Seyed Basir Mousavi; Saeed Sayfzade; Hamid Jabbari; alireza valadabadi; Esmaeil Hadidi Masouleh
Abstract
The current study tries to evaluate the effect of auxin foliar application in two safflower cultivars under drought stress condition, using a factorial split plot experiment with randomized complete block design in two years (2017-2018 and 2018-2019). It has been conducted at research field of Seed and ...
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The current study tries to evaluate the effect of auxin foliar application in two safflower cultivars under drought stress condition, using a factorial split plot experiment with randomized complete block design in two years (2017-2018 and 2018-2019). It has been conducted at research field of Seed and Plant Improvement Research Institute in Karaj and evaluates irrigation at two levels including normal irrigation (control) and interruption of irrigation from the beginning of grain filling stage (drought) in the main plots and cultivars of Padideh and Goldasht and auxin foliar application in two levels of non-foliar application of distilled water (control) and foliar application of auxin (indole acetic acid) in one step (mid-flowering) at a concentration of 3000 mg.l-1 (30 ppm) in sub-plots as a factorial. In the auxin foliar application and non-foliar application (control) in both normal irrigation and drought stress treatments, the highest total number of heads per plant in Goldasht cultivar have been 26.3 and 24.3 respectively, and the highest grain number per plant observed in Goldasht cultivar have been at 708 and 592, respectively. Auxin foliar application and irrigation has had no significant effect on the grain oil percentage. Goldasht cultivar demonstrates a higher grain yield compared to Padideh cultivar due to lower head temperature, higher soluble carbohydrate concentration, number of heads, and 1000-grain weight. Generally, results show that the effect of the studied treatments is affected by the year and despite the positive effect of auxin foliar application on some yield components at both irrigation levels, foliar application of auxin at middle of flowering stage has no significant effect on grain yield.
Mojdeh Sadat Khayat Moghadam; Ahmad Gholami; Amir Hossein Shirani rad; Mahdi BaradaranFiroozabadi; Hamid Abbasdokht
Abstract
In order to study the effects of late-season drought stress and foliar application of potassium silicate on yield and yield components of spring genotypes of canola, a factorial split-plot experiment is conducted in Karaj, Iran in a randomized complete block configuration with three replications for ...
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In order to study the effects of late-season drought stress and foliar application of potassium silicate on yield and yield components of spring genotypes of canola, a factorial split-plot experiment is conducted in Karaj, Iran in a randomized complete block configuration with three replications for two years of cultivation (2016-2018). The irrigation is performed at two levels in this study, including routine irrigation (control) and interruption of irrigation from the pod formation stage. Potassium silicate foliar application at two levels is comprised of 0 and 4 g liter-1 in factorial status in main plots and five Brassica napus L. genotypes including OG×AL, RGS×SLM, DALGAN, RGS003 and RGS×Okapi in subplots. The results show that the measured properties are affected by the applied treatments. Full irrigation with foliar application in OG×AL genotype results in highest seed yield (5620 Kg/ha) and total chlorophyll content (1.71 mg/g.FW) increase stomatal resistance, leaf proline, leaf soluble and carbohydrates, decreasing total chlorophyll content and relative leaf water content. Under drought stress conditions, DALGAN and RGS× SLM genotypes have higher yield, which indicates its better performance under stress conditions. Finally, our research demonstrates Potassium Silicate's beneficial effects in improving the drought tolerance of canola plants, particularly at the end of the season. Our study will act as a foundation for any attempt in new approaches to mitigate drought damage, establishing a functional connection between the position of potassium silicate, physiological response, and drought stress tolerance in canola plants.