Effect of drought stress and mycorrhizal inoculation on the growth, photosynthetic activity and water use efficiency of leek (Allium porrum L. 'Gigante Suizo')
2012
Jezdinsky, A., Mendelova Univ., Lednice (Czech Republic). Ustav Zelinarstvi a Kvetinarstvi | Petrikova, K., Mendelova Univ., Lednice (Czech Republic). Ustav Zelinarstvi a Kvetinarstvi | Slezak, K., Corvinus Univ. of Budapest (Hungary). Dept. of Vegetable and Mushroom Growing | Pokluda, R., Mendelova Univ., Lednice (Czech Republic). Ustav Zelinarstvi a Kvetinarstvi
Two irrigation levels: 1. optimal water supply - the irrigation activation by available water capacity (AWC) less than 65 %; 2. drought stress - irrigation activation by AWC less than 45 %) and inoculation of plants by the vesicular-arbuscular mycorrhizal fungus Glomus in leek culture. The effect of treatments on the photosynthetic rate (A), transpiration rate (E), water use efficiency (WUE), biomass production (weight, dry matter content of different plant part), size of pseudostem, leaf area and specific leaf area (SLA) was observed. The drought stress had effect on all observed variables: it decreased the photosynthetic and transpiration rates (A: from 5.04-5.37 to 3.33-3.43 micromol CO2/square m/s, E: from 1.78-1.91 to 0.99-1.03 mmol H2O/square m/s in the average of 5 measuring dates), the total fresh weight of plants (from 355-453 g to 152-255 g), the leaf area, the length and diameter of pseudostem. The WUE, the dry matter content and the thickness of leaves increased under stress. In most variables studied, the water supply had stronger effect than the inoculation. The inoculation had positive effect mainly under drought stress: it improved the WUE at 3 measuring times (from 3.45 to 3.50 micromol CO2/mmol/H2O, in the average of 5 measuring dates), increased the weight (total fresh weight of plants: from 152 g to 255 g) and the leaf area (from 0.16 to 0.12 square m).
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