.
van Slageren MW (1994) Wild wheat: a monograph of Aegilops
L. and Ampyropyrum (Jaob. & Spach) Eig (Poaceae).
Wageningen Agric Univ and Int Center for Agric Res Dry Area.
1-513.
Watanabe N (1997) Assembly of North American accessions of
Aegilops cylindrica. Wheat Inf Serv 84: 60-63.
Zemetra R, Hansen J and Mallory-Smith CA (1998) Potential for gene
transfer between wheat (Triticum aestivum) and jointed
goatgrass (Aegilops cylindrica). Weed Sci. 46: 313-317.
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