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.
High temperature stress in summer season at plastic house is a limiting factor for tomato fruit set and yield. This study was performed to assess the effects of gibberellic acid (GA 3 ) and 2,4-Dichlophenoxy acetic acid (2,4-D) spray on fruit set, yield, and quality of tomato cv. 'Adoration'(Enza Zaden Co., Ltd.) under the plastic house in Hwacheon, 2011. Four concentrations (0-, 5-, 10-and 15mg•L −1 ) of GA 3 , and three concentrations (0-, 5-and 10mg•L −1 ) 2,4-D were sprayed in early flowering of tomato in the plastic house, and fruit set, yield and quality characters were observed. The results showed that spray of 10mg•L −1 GA 3 significantly increased the fruit set by 14.2% than unsprayed. The spray of GA 3 significantly increased the marketable fruit number, fruit weight, and yield. The spray of 2,4-D on blossoms significantly affected the fruit set percentage, fruit weight, marketable fruit weight and yield, and the highest fruit set observed as 62.5% in combined spray of GA 3 and 2,4-D at each 5mg•L −1 . Fruit size and total soluble solids significantly varied with the concentrations of GA 3 sprayed. The result indicates that the spray of 10mg•L −1 GA 3 and 5mg•L −1 2,4-D can be more economic and effective to increase the fruit set, and yield in tomato under high temperature condition in plastic house.
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