Nitrate uptake kinetics of grapevine under root restriction

• Published in: Scientia horticulturae Vol. 111; no. 4; pp. 358 - 364
• Main Authors: Yang, Tianyi, Zhu, Lina, Wang, Shiping, Gu, Weijun, Huang, Danfeng, Xu, Wenping, Jiang, Aili, Li, Shicheng
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 16.02.2007; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Economic plant physiology; Fundamental and applied biological sciences. Psychology; grapes; Km and Vmax value; nitrate nitrogen; Nitrate uptake kinetics; nutrient solutions; nutrient transport; nutrient uptake; plant growth; plant nutrition; Root restriction; root systems; shoots; translocation (plant physiology); Vitis vinifera; “Fenghou” grapevine; Root restriction; “Fenghou” grapevine; Nitrate uptake kinetics; K m and V max value; Fenghou grapevine; Horticulture; Root; Vitis; Nitrates; Absorption; Km and Vmax value; Fruit crop; Vitidaceae; Dicotyledones; Angiospermae; Liana; Spermatophyta; Kinetic parameter
• ISSN: 0304-4238; 1879-1018
• DOI: 10.1016/j.scienta.2006.11.005

To examine the effect of root restriction on the nitrate uptake and the nitrate transport system activity, 2-year old “Fenghou” grapevines ( Vitis Vinifera × V. Labrasca) were planted in pots with volume 2 L and 12 L served as root restriction and the control, respectively. The pots were filled with perlite and watered with rainwater and nutrient solution. Vine growth and kinetics of nitrate uptake in vine roots were evaluated. The results showed that root restriction significantly inhibited the shoots and roots growth, enhanced the nitrate uptake rate, decreased the kinetics parameter K m value and increased V max value, that is to say, root restriction depressed the affinity of nitrate high-affinity transport system (HATS) and improved the nitrate uptake rates of both high (HATS) and low-affinity transport system (LATS). However, root restriction significantly decreased the amount of net nitrate uptake, which led to the low nitrate concentration in leaves and roots.