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. Key words: Photosynthetic rate, stomatal conductance, evapotranspiration,intercellular CO2 concentration, chlorophyll a, chlorophyll b.
Highlights
Photosynthesis and chlorophyll concentration are directly related to N inputs in plants (Schepers et al, 1992; Blackmer and Schepers, 1995; Guo, 2001)
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
Summary
Photosynthesis and chlorophyll concentration are directly related to N inputs in plants (Schepers et al, 1992; Blackmer and Schepers, 1995; Guo, 2001). Nitrogen plays an important function in electron transport and photophosphorylation (Terashima and Evans, 1988). Of chloroplasts resulting in N being stored in the chloroplasts (Evans, 1989). It has been noted that the rate of photosynthesis and chlorophyll concentration are directly affected by nitrogen. The green pigmentation in the plant (chlorophyll) is directly related to N content, as N is stored in the chloroplasts (Evans, 1989; Schepers et al, 1992; Blackmer and Schepers, 1995). N richer plants are greener, whereas the deficient ones have yellow discolouration
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