Mojtaba Kaboodkhani; Hadi salek mearaji; Keyvan aghaei; Afshin Tavakoli
Abstract
Quinoa is one of the salinity tolerant plants, capable of playing an important role in providing human food in the future. In order to investigate the effect of salinity stress on physiological traits and yield of quinoa cultivars, a two-factor factorial experiment was conducted as random complete block ...
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Quinoa is one of the salinity tolerant plants, capable of playing an important role in providing human food in the future. In order to investigate the effect of salinity stress on physiological traits and yield of quinoa cultivars, a two-factor factorial experiment was conducted as random complete block design with three replications in 2020 year under greenhouse conditions. Experimental treatments include three quinoa cultivars (Titicaca, Q26, and Giza1) and three salinity levels (0, 15, and30 dS/m). Salinity stress reduced traits such as photosynthetic pigments, relative leaf water content, and grain yield. The chlorophyll a and b content in control conditions, compared to the salinity level of 30 dS/m, have decreased by 46% and 77%, respectively, with the yield dropping by 35.6%, but the decrease in relative water content has been 12.6%. Electrolyte leakage, proline and malondialdehyde content, catalase, and guaiacol peroxidase activity have increased under salinity stress condition. The Q26 cultivar has had the highest content of carotenoids, chlorophyll a, relative water content, soluble proteins, proline, and catalase activity, compared to the others. Titicaca cultivar has had lower malon-dialdehyde (MDA) content and electrolyte leakage than Q26 and Giza1 cultivars, which indicates the least damage to cell membranes, being superior to the other two cultivars. Giza1 cultivar also has had higher chlorophyll b and carotenoids content than the other two cultivars. Q26 and Giza1 cultivars are probably the most resistant and sensitive cultivars to salinity stress, respectively.
Leyli Golchin; Afshin Tavakoli; Ehsan Mohseni Fard
Abstract
In order to evaluate the increment possibility of safflower seed yield and oil percentage through the application of cytokinin, a split factorial experiment has been conducted based on randomized complete block design with four replications at the research farm of Agriculture Faculty, the University ...
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In order to evaluate the increment possibility of safflower seed yield and oil percentage through the application of cytokinin, a split factorial experiment has been conducted based on randomized complete block design with four replications at the research farm of Agriculture Faculty, the University of Zanjan, during the 2018-2019 and 2019-2020 cropping seasons. In this experiment, irrigation levels include optimal irrigation and drought stress to main plots and safflower cultivars, namely Sina, Faraman, Parnyan, Gholdasht, and Mahaly Esfahan, and three levels of cytokinin (6-Benzyl Aminopurine), including non-application (control), 50, and 75 μM, have been allocated to subplots as factorial. At the flowering stage, simultaneous with applying drought stress, safflower plants havee been sprayed with 6-Benzyl Aminopurine. Results show that drought stress has decreased yield components, seed yield, biological yield, harvest index, oil percentage, and oil yield and the application of cytokinin minimizes the negative impacts of drought stress, while boosting the above traits. The highest seed yield has been obtained from applying 75 μM of cytokinin, with an increase of 30.7% compared to the control. Also, among the studied cultivars, the Mahaly Esfahan cultivar under optimal irrigation with an average of 36.09% shows a higher oil percentage, compared to other cultivars. Therefore, the use of cytokinin can be suggested as a solution to decrease the negative effects of drought stress and enhance seed yield and oil percentage of safflower under optimal irrigation and drought stress conditions.
hadi salek mearaji; Afshin Tavakoli; Aiaz Ali niazsepahvand
Abstract
In order to investigate the effects of foliar application of 6-benzylaminopurine on physiological traits, yield and yield components of quinoa (cultivar Q26) an factorial experiment has been conducted, based on randomized complete block design with four replications at the research farm of Agriculture ...
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In order to investigate the effects of foliar application of 6-benzylaminopurine on physiological traits, yield and yield components of quinoa (cultivar Q26) an factorial experiment has been conducted, based on randomized complete block design with four replications at the research farm of Agriculture Faculty, the University of Zanjan, during cropping seasons of 2017. The experimental factors include optimal irrigation (-0.4 MPa) and drought stress (-1.5 MPa) as primary factor and foliar 6-benzylaminopurine in three levels (0, 50, and 100 μM) as the secondary one. Irrigation treatment has significant effect on all traits, except chlorophyll b and cartenoide. Drought stress increases electrolyte leakage (EL), proline, and Harvest index (HI) though it has a declingin effect on other traits. The effect of irrigation and hormone interaction has been considerable, except for chlorophyll b, total chlorophyll, thousand weight grain, and biomass yield. The highest grain yield (215.75 g.m2) in optimal irrigation is observed in 50 μM and in drought stress condition with 149.76 g.m2, obtained in 100 μM of cytokinin. The maximum harvest index (25.6%) can be observed in the control treatment of drought stress. Results show that applying cytokinin reduces the unfavorable effects on quinoa; therefore, this hormone’s foliar can be a solution to enhance the grain yield of quinoa under drought stress conditions.
Mahsa Mohammadi; Afshin Tavakoli; Majid Pouryousef; Ehsan Mohsenifard
Abstract
In order to evaluate the increment possibility of bean seed yield by the application of brassinosteroid, a split factorial experiment was conducted based on randomized complete block design with three replications at the research farm of Agriculture Faculty, the University of Zanjan during the 2016-2017 ...
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In order to evaluate the increment possibility of bean seed yield by the application of brassinosteroid, a split factorial experiment was conducted based on randomized complete block design with three replications at the research farm of Agriculture Faculty, the University of Zanjan during the 2016-2017 cropping season. In this experiment, irrigation levels included optimal irrigation and drought stress were applied to main plots and bean cultivars including Kusha cultivar and COS16 genotype, and four levels of brassinosteroid including of no-application (control), two, four and six μM were allocated to subplots as factorial. Drought stress was applied at the flowering stage, and bean plants were sprayed with brassinosteroid (epibrassinolide) simultaneously with drought stress. The results showed that drought stress decreased leaf area index, yield components, seed yield, biological yield and harvest index and the application of epibrassinolide minimized the negative effects of drought stress and increased in the above traits. The highest seed yield was obtained by application of two μM of epibrassinolide with an average of 2068.2 kg.ha-1. Also, among the studied cultivars, the Kusha cultivar under optimal irrigation with an average of 3025.45 kg.ha-1 showed a higher seed yield compared to COS16 genotype. Therefore, the use of epibrassinolide can be suggested as a solution to increase drought stress resistance and enhance seed yield of bean under optimal irrigation and drought stress conditions.