Influence of nutrient concentrations and NaCİ salinity on the growth, photosynthesis, and essential oil content of peppermint and lemon verbena

• Published in: Turkish journal of agriculture and forestry Vol. 31; no. 4; pp. 245 - 253
• Main Authors: NAZARİ, Javad, TABATABAIE, Seyed, Jalal
• Format: Journal Article
• Language: English
• Published: TÜBİTAK 2007
• Subjects: Aloysia triphylla; azot; Bahçe Bitkileri Ürünleri; besin maddesi içeriği; besin maddesi çözeltisi; Bitki Beslenmesi; Bitki Bileşimi; Bitkide Çevre Toleransı; büyüme; chemical composition; electrical conductivity; elektrik iletkenliği; Environmental Tolerance of Plants; essential oil plants; essential oils; fosfor; fotosentez; growth; Horticultural Crops; kimyasal bileşim; leaf area; leaves; Mentha piperita; menthol; mentol; mineral content; mineral madde içeriği; monoterpenes; monoterpinen; nitrogen; nutrient content; nutrient solutions; phosphorus; photosynthesis; Plant Composition; Plant Nutrition; potassium; potasyum; salinity; stres; stres yanıtı; stress; stress response; tuzluluk; uçucu yağ bitkileri; uçucu yağlar; yaprak alanı; yapraklar
• ISSN: 1300-011X; 1303-6173

Growth and essential oil content of peppermint {Menhta piperita var. officinalis) and lemon verbena {Lipia citriodora var. Verbena) were evaluated in response to salinity and nutrient solution concentrations, measured as electrical conductivity (EC 0.7, 1 1 1.4, 2.8, 5.6, and 5.6 dS rrf). In peppermint, the highest fresh weight and dry weight were observed in the 1.4 dS rrf treatment. Na 1 The increased EC with either NaCl or all nutrients at 5.6 dS rrf reduced the fresh weight of lemon verbena. The maximum fresh 1 1 weight and dry weight in lemon verbena were obtained in both 1.4 and 2.8 dS m"" treatments. Increasing EC level up to 2.8 dS rrf 1 increased leaf area but the leaf area was reduced by 5.6 dS nrf treatment achieved by adding NaCl or all nutrients. The rate of photosynthesis (Pn) was higher in treatments with EC levels of 1.4 and 2.8 as compared to the other treatments. In both peppermint 1 and lemon verbena, the concentrations of N, P, and K increased as the EC of the solution increased from 0.7 to 5.6 dS rrf but in the 5.6 treatment their concentrations fell. The total content of essential oil was reduced by increasing the EC of the solution Na 1 because of the reduction in total fresh weight of the plants. In peppermint, the essential oil content in the 1.4 dS m" treatment was 55.0% and 40.5% higher than those of both 5.6 and 5.6 treatments, respectively. The major constituents of the essential oil in Na peppermint were menthol and menthone and in lemon verbena they were geranial and neral in all treatments. The increased Pn and 1 leaf area in moderate EC level led to improved plant growth. Consequently, t.4-2.8 dS m" could be an optimum EC value in peppermint and lemon verbena production.