Agriculture and horticulture
Z. Azimzadeh; A. Hassani; B. Abdollahi Mandoulakani; E. Sepehr
Abstract
Oregano (Origanum vulgare L.) is a perennial herbaceous plant belonging to the fam. lamiaceae that is used as a spice for flavoring foods and also for medicinal purposes as carminative, diaphoretic, expectorant, sedative, stomachic, diuretic, antitussive, and antirheumatic. To evaluate the effects of ...
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Oregano (Origanum vulgare L.) is a perennial herbaceous plant belonging to the fam. lamiaceae that is used as a spice for flavoring foods and also for medicinal purposes as carminative, diaphoretic, expectorant, sedative, stomachic, diuretic, antitussive, and antirheumatic. To evaluate the effects of salinity stress on some growth and physiological parameters, essential oil content, and nutrients absorption in two oregano subspecies, a factorial pot experiment was conducted in a completely randomized design with three replications. The experimental factors included two subspecies of oregano (ssp. vulgare and ssp. gracile) and salinity stress at four levels (0, 25, 50, and 100 mM of NaCl). The results showed that the salinity stress had a significant effect on the measured parameters. With increasing the salinity level, the growth characteristics (plant height, stem diameter, number of leaves, and dry matter yield), leaf relative water content (RWC), chlorophyll index (SPAD), percentage and essential oil yield, N, P, and K content and K/Na ratio in leaves and roots decreased, while Na and Cl content in leaves and roots of both subspecies increased. The two subspecies response to the different levels of salinity stress was different. The higher Na accumulation in the roots and higher K/Na ratio in the leaves compared to the roots indicated the ability of oregano subspecies to limit the transfer and accumulation of Na+ ions in their shoots. Overall, the findings of this study showed that the ssp. vulgare had higher tolerance to the salinity stress than ssp. gracile due to the less accumulation of Na and Cl ions, higher K/Na ratio, and lower reduction in chlorophyll index and dry matter yield.
B. Abbaszadeh; E. Sharifi Ashourabadi; M.H. Lebaschi; M. Naderi hajibagher Kandy; F. Moghadami
Abstract
In this research effect of drought stress on physiological characteristics of balm (Melissa officinalis L.) was performed under field condition in Karaj, Iran in 2005. Experiment was conducted using randomized complete block design with 4 replications. Treatment included T1 (non stress), T2 (80%FC), ...
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In this research effect of drought stress on physiological characteristics of balm (Melissa officinalis L.) was performed under field condition in Karaj, Iran in 2005. Experiment was conducted using randomized complete block design with 4 replications. Treatment included T1 (non stress), T2 (80%FC), T3 (60%FC), T4 (40%FC) and T5 (20%FC). Effect of drought stress on chlorophyll a, chlorophyll b, proline, soluble sugars, relative water contents, percentage and yield of essential oil were significant (α=0.001). Effect of drought stress on total chlorophyll was significant (α=0.005). Comparison of treatment means showed that highest chlorophyll a (1.921mg/l), chlorophyll b (1.197mg/l), total chlorophyll (2/283mg/l) were related to T1 (control), T5 (20%FC) and T1 (control), respectively. Highest accumulation of proline with 2.545 mg/l mean was related to T3 (60%FC). Maximum relative water content with 93.369 mean percentage related to T1 (control). It could be concluded that plant accumulation of proline and solublesugars increased tolerance and showed that moderate drought stress is beneficial for balm production.
Z. Baher Nik; M. Mirza; B. Abbaszadeh; M. Naderi Hajy Bagher Candy
Volume 23, Issue 3 , November 2007, , Pages 315-322
Abstract
Since the relationship between soil and water status of plants and its effect on growth, propagation and metabolism process, the effect of water stress on Parthenium argetatum, was investigated. Irrigation treatments were selected based on different percentage of field capacity (FC), including (1)a control ...
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Since the relationship between soil and water status of plants and its effect on growth, propagation and metabolism process, the effect of water stress on Parthenium argetatum, was investigated. Irrigation treatments were selected based on different percentage of field capacity (FC), including (1)a control sample which was irrigated to full field capacity during the growing season (FC), (2) two moderate water stress treatments (LS1=75% and LS2=50% of field capacity) and (3) severe water stress treatments (HS=25% of field capacity). Results showed that plant RWC (relative water content) decreased from 65.8% to 42.8%. Also water stress induced high amount of sugar and proline. The amount of sugar was the highest in sever treatment (HS=2.9 mg/g FW) while it was the least in FC treatment (1.07 mg/g FW). The amount of proline was the highest in sever treatment (HS= 4.28 mM) while it changed from 1.1 in LS1, 1.56 in LS2 and the least (0.96 mM) in FC treatments.
