Plant Physiology | VOL. 90
Read

<sup>14</sup>C Fixation by Leaves and Leaf Cell Protoplasts of the Submerged Aquatic Angiosperm <i>Potamogeton lucens</i>: Carbon Dioxide or Bicarbonate?

Publication Date Jul 1, 1989

Abstract

Protoplasts were isolated from leaves of the aquatic angiosperm Potamogeton lucens L. The leaves utilize bicarbonate as a carbon source for photosynthesis, and show polarity; that is, acidification of the periplasmic space of the lower, and alkalinization of the space near the upper leaf side. At present there are two models under consideration for this photosynthetic bicarbonate utilization process: conversion of bicarbonate into free carbon dioxide as a result of acidification and, second, a bicarbonate-proton symport across the plasma membrane. Carbon fixation of protoplasts was studied at different pH values and compared with that in leaf strips. Using the isotopic disequilibrium technique, it was established that carbon dioxide and not bicarbonate was the form in which DIC actually crossed the plasma membrane. It is concluded that there is probably no true bicarbonate transport system at the plasma membrane of these cells and that bicarbonate utilization in this species apparently rests on the conversion of bicarbonate into carbon dioxide. Experiments with acetazolamide, an inhibitor of periplasmic carbonic anhydrase, and direct measurements of carbonic anhydrase activity in intact leaves indicate that in this species the role of this enzyme for periplasmic conversion of bicarbonate into carbon dioxide is insignificant.

Concepts
Powered ByUnsilo

Conversion Of Bicarbonate
Carbon Source For Photosynthesis
Free Carbon Dioxide
Bicarbonate Utilization
Carbon Dioxide
Leaf Strips
Plasma Membrane
Carbonic Anhydrase
Inhibitor Of Carbonic Anhydrase
Photosynthetic Utilization

Introducing Weekly Round-ups!Beta

Powered by R DiscoveryR Discovery

Round-ups are the summaries of handpicked papers around trending topics published every week. These would enable you to scan through a collection of papers and decide if the paper is relevant to you before actually investing time into reading it.

Climate change Research Articles published between Jun 13, 2022 to Jun 19, 2022

R DiscoveryJun 20, 2022
R DiscoveryArticles Included:  5

Understanding the effects of the snow ratio on glacier mass balance under variable climatic conditions is crucial for predicting how glaciers will res...

Read More

Good health Research Articles published between Jun 13, 2022 to Jun 19, 2022

R DiscoveryJun 20, 2022
R DiscoveryArticles Included:  5

In West Africa, the various types of diabetes according to WHO or the American Diabetes Association (ADA) are endemic; a particular type referred to a...

Read More

Gender Equality Research Articles published between Jun 13, 2022 to Jun 19, 2022

R DiscoveryJun 20, 2022
R DiscoveryArticles Included:  5

This study aims to evaluate changes in the presence of women on Spanish boards after the Unified Good Governance Code of Listed Companies (2006) and t...

Read More

Coronavirus Pandemic

You can also read COVID related content on R COVID-19

R ProductsCOVID-19

ONE PROBLEM . ONE PURPOSE . ONE PLACE

Creating the world’s largest AI-driven & human-curated collection of research, news, expert recommendations and educational resources on COVID-19

COVID-19 Dashboard