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.

Seasonal Pattern of Photosynthesis in Individual Grass Leaves and Other Plant Parts in Arctic Alaska with a Portable 14CO2 System

Larry L. Tieszen and Douglas A. Johnson
Botanical Gazette
Vol. 136, No. 1 (Mar., 1975), pp. 99-105
Stable URL: http://www.jstor.org/stable/2473798
Page Count: 7
  • 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.
Seasonal Pattern of Photosynthesis in Individual Grass Leaves and Other Plant Parts in Arctic Alaska with a Portable 14CO2 System
Preview not available

Abstract

A portable system for photosynthesis determinations has been used under field conditions in the Arctic at Barrow, Alaska. Maximum photosynthetic rates were greater than 18 mg CO2·dm-2·h$^{-1}$ in a number of species and were comparable with those of other C3 plants in arctic and temperate areas. Rates were closely coupled to irradiance Plant components other than expanded blades were active in CO2 uptake. In Dupontia fischeri, leaf sheaths and culms possessed rates greater than 50% those of mature leaves. The leaves of D. fischeri and Alopecurus alpinus are produced sequentially and possess distinct seasonal patterns which appear related to leaf growth, maturation, and senescence stages. Thus, even in the short growing season of the Arctic, these grasses possess sequential patterns of leaf development and photosynthesis rather than a synchronized early season burst of leaf production.

Page Thumbnails

  • Thumbnail: Page 
99
    99
  • Thumbnail: Page 
100
    100
  • Thumbnail: Page 
101
    101
  • Thumbnail: Page 
102
    102
  • Thumbnail: Page 
103
    103
  • Thumbnail: Page 
104
    104
  • Thumbnail: Page 
105
    105