Natural Crossings in Oats at Akron, Colorado¹

On some relationships between Avena sativa and A. fatua (Gramineae) as studied from Canadian material

“…Evidence of natural crossing was brought out by many authorities including Rimpau (1891); Jamieson (1897, 1898); Zade (1912); Livermore (1 9 12); Von Tschermak (1 9 18) ; Heribert-Nilsson (1919); CrCpin (1921); Carne and Limbourn (1924); Stanton and Coffman (1924); CrCpin (1925); Schribaux (1925); Griffee and Hayes (1925); Garber and Hoover (1929); Coffman and Wiebe (1930); Wexelsen (1931); Harrington (1932); Hoover and Snyder (1932); Derick (1933); Jones (1933); Aamodt et al (1934); Taborda de Morais (1937); Morey (1949); Thurston (1957); and Imam and Allard (1965 I have shown earlier that phenotypes matching artificially produced F , hybrids occur spontaneously in fields. Some of these putative hybrids might have resulted by selfing or from crossing in later generations, Fz, F,, .…”

Natural Crossing in Oats1

“…Results of recent experiments by Stanton and Coffman (2) give accurate information as to the amount of crossing which occurred in 1922 between varieties of oats grown in adjacent row plats at Akron, Colorado. They grew black-grained and white-grained varieties in alternate rows and made a determination of the percentage of natural crossing where white-grained plants were the mother variety and where they were naturally pollinated with pollen from black varieties.…”