Growth characteristics of winter triticale in Hokkaido collected from various countries, 2: Freezing tolerance and physiological snow tolerance of promising varieties
2004
Yu, H. (Rakuno Gakuen Univ., Ebetsu, Hokkaido (Japan)) | Yoshihira, T. | Nakatsuka, K. | Kosaka, S.
Summary In order to determine the degrees of freezing tolerance and physiological snow tolerance of triticale varieties with relatively good yields and winter hardiness (2 varieties bred in the United States, 3 varieties bred in Russia and 2 varieties bred in Poland), the lethal dose temperature (LT sub(50) value) and related characteristics of those triticale varieties under the snow cover condition were compared with those of wheat and rye varieties that have good winter hardiness. The degrees of freezing tolerance in the early winter of the two triticale varieties bred in the United States were similar or even superior to those of the wheat varieties, but the freezing tolerance of other triticale varieties was inferior to that of wheat. These differences between triticale varieties were determined on the basis of mono-and di-saccharides content and water content. The degrees of physiological snow tolerance of all of the triticale varieties were less than those of the wheat and rye varieties, though the US triticale variety Bob and the Polish variety Eldorado, both of which have a large chilling requirement, showed relatively good physiological snow tolerance, as measured by the rise in LT sub(50) and decrease in fructan content. The triticale varieties Bob and Eldorado were considered to be appropriate breeding materials for improving in winter hardiness of triticale.
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