About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in CS

  1. Vol. 11 No. 1, p. 55-58
     
    Received: July 7, 1970
    Published: Jan, 1971


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2135/cropsci1971.0011183X001100010018x

Photosynthesis of Plant Parts of Alfalfa Canopies1

  1. D. D. Wolf and
  2. R. E. Blaser2

Abstract

Abstract

Radioactive carbon from CO2 assimilated by upper leaves of alfalfa, Medicago sativa L., was not detected later in lower leaves. This suggests that the old leaves in dense canopies (low light intensity) were not parasitic. Net carbon exchange (NCE) and specific leaf weight (SLW) were highest for upper leaves and lowest for bottom leaves. NCE of petioles and stipules contributed 0.6 and 0.9% of total NCE of an alfalfa canopy. The upper steur under normal light conditions was near light compensation, while 8% of the photosynthate from leaves appeared to be respired by the lower stem tissue. The data suggest that models for predicting plant growth may need to include respiration from stems of plants in late growth stages. The data do not support the concept that respiration is a linear function of increased leaf area index.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .