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Evaluation of Photosynthetic Efficiency in Photorespiratory Mutants by Chlorophyll Fluorescence Analysis

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Acclimation to High CO(2) in Monoecious Cucumbers : I. Vegetative and Reproductive Growth.

¹Department of Horticultural Science, Box 7609, North Carolina State University, Raleigh, North Carolina 27695-7609.

Plant Physiology

|January 1, 1986

Summary

Elevated carbon dioxide (CO(2)) levels did not enhance cucumber growth or fruit yield. While early flowering increased, higher CO(2) concentrations led to more male flowers but no significant fruit weight or number increase.

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Area of Science:

Horticultural Science
Plant Physiology
Environmental Science

Background:

Controlled environment agriculture (CEA) often involves manipulating atmospheric conditions.
Carbon dioxide (CO(2)) is a key factor influencing plant photosynthesis and growth.

Purpose of the Study:

To investigate the impact of elevated CO(2) concentrations on cucumber (Cucumis sativus L.) growth, development, and yield.
To determine if increased CO(2) levels enhance biomass, leaf area, fruit production, or alter resource allocation in monoecious cucumbers.

Main Methods:

Cucumber plants (cv Chipper) were grown in controlled environment chambers with two CO(2) concentrations: 1000 and 350 microliters per liter.
Measurements included total fruit weight, fruit number, average fruit weight, biomass, leaf area, relative growth rates, and flower production.

Main Results:

Elevated CO(2) (1000 µL/L) did not significantly increase total fruit weight or number compared to ambient levels (350 µL/L).
Biomass, leaf area, and relative growth rates were unaffected by higher CO(2) beyond 16 days post-seeding.
While early flowering was enhanced, elevated CO(2) resulted in a greater proportion of male flowers at fruiting, with no significant overall fruit yield increase.

Conclusions:

Under the tested conditions, elevated CO(2) does not provide a significant growth or yield advantage for monoecious cucumbers.
The shift in flower sex ratio under high CO(2) warrants further investigation for crop management implications.