. The botany of crop plants; a text and reference book. Botany, Economic. POMACES 373 the other varieties the pollen of which is capable of fertilizing it. It is no doubt true that the failure of many varieties to set fruit is due, in part, to self-sterility. Effects of Strange Pollen.^—The secondary effects of for- eign pollen on the mature fruit have received considerable at- tention. It is claimed by many that the pollen from one va- riety when placed on the stigma of another, immediately. •5 sNiej rim of receptacle Fig. 157.—Apple (Malus sylvestris). Median longitudinal section of flower.
. The botany of crop plants; a text and reference book. Botany, Economic. POMACES 373 the other varieties the pollen of which is capable of fertilizing it. It is no doubt true that the failure of many varieties to set fruit is due, in part, to self-sterility. Effects of Strange Pollen.^—The secondary effects of for- eign pollen on the mature fruit have received considerable at- tention. It is claimed by many that the pollen from one va- riety when placed on the stigma of another, immediately. •5 sNiej rim of receptacle Fig. 157.—Apple (Malus sylvestris). Median longitudinal section of flower. impresses its characteristics upon the fruit. It is difficult to understand how foreign pollen could have any considerable effect of this kind. The flesh of the apple is receptacle for the most part. The sperm nuclei of the pollen, of course, do not come into contact with the nuclei of the receptacle cells. It is altogether possible, however, that uniformity of crop, percent- age of set, and size of fruit are immediately affected by strange 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 Robbins, Wilfred William, 1884-1952. Philadelphia, P. Blakiston's Son & Co
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
