Effect of oxygen deficiency on uptake of water and mineral nutrients by tomato plants in soilless culture
| Autor: | Philippe Morard, Ludovic Lacoste, Jérôme Silvestre |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Journal of Plant Nutrition. 23:1063-1078 |
| ISSN: | 1532-4087 0190-4167 |
| DOI: | 10.1080/01904160009382082 |
| Popis: | The consequences of oxygen deficiency on the root system of tomato plants in soilless culture at the beginning of the flowering stage were assessed over a 72‐hour period. The study of water uptake and oxygen depletion in the medium was conducted using a process of continuous computerized data processing. Fluctuations in composition of the nutrient solution were monitored every two hours through an analysis of samples. Oxygen deficiency of the nutrient solution had immediate effects on the water and nutrient uptake of the whole plant. The root asphyxia of a tomato plant caused a 20 to 30% decrease of water uptake after 48 hours. After 10 hours it also leads to the end of the uptake process of the nutrients except nitrates. Potassium (K) was the nutrient most sensitive to oxygen deprivation since an efflux into the culture medium was observed after only 4 hours of deprivation. Nitrate uptake was the least affected by oxygen deficiency. The persistent appearance of nitrite in the culture medium 12 h... |
| Databáze: | OpenAIRE |
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