. Plant genetics . Heredity; Mendel's law; Plant breeding. l62 Plant Genetics preserve his pure strain at all costs. Shull has sug- gested the following solution of this practical problem, as indicated in fig. 37. Two desirable strains (A and B) are developed. One small plot (I) is planted entirely with A, and at some distance another small plot (II) is planted with A and B in alternating rows. Plot I is used only to perpetuate strain A in pure condition. In plot II all the A plants are detasseled. The silks of these A plants, therefore, are pollinated by B pollen only, A B A B A B. PLOT 1 p^Q
. Plant genetics . Heredity; Mendel's law; Plant breeding. l62 Plant Genetics preserve his pure strain at all costs. Shull has sug- gested the following solution of this practical problem, as indicated in fig. 37. Two desirable strains (A and B) are developed. One small plot (I) is planted entirely with A, and at some distance another small plot (II) is planted with A and B in alternating rows. Plot I is used only to perpetuate strain A in pure condition. In plot II all the A plants are detasseled. The silks of these A plants, therefore, are pollinated by B pollen only, A B A B A B. PLOT 1 p^Q^ I, Fig. 37.—Shull's scheme of planting for making practical use of hybrid vigor in corn. and the resulting grains in the A rows are all bound to be hybrids. Using these grains as seed for the crop, hybrid vigor will be obtained. At the same time both A and B are perpetuated in the pure condition, since the B rows in plot II are always self-polHnated, as there is no other pollen in that neighborhood. This is a very simple solution of the problem, without necessitating laborious hand-pollination. The investigations and conclusions of East (2) may next be considered. Shull did his work entirely with corn, but East investigated the problem in a more wholesale way. After assembling an extensive collec-. 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 resemble the original Coulter, John Merle, 1851-1928; Coulter, Merle C. (Merle Crowe), 1894-1958. Chicago : The University of Chicago Press
Size: 1581px × 1581px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherchicagotheuniversi
