. Breeding crop plants. Plant breeding. 196 BREEDING CROP PLANTS corn and gave per cent, higher protein content. These particular strains, 1 and 4, were not examined during the seedhng stage and consequently it was not then known that strain 1 was heterozygous for the white seedling chlorophyll abnormality which Lindstrom has designated by the factor w. In the second generation grown from self-fertilized ears of A, B, and K, ap- proximately one-fourth of the seedlings were pure white. Lind- strom has shown that plants heterozygous for the chlorophyll factors Wtv are slightly less vigorous
. Breeding crop plants. Plant breeding. 196 BREEDING CROP PLANTS corn and gave per cent, higher protein content. These particular strains, 1 and 4, were not examined during the seedhng stage and consequently it was not then known that strain 1 was heterozygous for the white seedling chlorophyll abnormality which Lindstrom has designated by the factor w. In the second generation grown from self-fertilized ears of A, B, and K, ap- proximately one-fourth of the seedlings were pure white. Lind- strom has shown that plants heterozygous for the chlorophyll factors Wtv are slightly less vigorous than homozygous green forms. Those facts lead one to expect that high protein races with good yielding ability may be produced. On the other hand,. Fig. 44.—Two hi^h j>rotein .strains of Minn. No. 1 'hicli have been self-fertilized for five years and fi fiem in the renter. The Fi yieldefl slightly more tl nalvzed 2\) oer cent, hicher in nrotein content. at left and right respectively ^, first generation cross between them in the center. The Fi yieldefl slightly more than normal Minn. No. 13 and analyzed 2^2 Pcr cent, higher in protein content. maximum yield of grain and high protein content probably can not be obtained in the same variety. CORN IMPROVEMENT BY THE TRAINED PLANT BREEDER A unif(;rm technic has been developed for the small-grain breeder. With corn, however, the correct method of breeding is even j-et somewhat problematical. Investigations have helped to clarif}'' our ideas regarding the value of different methods of wcik. For the farmer the results obtained have tended to simplify pre- vious ear-to-row methods. For the technical breeder, how- ever, the application of Mendelian principles has resulted in several plans, some of which appear rather complex. Their. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemb
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantbr, bookyear1921
