Influence of flooding temperature on the root penetration depth and porosity of two varieties of winter wheat
1996
Przywara, G. | Stepniewski, W.
The problems connected with deficient aeration of plant roots can be solved either by manipulating the environment to suit the plant or by adopting the plant to suit the environment. The latter approach seems to be more feasible and desirable from the environmental point of view. In this connection, the investigation of plant root porosity, being the most important adaptive feature to unfavourable oxygenation conditions, seems to be of primary importance. The aim of our study was to investigate the air-filled porosity and the penetration depth of roots of 20-day-old seedlings of two winter wheat varieties (Rosa and CZR 1406) subjected to oxygenation stress at different temperatures. The 8-day-old seedling stage of two leaves were subjected to differentiated aeration conditions (control with pore water pressure about 15 kPa) and flooded for 12 days at three soil temperatures (7, 15, and 26 degrees C). The shoots of the seedlings were grown at a temperature of 26 degrees C while the soil temperature was differentiated by keeping the cylinders with the soil in thermostated water of the appropriate temperature. The flooding increased the root porosity in the entire temperature range under consideration. The interrelations between root porosity, root penetration depth, shoot biomass, and temperature are discussed.
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