Seyedeh nasrin Hosseini; Jalal Jalilian; esmaeil gholinezhad
Abstract
In order to investigate the effect of water deficit stress and stress modifiers on some morphological and physiological characteristics and yield of Quinoa, a pots factorial experiment, based on a completely randomized design, with 16 treatments and 6 iterations has been done during 2019 at Urmia University. ...
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In order to investigate the effect of water deficit stress and stress modifiers on some morphological and physiological characteristics and yield of Quinoa, a pots factorial experiment, based on a completely randomized design, with 16 treatments and 6 iterations has been done during 2019 at Urmia University. The first factor includes water deficit stress at four levels, stress at the vegetative growth stage, stress at the reproductive growth stage, stress at seed filling stage, and no stress (control). The second factor is foliar spraying of ascorbic acid, salicylic acid, nano-micronutrient chelate fertilizer, and control (water spray). Water deficit stress at different growth stages decreases plant height, a number of laterals, dry weight, fresh weight of vegetative organs, root volume, fresh, and dry weight of root and root length, compared to the control. However, electrolyte leakage and leaf temperature are increased. Results show that water deficit stress at post-anthesis stage decrease grain yield via decreasing 1000-grain weight. Foliar application of growth regulators by improving yield components, increase the yield of quinoa under water deficit stress condition. Therefore, according to the results, it seems that the use of stress modulators in quinoa under water deficit stress with stimulating growth and metabolism, lead to water deficit stress tolerance.
Mohsen Seilsepour; Ahmad Golchin; Mahmoud Reza Roozban
Abstract
A greenhouse experiment was carried out to evaluate the effects of salinity stress on growth and macroelements contents of two olive varieties in soilless culture medium. In the research, one-year old saplings of two olive varieties, ‘Zard’ and ‘Mission’, were subjected to different ...
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A greenhouse experiment was carried out to evaluate the effects of salinity stress on growth and macroelements contents of two olive varieties in soilless culture medium. In the research, one-year old saplings of two olive varieties, ‘Zard’ and ‘Mission’, were subjected to different salinity levels induced by NaCl including 0, 4, 8, 12 and 16 dS/m-1 for 5 months. Based on the results, total dry weights of the varieties were decreased at 16 dSm-1 compared to control up to 63 and 85% at ‘Mission’ and ‘Zard’, respectively. Also, a 25% reduction in total dry weight was observed under salinities of 7 and 3.6 dSm-1 for ‘Mission’ and ‘Zard’, respectively. Salinity was decreased the concentrations of macronutrients and increased the concentrations of Na and Cl in roots and leveas of the both varieties. Compared to control, Na and Cl concentrations in leaves and roots was increased under salinity of 16 dS/m-1 at 1660 and 679% for Na and 1069 and 506% for Cl. In all salinity levels, Na and Cl concentrations in the leaves and roots of 'Zard' variety were more than that of 'Mission'. Thesa data demonstrated that ‘Mission’ has a more salinity tolerance than ‘Zard’, and could be used as a salt-tolerant variety for cultivation under salinity conditions. The defence mechanisms of ‘Mission’ are restricting in absorbtion and translocation of Na to aerial parts and accumulate a proper concentration of K in Leaves.
Mohammad Ali Baghestani; Delavar Baghestani; Hamid Rahimian mashhadi; Hasan Mohammad Alizade
Volume 11, Issue 2 , November 2009, , Pages 19-27
Abstract
The biology and phenology of broomrape (Orobanche nana) on Almond (Prunus dulcis cv. Mamaei) was studied during the growth season in Shahrekord city of Iran in 2004. Twenty trees which were infested by broomrape, were selected. Results indicated that almonds need 2120.5 growth degree days (GDD) to complete ...
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The biology and phenology of broomrape (Orobanche nana) on Almond (Prunus dulcis cv. Mamaei) was studied during the growth season in Shahrekord city of Iran in 2004. Twenty trees which were infested by broomrape, were selected. Results indicated that almonds need 2120.5 growth degree days (GDD) to complete phenological stages from flowering to fruit ripening. Based on the cardinal temperature of broomrape (9.5°C), the parasite weed needs 209, 1125.5, 1414.5 and 961 GDD for completion of seed germination, stem emergence, flowering and seeding stages, respectively. Maximum seed germination occurred at the depth of 18 cm. Maximum root infection was observed at the depth of 9 to 12 cm. The highest infection to this parasite plant was recorded on roots with 9 to 11.9 mm diameter.