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CROP BREEDING, GENETICS & CYTOLOGY

Moving beyond the Winter Hardiness Plateau in U.S. Oat Germplasm

^a USDA and North Carolina State Univ., Dep. of Crop Science, 840 Method Rd., Unit 3, Raleigh, NC 27695-7629
^b North Carolina State Univ., Dep. of Crop Science, 840 Method Rd., Unit 3, Raleigh, NC 27695-7629

^* Corresponding author (dpl{at}unity.ncsu.edu)

Progress has been slow in the development of winter-hardy oat (Avena sativa L.) cultivars. No cultivar released in the last 40 yr has better freezing tolerance than the cultivar Norline, which was released in 1960. However, in an analysis of 65 yr of field testing, Norline was not more winter hardy than ‘Wintok’, which was released in 1940. An analysis of individual location–year combinations of Wintok and Norline suggested that progeny from a cross of these two cultivars might contain germplasm that was transgressive for freezing tolerance. The objective of this research was to use mass selection in controlled environment freeze tests on successive segregating generations of the cross between Wintok and Norline to identify inbred progenies with significantly greater winter hardiness than either parent. Following three generations of seed increase and three generations of selection for freezing tolerance in controlled freeze tests, several F₇ genotypes were identified with greater freezing tolerance than both parents. In the F₉ generation, two of the lines exhibited a higher level of freezing tolerance than either parent, and both were slightly more freezing tolerant than the moderately winter-hardy barley, Hordeum vulgare ‘Trebi’.

Abbreviations: UOWHN, Uniform Oat Winter Hardiness Nursery

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THIS ISSUE IN CROP SCIENCE

Crop Science 2004 44: 1889-1892. [Full Text]