Effect of Oxygen Deficiency on Mineral Nutrition of Excised Tomato Roots

Autor:	Ludovic Lacoste, Jérôme Silvestre, Philippe Morard
Rok vydání:	2004
Předmět:	Physiology Potassium fungi food and beverages chemistry.chemical_element Xylem Hydroponics Oxygen chemistry.chemical_compound Horticulture Nutrient chemistry Nitrate Respiration Botany Agronomy and Crop Science Plant nutrition
Zdroj:	Journal of Plant Nutrition. 27:613-626
ISSN:	1532-4087 0190-4167
DOI:	10.1081/pln-120030371
Popis:	The influence of oxygen deficiency on uptake of water and mineral elements through root system was studied on detopped tomato plants for 48 h. The root exudates and the nutrient solutions were collected and analyzed every two hours after decapitation of the shoots at the early fruiting stage. The lack of oxygen in the nutrient solution induced the appearance of nitrite ions in the nutrient medium and in the xylem sap. Nitrites were derived from nitrate reduction by tomato root cells. This mechanism, called “nitrate respiration”, should be an alternative pathway to have oxygen as electron acceptor during root anoxia and could be a transient adaptation to hypoxic conditions. The lack of oxygen in the nutrient medium caused a 42% reduction of water consumption by excised tomato roots during the experiment. The deprivation of oxygen induced also an efflux of potassium, magnesium, phosphate and sulfate in the nutrient solution. So, this experimentation allows to obtain information about macronutrient ...
Databáze:	OpenAIRE
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