Effects of N fertilization on root development and activity of water-stressed cotton (Gossypium hirsutum L.) plants

Rui-Xian Liu, Zhi-Guo Zhou, Wen-Qi Guo, Bing-Lin Chen and Derrick M. Oosterhuis

Agricultural Water Management, 2008, vol. 95, issue 11, 1261-1270

Abstract: The objective of this investigation was to study effects of nitrogen on drought resistance in terms of changes in cotton (Gossypium hirsutum L.) root dry matter accumulation, N concentration, antioxidant enzyme activities and root vigor during short-duration water stress (withholding water for 8 days and then permitting to 10 days recover by re-watering). Cotton plants were grown in pots with three N levels (0, 240, and 480 kg N ha-1). Soil-relative water content decreased with increasing N supply during the soil water stress period, while leaf area, dry matter production and N accumulation were enhanced. The root/shoot ratio and root-N/shoot-N ratio increased with water stress, and were smallest at 240 kg N ha-1. Application of N increased the activities of peroxidase (POD) and catalase (CAT) of cotton root, but decreased superoxide dismutase (SOD) activity during water stress as well as during recovery. Malondialdehyde (MDA) content was significantly (p

Keywords: Nitrogen; Water; stress; Cotton; Root; development; Antioxidant; enzyme; activity; Root; vigor (search for similar items in EconPapers)
Date: 2008
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Citations: View citations in EconPapers (3)

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