. Breeding crop plants. Plant breeding. 224 BREEDING CROI' I'LANTS 1. The heterozygous condition of most varieties. 2. The difficulties of obtaining crossed seed. The hetcrozj'gous condition need not be further emphasized. Conditions are much the same as in the fruit crops. The Difficulties of Obtaining Crossed Seed.—The technic of making a cross is very simple. According to East (1908a), "The flowers close slightly about dusk and open in the morning between fiye and six o'clock. The pollen appears to be in the best condition for use on the second day of ; Stuart (1915) coll
. Breeding crop plants. Plant breeding. 224 BREEDING CROI' I'LANTS 1. The heterozygous condition of most varieties. 2. The difficulties of obtaining crossed seed. The hetcrozj'gous condition need not be further emphasized. Conditions are much the same as in the fruit crops. The Difficulties of Obtaining Crossed Seed.—The technic of making a cross is very simple. According to East (1908a), "The flowers close slightly about dusk and open in the morning between fiye and six o'clock. The pollen appears to be in the best condition for use on the second day of ; Stuart (1915) collects flowers to be used as the male parent in small sacks. After the pistil is removed from these flowers the anthers are tapped sharply with a pair of forceps, the pollen is collected. Fig. 5-1.— Iliiiasculiitcd and uiK'masculated jjotato blossoms. (After Shiart.) on the thumb nail and then applied to the pistil of the emascu- lated flower. The flowers are receptive two to four days after emasculation. East (1908a) stated the belief that the potato is usually self-fertiHzed. He also observed the fact that insects were seldom seen to visit the flower. Salaman (1910-11) believes it unnecessary to cover the flower before or after pollination. Stuart, however, used 1-lb. l)ags and found that if a certain amount of foliage was included in the bag the use of bags did not cause a lowering of the number of seeds set. An average of between one and two hundred seeds was obtained from each suc- cessful cross by Stuart. The chief difficulty is that many varieties do not bloom very. 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 Hayes, Herbert Kendall, b. 1884; Garber, Ralph John, b. 1890. New York [etc. ] : McGraw-Hill book company, inc.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantbr, bookyear1921
