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Title: Photosynthesis and chlorophyll fluorescence characteristics in relationship to changes in pigment and element composition of leaves of Platanus occidentalis L. during autumnal leaf senescence

Abstract

The loss of chlorophyll and total leaf nitrogen during autumnal senescence of leaves from the deciduous tree Platanus occidentalis L. was accompanied by a marked decline in the photosynthetic capacity of O{sub 2} evolution on a leaf area basis. When expressed on a chlorophyll basis, however, the capacity for light- and CO{sub 2}-saturated O{sub 2} evolution did not decline, but rather increased as leaf chlorophyll content decreased. The photon yield of O{sub 2} evolution in white light (400-700 nanometers) declined markedly with decreases in leaf chlorophyll content below 150 milligrams of chlorophyll per square meter on both an incident and an absorbed basis, due largely to the absorption of light by nonphotosynthetic pigments which were not degraded as rapidly as the chlorophylls. Data indicate that the efficiency for photochemical energy conversion of the remaining functional components was maintained at a high level during the natural course of autumnal senescence, and are consistent with previous studies which have characterized leaf senescence as being a controlled process. The loss of chlorophyll during senescence was also accompanied by a decline in fluorescence emanating from PSI, whereas there was little change in PSII fluorescence (measured at 77 Kelvin), presumably due to decreased reabsorption ofmore » PSII fluorescence by chlorophyll. Nitrogen was the only element examined to exhibit a decline with senescence on a dry weight basis. However, on a leaf area basis, all elements (C, Ca, K, Mg, N, P, S) declined in senescent leaves, although the contents of sulfur and calcium, which are not easily retranslocated, decreased to the smallest extent.« less

Authors:
; ;  [1];  [2]
  1. Universitaet Wuerzburg (West Germany)
  2. GSF Muenchen, Neuherberg (West Germany)
Publication Date:
OSTI Identifier:
5963506
Resource Type:
Journal Article
Journal Name:
Plant Physiology; (USA)
Additional Journal Information:
Journal Volume: 92:4; Journal ID: ISSN 0032-0889
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; CHLOROPHYLL; BIOLOGICAL EFFECTS; DECIDUOUS TREES; FLUORESCENCE; LEAVES; NITROGEN; PHOTOSYNTHESIS; VISIBLE RADIATION; CARBOXYLIC ACIDS; CHEMICAL REACTIONS; ELECTROMAGNETIC RADIATION; ELEMENTS; HETEROCYCLIC ACIDS; HETEROCYCLIC COMPOUNDS; LUMINESCENCE; NONMETALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PHYTOCHROMES; PIGMENTS; PLANTS; PORPHYRINS; PROTEINS; RADIATIONS; SYNTHESIS; TREES; 550200* - Biochemistry

Citation Formats

Adams, III, W W, Winter, K, Schreiber, U, and Schramel, P. Photosynthesis and chlorophyll fluorescence characteristics in relationship to changes in pigment and element composition of leaves of Platanus occidentalis L. during autumnal leaf senescence. United States: N. p., 1990. Web. doi:10.1104/pp.92.4.1184.
Adams, III, W W, Winter, K, Schreiber, U, & Schramel, P. Photosynthesis and chlorophyll fluorescence characteristics in relationship to changes in pigment and element composition of leaves of Platanus occidentalis L. during autumnal leaf senescence. United States. https://doi.org/10.1104/pp.92.4.1184
Adams, III, W W, Winter, K, Schreiber, U, and Schramel, P. 1990. "Photosynthesis and chlorophyll fluorescence characteristics in relationship to changes in pigment and element composition of leaves of Platanus occidentalis L. during autumnal leaf senescence". United States. https://doi.org/10.1104/pp.92.4.1184.
@article{osti_5963506,
title = {Photosynthesis and chlorophyll fluorescence characteristics in relationship to changes in pigment and element composition of leaves of Platanus occidentalis L. during autumnal leaf senescence},
author = {Adams, III, W W and Winter, K and Schreiber, U and Schramel, P},
abstractNote = {The loss of chlorophyll and total leaf nitrogen during autumnal senescence of leaves from the deciduous tree Platanus occidentalis L. was accompanied by a marked decline in the photosynthetic capacity of O{sub 2} evolution on a leaf area basis. When expressed on a chlorophyll basis, however, the capacity for light- and CO{sub 2}-saturated O{sub 2} evolution did not decline, but rather increased as leaf chlorophyll content decreased. The photon yield of O{sub 2} evolution in white light (400-700 nanometers) declined markedly with decreases in leaf chlorophyll content below 150 milligrams of chlorophyll per square meter on both an incident and an absorbed basis, due largely to the absorption of light by nonphotosynthetic pigments which were not degraded as rapidly as the chlorophylls. Data indicate that the efficiency for photochemical energy conversion of the remaining functional components was maintained at a high level during the natural course of autumnal senescence, and are consistent with previous studies which have characterized leaf senescence as being a controlled process. The loss of chlorophyll during senescence was also accompanied by a decline in fluorescence emanating from PSI, whereas there was little change in PSII fluorescence (measured at 77 Kelvin), presumably due to decreased reabsorption of PSII fluorescence by chlorophyll. Nitrogen was the only element examined to exhibit a decline with senescence on a dry weight basis. However, on a leaf area basis, all elements (C, Ca, K, Mg, N, P, S) declined in senescent leaves, although the contents of sulfur and calcium, which are not easily retranslocated, decreased to the smallest extent.},
doi = {10.1104/pp.92.4.1184},
url = {https://www.osti.gov/biblio/5963506}, journal = {Plant Physiology; (USA)},
issn = {0032-0889},
number = ,
volume = 92:4,
place = {United States},
year = {Sun Apr 01 00:00:00 EST 1990},
month = {Sun Apr 01 00:00:00 EST 1990}
}