Winter hardiness in orchardgrass (Dactylis glomerata L.) populations introduced from the former USSR
1996
Nakayama, S. (Hokkaido National Agricultural Experiment Station, Sapporo (Japan)) | Abe, J.
Five cultivars and 23 indigenous wild populations of orchardgrass from the former USSR wee evaluated for freezing tolerance, resistance to snow mold caused by Typhula ishikariensis, and other traits related to winter hardiness under field conditions in Sapporo. Three cultivars from Hokkaido (Hokuto, Okamidori, and Wasemidori) were included for comparison. In general, accessions from the former USSR were more tolerant to freezing and snow mold than those from Hokkaido. However, winter hardiness, as measured by the vigor of the plant just after snow melt, was better in cultivars from Hokkaido than in most accessions from the former USSR. Winter hardiness was positively associated with earliness in heading and tolerance to stem rust caused by Puccinia graminis in the preceding year, and negatively associated with winter dormancy (expressed as vigor of regrowth in November). Dedinovskaja 4 was, however, an exception as it was most winter hardy genotype despite long dormancy and delayed heading. Gruzinskaja from Georgia was more resistant to stem rust and grew more vigorously in late autumn than the cultivars from Hokkaido. Two extra early maturing accession (No.38091 from Tajikistan, and Leningradskja from Leningrad) showed high tolerance to both freezing and snow mold
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