Title: The effect of root and shoot temperature of 8°C or 24°C on the uptake and distribution of nitrogen in white clover (Trifolium repens L.)
Abstract: Limited information is available on the factors influencing the uptake and distribution of nitrogen (N) at low temperatures. This experiment quantified the distribution of N in white clover at root and shoot temperatures of 8°C or 24°C. Stolon tip cuttings of white clover (Trifolium repens L.) were grown in silica sand. After 62 days, plants were transferred to an 8°C or 24°C controlled environment room and, to quantify the distribution of N, a pulse of 15KNO3 was applied. Thereafter, plants were supplied with a complete nutrient solution containing NH4NO3 at a concentration calculated to provide plants with 20% of their N requirement. Plants were harvested at 0, 1, 4, 8, 24, 168, or 336 h. Leaf area and dry weights plus 14N/15N distribution in all fractions and total N concentration were measured. At both temperatures, the dry weights in all fractions increased significantly (P < 0.05) with time. After 336 h the amount of labelled 15N contained in the laminae and petioles was lower at 8°C than at 24°C. The higher 15N recovery in the laminae and petioles, and the higher lamina N%, indicated more N had been transported from the roots to the laminae at 24°C. This investigation suggests that temperature does affect the movement of N around the plant, with a consequent effect on N pool sizes and, hence, growth.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 11
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot