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Experiments in increasing the yield of spring wheat. I, Crosses with brown Schlanstedter spring wheat and a description of Svalof Progress spring wheat

Experiments in increasing the yield of spring wheat. I, Crosses with brown Schlanstedter spring wheat and a description of Svalof Progress spring wheat

Sveriges Utsadesforen Tidskr 53(2): 51-66

In the introduction mention is made of the spring wheat improvement at the Swedish Seed Assoc. at Svalof having first been carried on as line selections from old market varieties. This resulted in Svalof Kolben (from Heine's Kolben) and Svalof Varparl (from Emma). Both had too low a yield to be of practical value. Svalof Kolben, however, proved to be particularly valuable for the continued breeding work owing to its outstanding baking quality, which is practically identical with that of Fife spring wheat from U. S. A. Line selections from old Swedish native vars. were made by Hj. Nilsson and H. Nilsson-Ehle, but from these no vars. of practical importance could be obtained. Only after methodical cross-breeding work, which was begun about 1900, was definite progress made: Extra-Kolben I and Varsquarehead (raised by Nilsson-Ehle 1917); Extra-Kolben II, Diamant I, Fylgia and Diamant II (raised by Akerman 1925, 1928, 1934 and 1937. An account is then given of crosses with Roter Schlanstedter spring wheat (Bordeaux wheat) and in that connection of interesting segregations of winter wheat forms from F2 out of the cross Roter Schlanstedter X Svalof Varparl spring wheat (and Svalof Kolben) in the ratio of 1 winter form:15 spring forms. Each of the 2 spring wheat vars. must consequently possess a different "spring wheat factor"; in Roter Schlanstedter this has been called SsSs and in Svalof Kolben SkSk. The factor Ss has also been established for Noe spring wheat (very closely related to the French Rouge de Bordeaux). By crossing analyses lines from certain Swedish and Norwegian native spring wheats and, further, Rubin, Diamant I, Aurore and Marquis spring wheat have proved to be 2 factorial; Marquis may possibly contain 3 spring wheat factors. It has been statistically confirmed that 3 such factors can exist by F2 analysis of the cross Master (from Canada) and Kron-vete. It is of great interest that all the bi- and trifactorial spring wheats also ripen particularly early. The work concludes with an account of the raising of Svalof Progress spring wheat, a new var. intended for South-Swedish cultivation conditions. It has been bred from the var. A 23/8 X Extra-Kolben II. A 23/8 has been grown from a cross between Svalof Kolben X Roter Schlanstedter and was in itself high-yielding, early and straw-stiff, but had too low a baking quality to be put into the market. Its grain yield is 5-10% higher than that of Extra-Kolben II.

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