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African Journal of Biotechnology

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Effects of different combinations of Hoagland’s solution and Azolla filiculoides on photosynthesis and chlorophyll content in Beta vulgaris subsp. Cycla ‘fordhook giant’ grown in hydroponic cultures

A de Bever, PA Ndakidemi, CP Laubscher

Abstract


The assessments of photosynthetic rate, stomatal conductance,  evapotranspiration, intercellular CO2 concentration and chlorophyll content in Beta vulgaris subsp. cycla ‘Fordhook Giant’ grown in hydroponic cultures containing different compositions of hydroponic solutions were evaluated in this study. The aim of the study was to quantify the effects of different combinations of Hoagland’s solution and Azolla filiculoides on photosynthesis processes and chlorophyll content in B. vulgaris grown in hydroponic cultures. The following treatments were evaluated in four replications: (1) Control (Hoagland’s solution minus N solution excluding Azolla; (2) Hoagland’s minus N solution including Azolla; (3) full Hoagland’s solution plus Azolla; and (4) full Hoagland’s solution excluding Azolla. Results show that photosynthetic rate, evapotranspiration, intercellular CO2 concentration and chlorophyll were generally higher in full Hoagland’s solution. This was closely followed by full Hoagland’s solution plus Azolla, and Hoagland’s minus N solution plus Azolla treatments. The lowest photosynthetic rates and chlorophyll contents were found in the control (Hoagland’s minus N solution) treatment.

Keywords: Photosynthetic rate, stomatal conductance, evapotranspiration, intercellular CO2 concentration, chlorophyll a, chlorophyll b

African Journal of Biotechnology Vol. 12(16), pp. 2006-2012



http://dx.doi.org/10.5897/AJB12.1582
AJOL African Journals Online