Effects of Waterlogging on Nitrogen Accumulation and Alleviation of Waterlogging Damage by Application of Nitrogen Fertilizer and Mixtalol in Winter Rape (Brassica napus L.)

Abstract

A study on the physiological and yield effects of waterlogging and the alleviation of waterlogging damage by the application of nitrogen fertilizers and mixtalol in winter rape was conducted in experimental tanks especially designed for controlling soil moisture content. The results showed that waterlogging at the seedling and stem elongation stages causes a significant decrease in nitrogen content and rate of nitrogen accumulation. Leaf chlorophyll content, superoxide dismutase and catalase activities, and root oxidizability (capacity for root oxidation) and root exudate were also reduced by waterlogging. The experiments confirmed that the physiological function of rape plants was retarded during the time of waterlogging at the seedling stage, and its adverse effects remained. Plant height, stem width, and the number of primary branches per plant were decreased significantly by waterlogging at the seedling and stem elongation stages. Pods per plant and seeds per pod were also reduced significantly, giving a 21.3 and 12.5% decrease of seed yield from the control for treatments at the seedling and stem elongation stages, respectively. Foliar sprays of nitrogen fertilizers at the seedling stage or mixtalol at the flowering stage alleviated plant damage caused by waterlogging by retarding chlorophyll and nitrogen degradation, increasing superoxide dismutase and catalase activities and root oxidizability, and improving yield components and seed yield of waterlogged plants. Therefore, besides draining off water, alleviation of waterlogging damage may be controlled by applying nitrogen fertilizer and a suitable plant growth regulator at appropriate growth stages.

Mapping Above-Ground Biomass of Winter Oilseed Rape Using High Spatial Resolution Satellite Data at Parcel Scale under Waterlogging Conditions

“…This could be a major reason that the podding stage maps showed a different trend than the crop growth. As for the response of crops to waterlogging, most of the previous studies put more emphasis on the impacts of waterlogging on photosynthesis and the transpiration rate, plant hormones, antioxidant enzymes, and other physiological and biochemical indices [11,13,47], and the influence of waterlogging stress on plant morphological indices, such as plant height, green leaf number, effective pod number, yield per plant, and 1000-grain weight [3,4,8,10,12]; few studies have been done on the vegetation growth and health information, such as LAI and AGB under waterlogging conditions [69,[72][73]. In this study, we find that waterlogging stress can reduce the oilseed rape biomass, which has a similar consequence with previous studies [3,4,74].…”

“…Few studies have been conducted on different growth stages of field-grown oilseed rape under varying soil moisture [4,10,11]. Detailed field experiments have been predominantly directed toward analyzing the impacts of soil water content variability on physiological parameters and fruit yield [8,12,13]. Indeed, water productivity relates crop production to water use and is a key indicator for evaluating agricultural water management [9].…”

Effects of nitric oxide on alleviating cadmium stress in Typha angustifolia

“…The supernatant was used for enzyme activity assay. SOD activity was determined as previously described by Zhou et al (1997). CAT activity was determined by measuring the changes in absorbance at 470, 240 and 290 nm, respectively (Aebi 1984).…”

Waterlogging tolerance in barley is associated with faster aerenchyma formation in adventitious roots

“…Oxygen deprivation reduces ATP levels in plants, causing other physiological and biochemical problems (Bailey-Serres and Voesenek 2008;Colmer 2003b). Common symptoms of waterlogging injury include reduced shoot nitrogen content, leaf area, biomass, shoot growth, root growth, and chlorophyll content (Malik et al 2001;Pang et al 2004;Zhou et al 1997).…”