contribution to the history of photosynthesis: de saussure,
pelletier, caventou  and dutrochet

Nicolas Thiodore de Saussure (1767-1845) was of French descent but born in and has since lived in Geneva. He conducted experiments on carbon assimilation in which he disregarded the Phlogiston Theory.

In his Recherches Chimiques sur la Végétation which was published in1804, he showed that the green parts of plants take up and decompose carbon dioxide from the air and at the same time assimilate water. He also found that the process of carbon dioxide decomposition was essential to plant growth and development (Hart 2005). He identified that water was the source of hydrogen and carbon dioxide was the source of plant carbon (Myers 2007).

He therefore confirmed the discoveries of Ingenhousz and Jan Senebier, adding further that the process of photosynthesis requires water as shown in the following equation (Moore et al. 2003):

carbon dioxide + water + light - -> organic material + oxygen

In addition, he found that by artificial means it was possible to increase the concentration of carbon dioxide in the atmosphere sorrounding a plant up to levels that can injure the plant. He measured the amount of carbon fixed by plants and noted that its quantity was lower than the increase in plant weight. He concluded that the plant body was composed mainly of carbon dioxide fixed from the atmosphere with a portion derived from the soil solution.

Along with Jan Ingenhousz and Jean Senebier, he founded the modern theory of plant nutrition. He argued that the minerals composing the ash of plants were not accidental elements taken in with soil water. They are essential to plant growth and development even though they may occur only in extremely small quantities. He also distinguished between two types of essential elements: one is effective in trace amounts while the other is needed in large amounts.

De Saussure likewise studied respiration. He concluded that respiration was necessary to plant growth and that the requirement of plants for oxygen was higher in plant parts which are physiologically active (Hart 2005).

Pierre-Joseph Pelletier (1788-1842), Joseph-Bienaime Caventou (1795–1877) and René-Joachim-Henri Dutrochet (1776–1847)

In 1818, the French chemists Pierre Joseph Pelletier and Joseph Bienaimé Caventou isolated and named chlorophyll, the green pigment in plants that acts as the principal light-absorbing molecule in the process of photosynthesis. The name chlorophyll literally means green leaf. It came from two Greek words: chloros (yellow-green) and phyllon (leaf). The first to recognize the essential role of chlorophyll in photosynthesis was René-Joachim-Henri Dutrochet (1776–1847) in 1837 (Myers 2007).

Note: The lists of contributors and Literature Cited are in the History of Photosynthesis Mainpage.

(Ben G. Bareja, June 2012)

Antoine-Laurent Lavoisier <<<   >>> Julius Robert von Mayer

<<< What is Photosynthesis?


Back to Home Page

Recent Articles

  1. How To Make Bonsai Deadwood Without Doing It

    Aug 08, 19 09:06 AM

    Author reveals how he creates or enhances bonsai deadwood such as shari and jin by employing the expertise of insect sculptors.

    Read More

  2. What Is, Definition or Meaning: In Crop Agriculture

    Jul 31, 19 09:17 PM

    A navigational aid in searching for articles in this site dealing with what is or definitions or meaning of terms.

    Read More

  3. Bonsai Shaping Technique Did Amazing Transformation

    Jul 29, 19 07:01 AM

    Demonstrates bonsai shaping in which an “ugly” multiple trunked tree was magically converted into cascade prebonsai.

    Read More

  4. Let The Plastic Tent Take Care of Your Potted Plants in Absentia

    Jul 23, 19 09:23 PM

    Tip: Apply the plastic tent or kulob method to serve as caretaker of bonsai or other favorite potted plants in case of extended leave.

    Read More