Abstract
IN many perennial grasses of temperate regions, exposure to low temperature has proved to be a necessary condition for the attainment of the reproductive phase. After vernalization, flowering may occur directly in response to long-day conditions in some grasses1, or after initial treatment with short days followed by transfer to long photoperiods in others2,3. The precise requirements of timothy grass have so far remained unknown, except that it flowers in long days4 and that spring sowings may lead to ear formation in the same year2. In view of the agronomic importance of the plant, some clarification appeared desirable.
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