Agriculture and horticulture
M. Babaei; F. Sefidkon; M. Nasiri
Abstract
Two species Nepeta cataria L. and Nepeta bracteata Benth. (fam. lamiaceae) are native to Iran. To study the quantity and quality of the two species essential oil in the field, the seeds of eight populations from these two species were collected from natural habitats and planted in a randomized complete ...
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Two species Nepeta cataria L. and Nepeta bracteata Benth. (fam. lamiaceae) are native to Iran. To study the quantity and quality of the two species essential oil in the field, the seeds of eight populations from these two species were collected from natural habitats and planted in a randomized complete block design in Alborz Research Station of Research Institute of Forests and Rangelands (Karaj, Alborz province). The flowering branches were harvested at the full flowering stage and after room temperature-drying, their essential oils were extracted by hydrodistillation, and analyzed and identified by GC and GC/MS. The essential oil yield of N. cataria populations varied between 0.02 (Karaj) and 0.50% (Arak). Twenty-three compounds were identified in the essential oil of this species, and the main compound in all populations was from nepetalactone isomers. NepetalactoneIII (4aα,7β,7aα-nepetalactone) and nepetalactoneI (4aα,7α,7aα-nepetalactone) constituted 44.4 (Karaj) to 91.6% (Arak) and 0.8 (Karaj) to 15.9% (Bafgh1) of the essential oil, respectively. NepetalactoneII (4aα,7α,7aβ-nepetalactone) was observed only in the population Bafgh2 (21.2%). The amount of 1,8-cineole in the essential oil of different N. cataria populations varied from 0.4 (Taft1) to 12.8% (Karaj). The essential oil yield of N. bractaeta populations was obtained between 0.02 (Ardakan) and 0.70% (Taft2). Twenty-seven compounds were identified in the essential oil of this species, and the main compounds were 1,8-cineole (1.0, 9.6, and 41.0% in Tabas, Ardakan, and Taft2, respectively) and geranyl acetate (0.9, 3.4, and 39.8% in Tabas, Taft2, and Ardakan, respectively). In general, the results showed that the N. cataria populations were all from the same chemotype, but N. bracteata populations were from two chemotypes (ct. geranyl acetate and ct. 1,8-cineole).
M. Bahrami; M.A. Alizadeh; M. Nasiri
Abstract
In order to study of dry matter yield, essential oil and morphological traits in Nepeta spp., nine accessions belonging to three species including Nepeta racemosa Lam., Nepeta menthoides Boiss. & Buhse and Nepeta cataria L. were evaluated in the Alborz research station, Karaj Iran ...
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In order to study of dry matter yield, essential oil and morphological traits in Nepeta spp., nine accessions belonging to three species including Nepeta racemosa Lam., Nepeta menthoides Boiss. & Buhse and Nepeta cataria L. were evaluated in the Alborz research station, Karaj Iran in 2014. The seeds of accessions were sown in pots in greenhouse and then were transferred to field at vegetative growth stage. The accessions were arranged in a complete randomized block design in three repetitions. Each plot contained 15 spaced plants with 0.5 m intervals. The drip irrigation system was used for irrigation. Data were collected for plant height, flowers per plant, the canopy area, canopy diameter length, fresh and dry matter yield, and essence percentage. To extract the essential oil, the foliage was harvested at flowering stage and dried, milled and the essential oil was extracted using distillation method with water. Data were analyzed of variance and species means were compared based on Duncan method. The results of analysis of variance showed significant difference among the species for all traits except fresh and dry foliage yield. Result indicated that N. cataria was late maturity species and both N. menthoides and N. racemosa were early maturity species. The lowest canopy area was recorded for N. cataria as compared with the two other species. N. cataria had the highest plant height with an average value of 90.1 cm and N. racemosa had the highest flower density with an average value of 15.7 flowers per plant. For N. cataria, the Acc. 15062-Arak was a late maturity species and had higher essential oil yield. Similarly, the Acc. 21132-Bafgh had higher foliage production. In N. menthoides, the Acc. 27795-Meshkinshar had the highest canopy area.
