Summary
The reaction of spikes and grains of barley to phenol was investigated using 8,849 cultivated and 349 wild accessions collected from the world. The pericarp and hull of the grain were stained dark brown by a 1% phenol solution and the reaction of awn was sharpest. Phenol reaction was controlled by a dominant gene, named Phr (phenol reaction) which was located on chromosome 2. All the wild strains of various Hordeum species showed a positive reaction to phenol indicating it was the prototype of the trait. Only 51 accessions of cultivated barley showed negative reaction to phenol. They were distributed along the so-called ‘Silk-road’ and the type of variety was limited suggesting that it was a rather new mutation which occurred in the Middle East. Synteny of the chromosome region involving the phenol reaction gene in some gramineous plants was discussed.
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Takeda, K., Lin Chang, C. Inheritance and geographical distribution of phenol reaction-less varieties of barley. Euphytica 90, 217–221 (1996). https://doi.org/10.1007/BF00023861
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DOI: https://doi.org/10.1007/BF00023861