Farideh Sadeghi; Yousef sohrabi; Adel SioSe Mardeh
Abstract
In order to study the effect of cytokinin, gibberellin, and cycocle on yield and yield components of two wheat cultivars under different irrigation regimes, a study was conducted as a split-split experiment based on a randomized complete block design with three replications at the Agricultural Research ...
Read More
In order to study the effect of cytokinin, gibberellin, and cycocle on yield and yield components of two wheat cultivars under different irrigation regimes, a study was conducted as a split-split experiment based on a randomized complete block design with three replications at the Agricultural Research Station of Kurdistan University in 2016. There, the irrigation factor at four levels: dryland, irrigation at booting stage, irrigation at booting + flowering and irrigation at booting + flowering + grain filling stages have served as the main plots, two wheat cultivars (Sirvan and Homa) as sub-plots, and levels of plant growth regulators foliar application including, i.e. control, gibberellin (100 µm), cytokinin (100 µm), and cycocel (3gr. lit-1) at the wheat stem elongation and grain filling stages as the sub-sub plots. Results show that in the foliar application during the stem stage, compared to the dryland treatment, yield increase in one, two, and three irrigation treatments have been 29%, 33%, and 43%, and at the grain filling stage; 22%, 28%, and 33%, respectively. Homa cultivar produced higher yield compared to Sirvan. In the foliar application during the stem stage, the highest grain yield (504 g m-2) belongs to application of three irrigation treatments as well as addition of cytokinin, and at the grain filling stage, the highest grain yield (477.6 g m-2) has been obtained from Homa cultivar under three times irrigation condition and cycocel consumption. Therefore, using even one stage irrigation and the application of cytokinin and cycocel can increase the grain yield of wheat.
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 ...
Read More
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.
Saeid Hazrati; Amir Reza Sadeghi-Bakhtvari; Davood Kiani
Abstract
The present study aims at evaluating the effects of leaf foliar of growth regulators and nitrogen on growth parameters and yield of spring safflower. To do so it has carried out a research at East Azerbaijan Agricultural Research Center as a factorial experiment based on RCBD (Randomized Complete Block ...
Read More
The present study aims at evaluating the effects of leaf foliar of growth regulators and nitrogen on growth parameters and yield of spring safflower. To do so it has carried out a research at East Azerbaijan Agricultural Research Center as a factorial experiment based on RCBD (Randomized Complete Block Design) with three replications. The factors include growth regulators in four levels, namely auxin, cytokinin, auxin + cytokinin (wherein the treatment’s concentration has been 1000 mg/L), and control (no use of growth regulator, whatsoever), foliar application of nitrogen (3 and 6 per thousand), and two springcultivars (Soffe and Goldasht). Results show taller plants (17%) and greater number of heads per plant (39%), seeds per head (9%), and lateral stems (37%) for Soffeh cultivar, compared to Goldasht variety. On the other hand, Goldasht cultivar provides the maximum head diameter (15%) and 1000 seed weight (47%), in comparison to Soffeh cultivar. The maximum grain yield is observed for Soffeh cultivar with auxin growth regulator and a concentration of three per thousand foliar application of nitrogen (3205 kg ha -1),displaying no significant difference from either the control or the application of three per thousand foliar of nitrogen (3120 kg ha-1). The application of growth regulators has changed the fatty acid composition. The application of auxin + cytokinin as the growth regulator with a concentration of three and six per thousand foliar of nitrogen increase the oleic, palmitic, and linolenic acids. However, the use of auxin and cytokinin separately increase linoleic and stearic acids among the fatty acids, compared to the control, which is higher in Soffeh cultivar than Goldasht. In general, Soffeh cultivar shows higher growth and yield, compared to Goldasht cultivar, indicating the positive effect in foliar application of hormones and nitrogen for the latter.