. Breeding crop plants. Plant breeding. 18 liREEDINd CliOr PLAXTS pair being obtained from the male parent and the other from the female parent. At the formation of the sexual cells, or at reduc- tion division, one member of each pair of chromosomes passes to each daughter cell thus reducing the chromosome number to half that in the body cells. Following this reduction division there is an equating division whereby each chromosome is qualitatively. Fig. 4.—Auther and pollen of the lily. A, Mature anther, showing the four locules, or chambers, containing pollen grains: the anther opens lengthwi
. Breeding crop plants. Plant breeding. 18 liREEDINd CliOr PLAXTS pair being obtained from the male parent and the other from the female parent. At the formation of the sexual cells, or at reduc- tion division, one member of each pair of chromosomes passes to each daughter cell thus reducing the chromosome number to half that in the body cells. Following this reduction division there is an equating division whereby each chromosome is qualitatively. Fig. 4.—Auther and pollen of the lily. A, Mature anther, showing the four locules, or chambers, containing pollen grains: the anther opens lengthwise on both sides along the lines of cells shown at jr; B, stages in the formation of pollen grains in a group of four (tetrad) within the pollen mother cell; C, mature pollen grain with early stages in the development of the male gametophyte; t, tube nuclexis; a, generative nucleus. (After Bergen and Davin.) equally divided. This results in the formation of the male or female sexual cells or gametes as they are called (see Fig. 3). The male sexual cells are produced in the anthers and are carried in the pollen grains. A mature pollen grain contains two nuclei, a tube nucleus and a generative nucleus (see Fig. 4). After the pollen grain falls on the pistil the tube cell. 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
