Asghar Sadeghi Chah-Nasir; Abdolhossein Abootalebi Jahromi; Behnam Behrooznam; Hamed Hassanzadeh Khankahdani; Abdolkarim Ejraei
Abstract
The foliar application of organic compounds and biofertilizers is a suitable method for optimal nutrition of plants. This study aimed to investigate the effect of the foliar application of humic acid and amino acids on the quantitative and qualitative characteristics of tomato fruits under field conditions ...
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The foliar application of organic compounds and biofertilizers is a suitable method for optimal nutrition of plants. This study aimed to investigate the effect of the foliar application of humic acid and amino acids on the quantitative and qualitative characteristics of tomato fruits under field conditions in 2019-2020. The treatments included the control, three concentrations of humic acid (1, 2, and 3 g L-1), three concentrations of amino acids (2, 4, and 6 g L-1), and combined treatment of humic acid (3 g L-1) + amino acid (3 g L-1). The results showed that the effect of the treatments on plant fresh and dry weight, leaf chlorophyll content, fruit number, total yield and marketability, and fruit quality except the fruit length was significant. The highest leaf pigment content, fruit number (30.3 per plant), yield (50.3 tons ha-1), and marketable yield (43.1 tons ha-1) were related to the combined treatment of humic acid + amino acids. Furthermore, the highest fruit quality characteristics such as firmness, TSS, vitamin C, anthocyanin, and potassium were observed for the humic acid at 3 g L-1, which showed no significant difference with the combined treatment of humic acid + amino acid. In general, it was found that the foliar application of organic compounds improved the yield, yield components, and fruit quality of tomato plants, so that the combined application of humic acid (3 g L-1) + amino acids (3 g L-1) had the highest effect on improving the quantitative and qualitative characteristics of tomato plants.
Ali Hatami; Abdolhossein Abootalebi Jahromi; Abdolkarim Ejraei; Abdol Hossein Mohammadi Jahromi; Hamed Hassanzadeh Khankahdani
Abstract
Due to the calcareous nature of most soils in areas under date cultivation, this study was conducted to improve the quality and quantity of date fruits in Zahidi cultivar using the foliar applications of organic matters and micronutrients at two stages of date growth. For this purpose, an experiment ...
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Due to the calcareous nature of most soils in areas under date cultivation, this study was conducted to improve the quality and quantity of date fruits in Zahidi cultivar using the foliar applications of organic matters and micronutrients at two stages of date growth. For this purpose, an experiment was conducted to evaluate the effects of foliar applications of organic matters and micronutrients on contents and properties of biochemical compounds and minerals in Zahidi date fruit. The study was performed as a randomized complete block design with 11 treatments in three replications on 33 date palms for two consecutive years. The treatments were applied in two stages (at the beginning and end of the Kimri stage) on fruits and upper leaves. Treatments included amino acids, Aminabon 50 (0.5 and 0.1 g L-1), seaweed (0.25 and 0.5 g L-1), micronutrients (0.1 and 1.5 g L-1), and four combined treatments obtained from different concentrations of amino acids, seaweed, and micronutrients. Spraying with distilled water served as the control treatment. The results showed that the treatments had a significant effect on all studied traits. The highest content of copper was observed in response to amino acid + micronutrients (1.63 mg kg-1). The effects of amino acid + seaweed + micronutrients on the other traits were observed in the highest statistical class. In general, the latter combined treatment was the most efficient with the lowest content of soluble tannin (26.46 mg g-1) compared to the control (32.12 mg g-1) and to the other treatments.
Hamed Hassanzadeh Khankahdani; Mahmoud Bagheri; Sibgol Khoshkam
Abstract
Eggplant has high variation in the world and there are many landraces of the eggplant in Iran. In the previous studies, five landraces of Minab’s eggplant have been collected from the main production regions with the aim to select the pure lines, consequently 15 superior genotypes were selected ...
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Eggplant has high variation in the world and there are many landraces of the eggplant in Iran. In the previous studies, five landraces of Minab’s eggplant have been collected from the main production regions with the aim to select the pure lines, consequently 15 superior genotypes were selected from these landraces and their stability and compatibility were analyzed. In the present study, 15 eggplant genotypes together with two superior mother landraces were studied for the two successive years in the three regions of Iran including Minab, Karaj, and Jiroft. Based on the results of the means comparison of yield in the studied lines in each region from average of two years, GHE12 line in Minab region, SA13 line in Jiroft region, and AM4, SA15, and SA5 lines in Karaj region had acceptable yield than the other studied lines. According to the results of general compatibility and stability analysis, the three genotypes of Y7, AM7 and SA15 were recognized as the most stable genotypes with having the least interaction; therefore, they categorized as the first ranking of stability. According to the results of special compatibility and stability analysis, AM7, Y7 and GHE12 lines for Minab region; AM5 and SA5 lines for Jiroft region and SA5 and AM4 lines for the Karaj region can be recommended.
Yaaghoob Hosseini; Hamed Hassanzadeh Khankahdani; Ramezan Rezazadeh
Abstract
‘Siyahoo’ mandarin (Citrus reticulata) is one of the most important high-quality cultivars of citrus. The alternate bearing, especially in old trees, is one of the most important economic problems faced by this cultivar, which adversely affects the fruit quality. This study was carried out ...
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‘Siyahoo’ mandarin (Citrus reticulata) is one of the most important high-quality cultivars of citrus. The alternate bearing, especially in old trees, is one of the most important economic problems faced by this cultivar, which adversely affects the fruit quality. This study was carried out to examine the effects of the timing of nitrogen foliar application (mid-November, mid-December, and mid-January) as urea 0.5% and harvest time (the first time: concordant with the minimum commercial ratio of TSS/TA and the second time: 45 days after the first time) on improving the fruit yield and quality of ‘Siyahoo’ mandarin during five successive years from 2012 to 2017 using 36 trees. The results showed that the second harvest time (conventionally practiced) produced the highest yield compared to the first harvest time (for the lowest TSS/TA ratio). The highest yield was obtained in the second harvest time when nitrogen was sprayed in November. The significant interaction of harvest time and spray timing revealed the lower pH (~3) in the first harvest compared to the second one (~4). Nitrogen spraying in November and January yielded the highest (8-10) and lowest (<8) TSS/TA ratio, respectively. Although, the effect of the timing of nitrogen spraying on the fruit weight was not significant, spraying in January increased the fruit weight by 10% compared to the November spraying. Variations in the fruit diameter followed a similar pattern to variation in the fruit weight, which was due to their correlations. In conclusion, it is recommended to harvest the fruits after second nitrogen application, because the higher fruit yield and quality in terms of sweetness and flavor (TSS/TA ratio) are more acceptable.
Hamed Hassanzadeh Khankahdani; Abdoolnabi Bagheri
Abstract
Date palm (Phoenix dactylifera L.) is a monocot, dioecious and high longevity tropical plant greatly considered due to its high economic importance in Middle East. This investigation was carried out to detect genetic relations among 34 cultivars of Iranian date palm, both males and females, using ISSR ...
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Date palm (Phoenix dactylifera L.) is a monocot, dioecious and high longevity tropical plant greatly considered due to its high economic importance in Middle East. This investigation was carried out to detect genetic relations among 34 cultivars of Iranian date palm, both males and females, using ISSR markers. Accordingly, total DNA was extracted using CTAB method and was subjected to PCR amplification using 12 ISSR primers. Analysis of ISSR data indicated that PIC value varied from 0.3695 to 0.4998 with average of 0.4497. The highest PIC value belonged to (CT)10 G primer (0.4498). Totally, 112 alleles were recognized. According to morphological attributes and ISSR markers, the 34 studied date cultivars divided into eight main groups and different sub-groups, and no significant correlation between grouping made by morphological and molecular markers. Unlike ISSR markers that produced a clear-cut among male and female cultivars, no distinct border was seen among male and female cultivars using morphological attributes. Furthermore, PCA analysis confirmed the grouping made by ISSR markers. In conclusion, ISSR markers have been useful to separate date palm cultivars.
Hamed Hassanzadeh Khankahdani; Somayeh Rastegar; Behrouz Golein; Morteza Golmohammadi; Abdolhossein Aboutalebi Jahromi
Abstract
Because of sexual propagation of Mexican lime in southern regions of Iran, there are many lime accessions (lime biotypes) in Mexican lime gardens in which appear some variation in fruit and tree shape. However, most of these accessions are susceptible to witches broom disease of lime (WBDL). Persian ...
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Because of sexual propagation of Mexican lime in southern regions of Iran, there are many lime accessions (lime biotypes) in Mexican lime gardens in which appear some variation in fruit and tree shape. However, most of these accessions are susceptible to witches broom disease of lime (WBDL). Persian lime (C. latifolia Tanaka) is a triploid WBDL-tolerant species. Considerable number of un-described lime biotypes have been cultivated by farmers as Persian lime with no documented evidence related to their origin and genetic background. To unveil systematic modality of the lime accessions, we investigated 18 lime accessions collected from Fars, Hormozgan and Mazandaran provinces (Iran) using flow cytometry (FCM) approach, morphological characteristics, ISSR and SSR markers in 2016. The results of FCM revealed that 14 out of 18 lime accessions were triploid. Triploid accessions showed higher leaf dimension values together with lower stomata and secretory sacs density compared with diploid accessions. Application of SSR markers confirmed the obtained results of ploidy level determination using FCM and morphological analysis. Results of morphological and ISSR markers demonstrated that four out of 18 accessions were different from others and it was in correspondence with the results of FCM. SSR results also grouped the accessions in line of FCM. In conclusion, it has been shown that IFJKh, Cucumber-shaped lime and IFJKMes accessions, are diploid and their cultivation is not recommended in the infected regions to WBDL phytoplasma.
Abdolhossein Abootalebi Jahromi; Hamed Hassanzadeh Khankahdani
Abstract
Effects of humic acid on some vegetative characteristics and mineral concentrations of Mexican lime were investigated under different salinity concentrations. Four doses of humic acid (0, 1500, 3000 and 4000 mg/kg soil) and four salinity levels (1500, 2500, 3500 and 4500 µmos) were applied on Mexican ...
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Effects of humic acid on some vegetative characteristics and mineral concentrations of Mexican lime were investigated under different salinity concentrations. Four doses of humic acid (0, 1500, 3000 and 4000 mg/kg soil) and four salinity levels (1500, 2500, 3500 and 4500 µmos) were applied on Mexican lime seedlings. Experiment was conducted as a factorial arrangement based on a completely randomized design. The results showed that humic acid had a positive influence on plant height under salinity stress. Shoot number was significantly increased by application of humic acid under salinity stress conditions. In 4500 µmos salinity, application of 4500 mg/kg humic acid caused an increase in shoot fresh and dry weights, root dry weight and shoot potassium concentration. Percentage of sodium was decreased by application of 3000 mg/kg humic acid in the shoot of plants that were exposed to 4500 µmos salinity level. humic acid at 1500 mg/kg caused a reduction in shoot sodium percentage under 3500 µmos salinity level. When compared to the non-treated plants, application of humic acid led to a decline in chloride percentage in Mexican lime seedlings. In conclusion, 3000 and 4000 mg/kg humic acid can be used to reduce the toxic effects of salinity and also to decrease the uptake of toxic elements such as sodium and chloride in Mexican lime seedlings.
