Incorporation of C-Photosynthate into Protein during Leaf Development in Young Populus Plants
1Department of Forestry, Iowa State University, Ames, Iowa 50010.
Abstract:
Gas exchange and protein metabolism were studied in expanding, mature, and near-senescent leaves of young clonal Populus x euramericana cv. Wisconsin-5 plants. Dark respiration, CO(2) evolution in the light, and CO(2) compensation concentrations were highest in unexpanded leaves but declined markedly as leaves matured and aged. Net photosynthesis was highest in nearly mature leaves. Fresh weight continued to increase after leaf expansion was complete, whereas soluble protein levels declined. Changes in the distribution of photosynthetically incorporated (14)C indicated that a high level of protein synthesis and rapid formation of structural components occurred only in expanding leaves. Protein turnover was slight in expanding leaves but was substantial after leaves were mature. Expanding leaves synthesized predominantly fraction I protein (ribulose diphosphate carboxylase). However, formation of this protein from photosynthate was slight once leaves matured.
More Related Videos
08:04Poplar Adventitious Roots Induced by Stem Canker Pathogens: An Experimental System for Studying Roots Biology and Light Response-Related Processes
Published on: October 11, 2024
04:3213C6-Glucose Labeling Associated with LC-MS: Identification of Plant Primary Organs in Secondary Metabolite Synthesis
Published on: March 22, 2024
Related Concept Videos
C4 Pathway and CAM
C4 Pathway
The C4 pathway is used by plants such as...
The Calvin Benson Cycle
What is Photosynthesis?
What is Photosynthesis?
Types of Organisms Based on their Modes of Nutrition
Broadly, there are two main categories of organisms based on their modes of nutrition — autotrophs and heterotrophs. An...
Photosystem II
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
The Anatomy of Chloroplasts
Structure of Chloroplasts
A...
