Growth and physiological response to manganese toxicity in Chinese cabbage (Brassica rapa L. ssp. campestris)

Abstract

This study was conducted to assess the effect of manganese (Mn) treatment on the growth and physiological characters of Chinese cabbage (Brassica rapa L. ssp. campestris). Seedlings were transplanted to plastic pots filled with soil and then grown in a plastic house. Four treatments with Mn (control, 15 µM, 300 µM, and 1.5 mM) were applied to plants along with half-strength Hoagland solution. The plant growth characters leaf length, leaf size, chlorophyll content, and fresh and dry weight of shoots and roots decreased significantly with high (1.5 mM) Mn treatment. As the concentration of Mn increased, K, Ca, Mg, Fe, Zn, and Cu content in outer leaves decreased, but the concentration of total N, P, and Mn increased significantly. Chlorophyll a decreased significantly with increasing Mn concentration. Maximum photochemical efficiency (Fv/Fm) was highest (0.893) in the control followed by 15 µM and 300 µM Mn-treated plants, whereas CO2 assimilation decreased with increasing Mn. Total free amino acids also significantly decreased with an increasing Mn. Hence, growth and physiological characters of Chinese cabbage demonstrated tolerance upto 300 µM Mn with nutrient solution in pot culture.Additional key words: chlorophyll content, CO2 assimilation rate, Mn, maximum photochemical efficiency, tolerance, total free amino acid Hort. Environ. Biotechnol. 52(3):252-258. 2011.

Effect of Manganese Nutrition on Content of Nutrient and Yield of Lettuce (Lactuca Sativa L.) in Hydroponic/Wpływ Żywienia Manganem Na Zawartość Składników I Plonowanie Sałaty (Lactuca Sativa L.) W Hydroponice

“…Manganese is antagonistic ion in relation to iron and calcium [44] and potassium, magnesium, zinc and copper [16,20,45,46]. This microelement reduced also content other metallic microelements in plants [19].…”

“…This microelement also significantly influence on the uptake of other nutrients like phosphorus, potassium, calcium, magnesium, iron, zinc, copper [14][15][16][17][18][19][20]. The aim of conducted studies was effect of increase manganese in the nutrient solution on content of nutrient and yielding of lettuce (Lactuca sativa L.) in hydroponic cultivation.…”

Transcriptome analysis of soybean leaves response to manganese toxicity

“…Mn toxicity can also increase the production of reactive oxygen free radicals and cause oxidative stress [8,9]. Furthermore, the absorption, transportation and distribution of other nutrients including calcium, magnesium and iron can be inhibited by Mn toxicity [10,11].…”

Manganese Hyperaccumulators and their Hyperaccumulating and Tolerance Mechanisms: A Review of the Current State of Knowledge

“…However, Mn accumulation in excess of the normal range of 20-500 mg/kg of the plant dry weight [5] can have negative effects on plants. Excess Mn inhibits seed germination [6] and plant growth [7], causes biomass loss [8], decreases the photosynthetic rate [9], inhibits root development [10] and hinders the adsorption of other nutrients [11]. Furthermore, Mn toxicity affect the human nervous system and cause parkinsonian syndrome [12].…”