. Practical text-book of plant physiology. Plant physiology. CHEMOTROPIC MOVEMENTS OF POLLEN TUBES 61 and 4 or 5 g. cane sugar to 50 cc. distilled water. Warm until a homogeneous solution is obtained. Place a drop of this solution on a glass slip and when cold add a number of pollen cells of Narcissus, Fritillaria, or Lathyrus. Cover with a thin circle of glass and set in a moist chamber kept as near 180 C. as possible. Examine eight or ten hours later, and also the next day. Note the direction taken by the pollen tubes. All seem to be pointed. The lines a to b represent the edge of In a, poll
. Practical text-book of plant physiology. Plant physiology. CHEMOTROPIC MOVEMENTS OF POLLEN TUBES 61 and 4 or 5 g. cane sugar to 50 cc. distilled water. Warm until a homogeneous solution is obtained. Place a drop of this solution on a glass slip and when cold add a number of pollen cells of Narcissus, Fritillaria, or Lathyrus. Cover with a thin circle of glass and set in a moist chamber kept as near 180 C. as possible. Examine eight or ten hours later, and also the next day. Note the direction taken by the pollen tubes. All seem to be pointed. The lines a to b represent the edge of In a, pollen of Narcissus tazetta in a Fig. 26. Chemotropism of pollen tubes. a cover-glass under which are pollen tubes, seven per-cent. solution of sugar is seen to be negatively chemotropic to the air at the edge of the cover-glass. In b negative chemotropism of pollen tubes of Cephalan- thera fallens in seven per-cent. sugar solution is shown, about 20 hours after begin- ning of experiment, c, stigma of Narcissus tazetta with pollen tubes impinging on its surface. After Molisch. toward" the center of the preparation, or away from contact with the air. Make a second preparation and treat it as the first but seal the edges of the cover with vaseline. Compare the behavior. 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 MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1901
