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Showing 3 results for Shakeri
Effect of Salinity Stress on Some Physiological Traits and Electrophoresis Pattern of Leaf Proteins of Two Barley Genotypes
F. Tavakoli, S. Vazan, K. Sorkheh, E. Shakeri,
Volume 6, Issue 19 (5-2016)
Abstract

This experiment was conducted in order to evaluate the effect of salinity stress on some traits of two barley genotypes (Hordeum vulgare L.) at greenhouse of Department of Agronomy and Plant Breeding, Shahrekord University, Shahrekord, Iran. A factorial experiment was carried out based on randomized complete block design (RCBD) with three replications. Treatments included two barley genotypes (Afzal (salt-tolerant) and Ligne527 (salt-sensitive)) and five levels of salinity (Control, 100, 200, 300 and 400 mM NaCl). Results showed that salinity left significant effects on leaf RWC, chlorophyll a and b, sodium, potassium, magnesium, calcium and protein concentrations, sodium/potassium ratio and yield components of barley genotypes. Based on the electrophoresis pattern, protein bands were increased by increasing the salinity levels and protein bands with different molecular weight were observed in different salinity levels. It was found that high concentration of potassium ion along with low concentrations of sodium and proline in barley leaf can be used as a criterion for selection and planting this crop in saline conditions. In addition, identification and isolation of the genes encoding salt resistance proteins in barely and transferring of these genes to sensitive genotypes of crop plants can be useful for breeding and generation of tolerant varieties to salinity.


Evaluation of Yield, Yield Components and Stress Tolerance Indices in Bread Wheat Cultivars at Post-anthesis Irrigation Cut-Off
Ghasem Halim, Yahya Emam, Ehsan Shakeri,
Volume 7, Issue 4 (Winter 2018)
Abstract

Wheat grain yield reduction occurs in most wheat growing regions of Iran due to post-anthesis water stress. This research was conducted to evaluate yield and yield components of wheat cultivars in normal irrigation and post anthesis irrigation cut-off conditions as a split-plot arrangement based on a randomized complete block design with three replications during 2015-16 in College of Agriculture, Shiraz University, Shiraz, Iran. The main plots included irrigation regimes (normal irrigation until the end of the growth season and irrigation cut-off from flowering to maturity) and subplots composed of 20 bread wheat cultivars. The results showed that irrigation cut-off caused a significant reduction in biological yield (46.4%), grain yield (59%), harvest index (23.7%), number of grains per spike (27.1%) and 1000 grain weight (13.8%). The highest grain yield in normal irrigation (1002 gm-2) and post anthesis irrigation cut-off conditions (485.7 gm-2) was obtained from Danesh cultivar. Among indices, stress tolerance index (STI), mean productivity (MP), and geometric mean productivity (GMP) had positive and significant correlations with grain yield in stress and non-stress conditions. Therefore, it appeared that these indices might be suitable for identification and selection of wheat cultivars that are tolerant to post anthesis irrigation cut-off. In general, the results indicated that Danesh, Sirvan, Baharan, Jones and Symonyda cultivars out–yielded the remaining ones under both stress and non-stress conditions.
 


Modeling the Effect of Pot Culture on Yield and Water Use of Soybean in Gorgan
G. Soleimanzadeh, A. Soltani, B. Torabi, H. Ebrahimi, E. Shakeri,
Volume 10, Issue 3 (10-2020)
Abstract
Transplanting or pot culture has been mentioned as a promising approach to increase crop yield and decrease irrigation water use in recent years. Using simulation models to assess pot culture is a valuable way in investigating the effect on yield, water consumption and other properties of crops such as soybean. For this purpose, several pot culture levels (seedling sizes) plus direct sowing were evaluated in soybean using SSM-iCrop2 for four different sowing dates in Gorgan, Iran. Seedling sizes were 13, 18, 24 and 29 cm2 per plant leaf area and at 200, 250, 300 and 350 °C cumulative temperature, respectively. Sowing dates were June 10 (early), June 25 (usual), July 14 (late) and July 27 (very late). The results of simulation showed that direct seed planting method at late sowing date (14 July) and all treatments at very late sowing date (27 July) are not feasible and cannot be recommended due to disturbance that cause in sowing of next crop in double cropping system of the region. Transplanting method at early (10 June), usual (25 June) and late planting dates resulted in earlier maturity. There was no significant difference between two methods regarding seed yield at early and usual planting dates, but at late planting date transplanting method resulted in higher yield compared to direct seed planting method. Seedling size had no significant effect on yield. In addition, there was no significant difference among sowing methods in all planting dates in terms of net irrigation requirement of soybean. It was concluded that transplanting is only preferred at late sowing date for its higher yield, but considering the higher production costs of this method compared to direct sowing, it is necessary to find some cost-effective measures before pot culture could be adopted by farmers.

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