deltaC Values in Maize Leaf Correlate with Phosphoenolpyruvate Carboxylase Levels
H Sasakawa1, B Sugiharto, M H O'leary
1Department of Agricultural Chemistry, School of Agriculture, Chikusa, Nagoya 464, Japan.
Abstract:
Values of delta(13)C and levels of phosphoenolpyruvate carboxylase and ribulose 1,5-bisphosphate carboxylase/oxygenase were analyzed in segments from the fourth leaf of young maize (Zea mays L.) plants. The delta(13)C values became significantly more negative from the base to the tip of the leaves. Phosphoenolpyruvate carboxylase levels and ribulose bisphosphate carboxylase levels both increased from the base to the tip. The principal effect of phosphoenolpyruvate carboxylase levels or delta(13)C should arise through its effect on the carboxylation/diffusion balance in the mesophyll. In this case, delta(13)C values should become more negative as phosphoenolpyruvate carboxylase levels increase, unless there are offsetting changes in stomatal aperture. The principal effect of ribulose bisphosphate carboxylase/oxygenase on delta(13)C should occur through its effect on the extent of leakage of CO(2) from the bundle sheath cells. In this case, delta(13)C values should become more positive as ribulose bisphosphate carboxylase levels increase. Accordingly, the variation in delta(13)C values seen in maize leaves appears to be the result of variations in the level of phosphoenolpyruvate carboxylase.
More Related Videos
10:08Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development
Published on: March 5, 2017
06:11Improved Methods for Preparing Transverse Sections and Unrolled Whole Mounts of Maize Leaf Primordia for Fluorescence and Confocal Imaging
Published on: September 22, 2023
Related Concept Videos
Light Acquisition
Adaptations that Reduce Water Loss
C4 Pathway and CAM
C4 Pathway
The C4 pathway is used by plants such as...
Cell Specific Gene Expression
