Next Article in Journal
Evaluation of Future Water Use for Electricity Generation under Different Energy Development Scenarios in China
Previous Article in Journal
The Traditional Technological Approach and Social Technologies in the Brazilian Semiarid Region
Article Menu
Issue 1 (January) cover image

Export Article

Open AccessArticle
Sustainability 2018, 10(1), 12;

Stomatal Behavior of Cowpea Genotypes Grown Under Varying Moisture Levels

Risk and Vulnerability Center, University of Limpopo, P Bag X1106, Sovenga 0727, South Africa
Faculty of Bioscience Engineering, Ghent University, B-9000 Gent, Belgium
Author to whom correspondence should be addressed.
Received: 13 October 2017 / Revised: 13 December 2017 / Accepted: 17 December 2017 / Published: 23 December 2017
(This article belongs to the Section Sustainable Agriculture, Food and Wildlife)
Full-Text   |   PDF [5409 KB, uploaded 23 December 2017]   |  


Drought is a major limitation to crop productivity worldwide. Plants lose most of their water through stomata, thus making stomata an important organ in the control of transpiration and photosynthesis. This study assessed the stomatal behavior of four cowpea genotypes grown under four moisture levels under hot semi-arid conditions. Stomatal conductance (gs) was measured at 47, 54, 70 and 77 days after planting (DAP). Biomass and carbon isotope composition (δ13C) were also determined at flowering. Genotype and moisture level significantly influenced gs. Genotypes varied in gs at vegetative stages (47 and 54 DAP) only. TVu4607 had higher gs under severe drought conditions at both 47 and 54 DAP. On the other hand, moisture level influenced gs at 54 and 70 DAP only. Stomatal conductance was severely restricted in cowpea under both moderate and severe drought conditions as gs was mostly below the threshold 0.10 mol m−2 s−1. Relationships between: biomass and gs, and δ13C and gs were positive under severe drought only. The findings revealed that cowpea genotypes vary in gs under dry conditions and that the variation is more prominent at vegetative stage, suggesting that cowpea productivity in dry areas could be improved through selection of genotypes that maintain higher gs under dry conditions. View Full-Text
Keywords: carbon isotope composition; cowpea; stomatal conductance; water stress carbon isotope composition; cowpea; stomatal conductance; water stress

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Munjonji, L.; Ayisi, K.K.; Boeckx, P.; Haesaert, G. Stomatal Behavior of Cowpea Genotypes Grown Under Varying Moisture Levels. Sustainability 2018, 10, 12.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sustainability EISSN 2071-1050 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top