Phenotypic diversity in wild barley (<Emphasis Type="Italic">Hordeum vulgare</Emphasis> L. ssp. <Emphasis Type="Italic">spontaneum</Emphasis> (C. Koch) Thell.) accessions collected in Jordan |
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Authors: | Y Shakhatreh N Haddad M Alrababah S Grando S Ceccarelli |
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Institution: | (1) National Center for Agricultural Research and Extension (NCARE), Amman, Jordan;(2) Faculty of Agriculture, University of Jordan (UoJ), Amman, Jordan;(3) Jordan University of Science and Technology (JUST), Irbid, Jordan;(4) International Center for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syria; |
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Abstract: | Wild barley, Hordeum vulgare L. ssp. spontaneum (C. Koch) Thell., is the progenitor of cultivated barley. Almost unanimously the center of diversity is considered to be
in the Fertile Crescent of the Near East, where wild barley grows under a wide range of environmental and climatic conditions.
Jordanian wild barley is expected to harbor genes useful for the improvement of cultivated barley, particularly those associated
with tolerance to drought. This study evaluated 103 wild barley accessions collected from different areas of Jordan along
with 29 cultivated barley genotypes for several morphological and agronomical traits. The Hordeum vulgare ssp. spontaneum C. Koch accessions were grouped into six populations according to the longitude, latitude, altitude, and rainfall zone of
the collection site, and the cultivated barley in one population. The evaluation was conducted during the 2004–2005 growing
season under field conditions in three locations in Jordan; namely, Khanasri, Ramtha, and Maru with 123.0, 222.9, and 429.2 mm
annual rainfall, respectively. We used an unreplicated design with two systematic checks (the cultivars Rum and Mu’ta) each
repeated 15 times. The results showed the existence of high variability among the Hordeum vulgare ssp. spontaneum C. Koch accessions for most of the traits, especially for plant height, tiller number, days to heading, days to anthesis,
peduncle length, and peduncle extrusion. Plant height, earliness, peduncle length, and peduncle extrusion were found to be
adaptive traits under drought conditions and several superior genotypes for each trait were identified. Genetic variation
within population was much higher than between populations. Clustering of populations was according to their ecological geographical
pattern. |
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