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File:Pecan rosette - its histology, cytology, and relation to other chlorotic diseases (1038) (14773890501).jpg

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Identifier: pecanrosetteitsh1038rand (find matches)
Title: Pecan rosette : its histology, cytology, and relation to other chlorotic diseases
Year: 1922 (1920s)
Authors: Rand, Frederick Vernon, 1883-1961
Subjects: Pecan rosette Pecan
Publisher: Washington, D.C. : U.S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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Vein Islets of Unsectioned and Unstained Pecan Leaves. A, and C to E are from photomicrographs of leaves preserved in alcohol. B is from a photomicro-graph of a dry herbarium specimen. All at the same magnification. X about 60. The whitespots are calcium-oxalate crystal aggregates. A to D.—Yellow spots of rosetted leaflets in thesecondary stage, showing the distortion in shape and the variation in size of the vein islets. E —Similar view of vein islets in a normal leaflet, showing approximately uniform size and regulararrangement. Photomicrographs by the writer. Bui. 1038, U. S. Dept. of Agriculture. PLATE XI
Text Appearing After Image:
Vertical Sections of Healthy and Diseased Pecan Leaflets,Frotscher Variety. Collected on August 2.> and 26, 1919, at Thomasville, Ga. All figures at the same magnification.X 540. A.—Healthy pecan leaflet collected at sundown, killed in Carnoys fluid, and stainedwith iodin to show the presence of starch in the palisade and spongy cells. B.—Healthypecan leaflet collected in the morning, killed in Carnoys fluid, and stained with iodin to showthe absence of starch. C and D.—Pecan leaflets aborted with rosette, collected and treatedin the same way, respectively, as in the preceding two normal leaflets. Chloroplasts in bothnight (C) and morning (D) specimens were gorged with starch, and apparently no trans-location had taken place during the night. Note also the enlargement of the cells in the dis-eased material. Photomicrographs by the writer. Bui. 1038, U. S. Dept. of Agriculture Plate XI

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https://www.flickr.com/photos/internetarchivebookimages/14773890501/

Author Rand, Frederick Vernon, 1883-1961
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Volume
InfoField
1038
Flickr tags
InfoField
  • bookid:pecanrosetteitsh1038rand
  • bookyear:1922
  • bookdecade:1920
  • bookcentury:1900
  • bookauthor:Rand__Frederick_Vernon__1883_1961
  • booksubject:Pecan_rosette
  • booksubject:Pecan
  • bookpublisher:Washington__D_C____U_S__Dept__of_Agriculture
  • bookcontributor:U_S__Department_of_Agriculture__National_Agricultural_Library
  • booksponsor:U_S__Department_of_Agriculture__National_Agricultural_Library
  • bookleafnumber:39
  • bookcollection:usda-bulletin
  • bookcollection:usdanationalagriculturallibrary
  • bookcollection:fedlink
  • bookcollection:americana
Flickr posted date
InfoField
29 July 2014

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