Compensation point and isotopic characteristics of c(3)/c(4) intermediates and hybrids in panicum
L da S Sternberg1, M J Deniro, M E Sloan
1Department of Earth and Space Sciences and Archeology Program, University of California, Los Angeles, California 90024.
Abstract:
Leaf CO(2) compensation points and stable hydrogen, oxygen and carbon isotope ratios were determined for Panicum species including C(3)/C(4) intermediate photosynthesis plants, hybrids between C(3)/C(4) intermediates and C(3) plants, C(3) and C(4) plants in the Panicum genus as well as several other C(3) and C(4) plants. C(3) plants had the highest compensation points, followed by hybrids, C(3)/C(4) intermediates, and C(4) plants. delta(13)C values of cellulose nitrate and saponifiable lipids from C(4) plants were about 10 per thousand higher than those observed for cellulose nitrate and saponifiable lipids of C(3)/C(4) intermediates, hybrids, and C(3) plants. Oxygen isotope ratios of cellulose as well as those of leaf water were similar for all plants. There was substantial variability in the deltaD values of cellulose nitrate among the plants studied. In contrast, such variability was not observed in deltaD values of water distilled from the leaves, nor in the deltaD values of the saponifiable lipids. Variability in deltaD values of cellulose nitrate from C(3)/C(4) intermediates, hybrids, C(3), and C(4) plants is due to fractionations occurring during biochemical reactions specific to leaf carbohydrate metabolism.
More Related Videos
08:12Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids (BPCA)
Published on: May 16, 2016
12:01A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica
Published on: February 20, 2012
Related Concept Videos
C4 Pathway and CAM
C4 Pathway
The C4 pathway is used by plants such as...
Mass Spectrometry: Isotope Effect
π Molecular Orbitals of 1,3-Butadiene
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
Carbon-13 (¹³C) NMR: Overview
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
