The influence of waterlogging at different temperatures on penetration depth and porosity of roots and on stomatal diffusive resistance of pea and maize seedlings |
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Authors: | G Przywara W St?pniewski |
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Institution: | (1) Institute of Agrophysics, Polish Academy of Science, PO Box 201, 20-290 Lublin 27, Poland;(2) Technical University of Lublin, Nadbystrzycka 40, 20-618 Lublin, Poland |
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Abstract: | The 8 days old seedlings of pea (cv. Ilowiecki) and maize (cv. Alma F1) were subjected to differentiated aeration conditions (control — with pore water tension about 15 kPa and flooded
treatment) for 12 days at three soil temperatures (7, 15 and 25 °C). The shoots were grown at 25 °C while the soil temperature
was differentiated by keeping the cylinders with the soil in thermostated water bath of the appropriate temperature.
Lowering the root temperature with respect to the shoot temperature caused under control (oxic) conditions a decrease of the
root penetration depth, their mass and porosity as well as a decrease of shoot height, their mass and chlorophyll content;
the changes being more pronounced in maize as compared to the pea plants. Flooding the soil diminished the effect of temperature
on the investigated parameters; the temperature effect remaining significant only in the case of shoot biomass and root porosity
of pea plants. Root porosity of pea plants ranged from 2 to 4 % and that of maize plants — from 4 to 6 % of the root volume.
Flooding the soil caused an increase in the root porosity of the pea plants in the entire temperature range and in maize roots
at lower temperatures by about 1 % of the root volume. Flooding the soil caused a decrease of root mass and penetration depth
as well as a decrease of plant height, biomass and leaf chlorophyll content. |
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Keywords: | aeration flooding maize pea root porosity temperature |
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