Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

The Seedling Anatomy of Ipomoea batatas

Herman E. Hayward
Botanical Gazette
Vol. 93, No. 4 (Jun., 1932), pp. 400-420
Stable URL: http://www.jstor.org/stable/2471448
Page Count: 23
  • Read Online (Free)
  • Download ($19.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Seedling Anatomy of Ipomoea batatas
Preview not available

Abstract

1. The structure of the seed and the development of the seedling of I pomoea batatas are described. 2. The primary root is tetrarch, and in the growing point three histogens may be observed. The plerome and periblem give rise to stele and cortex respectively, while the calyptrogen produces the root cap and by a final periclinal division forms the epidermis. 3. In the development of the root, primary phloem is first differentiated and the enlargement of a single row of cells produces four primary latex vessels. 4. Differentiation of lateral roots occurs early in ontogeny before the complete maturation of the protoxylem elements. 5. In transition the primary xylem strands in the cotyledonary plane constitute the xylem of the midvein of the cotyledonary trace; while the intercotyledonary strands, by separation, form the xylem of the lateral bundles of the cotyledonary trace. 6. The internal phloem arises later in ontogeny than the external and is not regularly connected with the external phloem by anastomoses. Some interconnection between the outer and inner phloem was observed in the petiolar region of the cotyledons. 7. Infrequent cross-connection of inner and outer phloem by differentiation of the intervening fundamental parenchyma cells was observed in the hypocotyl. 8. A possible correlation between the degree of development of internal phloem and increasing photosynthetic activity is suggested. 9. The development of the epicotyl and foliage leaves is described.

Page Thumbnails

  • Thumbnail: Page 
400
    400
  • Thumbnail: Page 
401
    401
  • Thumbnail: Page 
402
    402
  • Thumbnail: Page 
403
    403
  • Thumbnail: Page 
404
    404
  • Thumbnail: Page 
405
    405
  • Thumbnail: Page 
406
    406
  • Thumbnail: Page 
407
    407
  • Thumbnail: Page 
408
    408
  • Thumbnail: Page 
409
    409
  • Thumbnail: Page 
410
    410
  • Thumbnail: Page 
411
    411
  • Thumbnail: Page 
412
    412
  • Thumbnail: Page 
413
    413
  • Thumbnail: Page 
414
    414
  • Thumbnail: Page 
415
    415
  • Thumbnail: Page 
416
    416
  • Thumbnail: Page 
417
    417
  • Thumbnail: Page 
418
    418
  • Thumbnail: Page 
419
    419
  • Thumbnail: Page 
420
    420
  • Thumbnail: Page 
[unnumbered]
    [unnumbered]
  • Thumbnail: Page 
[unnumbered]
    [unnumbered]