Scholarly article on topic 'Effect of Water Deficiency on Different Genotypes of Balanites Aegyptiaca'

Effect of Water Deficiency on Different Genotypes of Balanites Aegyptiaca Academic research paper on "Agriculture, forestry, and fisheries"

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Procedia Environmental Sciences
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Keywords
{" Balanites aegyptiaca L." / "biometrical growth parameters" / "stomatal conductance" / "volumetric water content" / "water deficit"}

Abstract of research paper on Agriculture, forestry, and fisheries, author of scientific article — G. Khamis, F. Schaarschmidt, J. Papenbrock

Abstract Water deficit is strongly affecting plant development and production. With the decrease in rainfall in many areas and the shortage of arable land for growing food crops, there is a demand to find alternative plant species that could be cultivated in non-arable land for food supplies and bioenergy. Balanites aegyptiaca L. is a multi-purpose tree belonging to the family of Balanitaceae distributed in North and West Africa, and West Asia. The species is considered as drought-tolerant serving as a source of many secondary metabolites and having a potential for biofuel production. This study aimed to examine and compare the morpho-physiological responses to water stress of six different B. aegyptiaca genotypes collected from different regions. Different regimes of soil volumetric water content (VWC 35% as a control, VWC 20% as moderate and VWC 5% as a severe drought stress) were chosen to finally select the most drought-tolerant genotype under greenhouse conditions. Several growth parameters, stomata conductance, photosynthetic efficiency, infrared thermography and metabolites contents were analyzed to investigate and compare the drought impact among B. aegyptiaca genotypes. The results indicate that at severe drought stress each genotype has an independent strategy to cope with the water shortage through a significant reduction in biomass parameters, early stomata closure combined with small changes in photosynthetic activity and producing a high concentration of ascorbic acid and proline. Finally, we found that i) Balanites genotypes showed different morphological and physiological responses to cope with the water shortage, ii) collections of two or three parameters could distinguish the water stress levels among the genotypes, and iii) genotype El-Kharga showed the highest drought-tolerance compared to the other genotypes. It shows the lowest magnitude of biomass reduction and early stomata closure as strategy of saving leaf water content under severe drought stress.

Academic research paper on topic "Effect of Water Deficiency on Different Genotypes of Balanites Aegyptiaca"

Available online at www.sciencedirect.com

ScienceDirect PfOCGCl 10

Environmental Sciences

Procedia Environmental Sciences 29 (2015) 49 - 50

Agriculture and Climate Change - Adapting Crops to Increased Uncertainty (AGRI 2015) Effect of water deficiency on different genotypes of Balanites aegyptiaca

G. Khamis1,2* , F. Schaarschmidt3 and J. Papenbrock1 institute of Botany, Leibniz University Hannover, Hannover, Germany 2National Institute of Laser Enhanced Sciences, Cairo University, Cairo, Egypt 3Institute of Biostatistics, Leibniz University Hannover, Hannover, Germany

CrossMar]

Abstract

Water deficit is strongly affecting plant development and production. With the decrease in rainfall in many areas and the shortage of arable land for growing food crops, there is a demand to find alternative plant species that could be cultivated in non-arable land for food supplies and bioenergy. Balanites aegyptiaca L. is a multi-purpose tree belonging to the family of Balanitaceae distributed in North and West Africa, and West Asia. The species is considered as drought-tolerant serving as a source of many secondary metabolites and having a potential for biofuel production. This study aimed to examine and compare the morpho-physiological responses to water stress of six different B. aegyptiaca genotypes collected from different

* Corresponding author. Tel.: 004917670727193. E-mail address: glkhames@gmail.com

1878-0296 © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Peer-review under responsibility of the organizing committee of the Agriculture and Climate Change - Adapting Crops to Increased

Uncertainty (AGRI 2015)

doi:10.1016/j.proenv.2015.07.150

G. Khamis et al. / Procedia Environmental Sciences 29 (2015) 49 - 50

regions. Different regimes of soil volumetric water content (VWC 35% as a control, VWC 20% as moderate and VWC 5% as a severe drought stress) were chosen to finally select the most drought-tolerant genotype under greenhouse conditions. Several growth parameters, stomata conductance, photosynthetic efficiency, infrared thermography and metabolites contents were analyzed to investigate and compare the drought impact among B. aegyptiaca genotypes. The results indicate that at severe drought stress each genotype has an independent strategy to cope with the water shortage through a significant reduction in biomass parameters, early stomata closure combined with small changes in photosynthetic activity and producing a high concentration of ascorbic acid and proline. Finally, we found that i) Balanites genotypes showed different morphological and physiological responses to cope with the water shortage, ii) collections of two or three parameters could distinguish the water stress levels among the genotypes, and iii) genotype El-Kharga showed the highest drought-tolerance compared to the other genotypes. It shows the lowest magnitude of biomass reduction and early stomata closure as strategy of saving leaf water content under severe drought stress.

© 2015 The Authors. Published by Elsevier B.V This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Peer-reviewunderresponsibilityof theorganizingcommitteeof the AgricultureandClimateChange-AdaptingCrops to Increased Uncertainty(AGRI2015)

Keywords: Balanites aegyptiaca L., biometrical growth parameters, stomatal conductance, volumetric water content, water deficit

References

1. Guretzki S, Papenbrock J (2013) Characterization of Lablab purpureus regarding drought tolerance, trypsin inhibitor activity and cyanogenic potential for selection in breeding programmes. J Agron Crop Sci 200:24-35

2. Hall JB, Walker DH, (1991) B. aegyptiaca Del. A Monograph. School of Agricultural and Forest Science, University of Wales, Bangor

3. Farooq M, Wahid A, Kobayashi N, Fujita D, Basra SMA (2009) Plant drought stress: effects, mechanisms and management. Agro Sustain Dev 29:185-212