Assessment of Disturbances in Growth and Physiology of Carrot Caused by Chromium Stress

Autor:	B. K. Dube, Chitralekha Chatterjee, Pratima Sinha
Rok vydání:	2009
Předmět:	Chlorosis biology Physiology Phosphorus Turgor pressure food and beverages chemistry.chemical_element biology.organism_classification chemistry.chemical_compound Horticulture chemistry Chlorophyll Shoot Botany Leaf size Agronomy and Crop Science Plant nutrition Daucus carota
Zdroj:	Journal of Plant Nutrition. 32:479-488
ISSN:	1532-4087 0190-4167
DOI:	10.1080/01904160802679925
Popis:	To see the deleterious effects of excess chromium (Cr) on carrot (Daucus carota L.) the cv. ‘Pusa Keshari’ was grown in refined sand under controlled glasshouse conditions with a complete nutrient solution (without Cr) for 48 days. On the 49th day, pots with two plants each were separated into three sets. One set served as a control. In each of the other two sets, Cr was supplied as dichromate at 0.1 and 0.5 mM to the basal nutrient solution. At 0.5 mM Cr toxicity symptoms appeared at d 52 (4 days after Cr supply) as reduction in growth and leaf size and loss of turgor. Old leaves became chlorotic and wilted. Chlorosis intensified and turned necrotic in another few days. These symptoms spread to next upper leaf. The development of chlorosis in leaves was delayed in plants receiving 0.1 mM Cr. At excess Cr (0.5 mM) in carrot, the biomass, concentration of chlorophylls a and b, iron (Fe), sulfur (S), and phosphorus (P) in shoots, and activity of catalase (CAT) in leaves decreased whereas the concen...
Databáze:	OpenAIRE
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