. Cyclopedia of farm crops. Farm produce; Agriculture. Fig. 78. Inaividiiality in cotton bolls. Smooth seeds above iiud fuzzy ones below, from four bolls of one hybrid plant. produce variations in order to get new types as the foundations for improvement. On the other hand, when such a variation from or improvement on the normal type is secured, he then reverses the pro- and tries to establish heredity and reduce the amount of variation, so that the aphorism, "like begets like," will hold true. In pedigree or grade breeding, and in breeding to produce new varieties, the importa
. Cyclopedia of farm crops. Farm produce; Agriculture. Fig. 78. Inaividiiality in cotton bolls. Smooth seeds above iiud fuzzy ones below, from four bolls of one hybrid plant. produce variations in order to get new types as the foundations for improvement. On the other hand, when such a variation from or improvement on the normal type is secured, he then reverses the pro- and tries to establish heredity and reduce the amount of variation, so that the aphorism, "like begets like," will hold true. In pedigree or grade breeding, and in breeding to produce new varieties, the importance of hereditary strength, prepotency or transmitting power, cannot be overestimated, as it is only by rendering this power very great that any new form can be brought to what is called a fi,\ed type. Unity of individual.—The unity of the individual is also an important factor in plant-breeding. If, for instance, the breeder is attempting to produce a seedless fruit, it is important that he the tendency to seedlessness in the entire individual. It would not be the correct policy for a breeder to select simply a single fruit which might acciden- tally be nearly seedless. He should examine a large number of fruits of different individual plants, and find a plant on which he can discover a general tendency toward seedlessness showing in all of the fruits produced. By selecting seed from such indi- viduals, he may be able to find in time one such individual that would transmit to its progeny this tendency to produce few seeds. While this is certainly generally true, there are some instances in which divisions of the individual are important. As an illustration may be mentioned the case of hybrids between a smooth- and a fuzzy- seeded cotton : when one is breeding to produce a smooth, black seed, it may be desirable to select a part of an individual. In this the writer has found that very frequently a cotton hybrid of the above parentage will produce bolls that va
Size: 1856px × 1347px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectagriculture, bookyear
