Plant Productions

Effect of Different Concentrations of Spermidine at Different Harvesting Times on the Quality of Apricot Fruits ”Shahroudi“ Cultivar

Jassim Taha; Jafar Hajilou

Volume 43, Issue 3 , November 2020, , Pages 409-418

https://doi.org/10.22055/ppd.2019.28168.1703

Abstract

Abstract Background and Objectives Apricot is one of the most important horticultural crops because of its attractive taste and nutritive value. Different cultivars of ... Read More Abstract Background and Objectives Apricot is one of the most important horticultural crops because of its attractive taste and nutritive value. Different cultivars of apricot contain highly variable content of ascorbic acid, cartenoids, and phenolic compound,which are good sourecs of antioxidant. Fuit quality is an important trait for concumers and producers. The purpose of this work was to estimate the effects of pre-harvest application of polyamines on quality characteristics of apricot fruits at the end of fruit ripening process. Materials and Methods The experiment was carried out as a factorial based on the randomized complete block design (three concentrations of spermidine at three harvesting time) with four replications. The selected branches of trees were sprayed as a pre-harvesting application method by three concentrations of spermidine (0, 2, and 3 mili molar) 7 days before commercial harvesting time. Fruits were harvested during harvesting times (3 days interval) and then some fruit characteristics such as total soluble solids (TSS), total ccidity (TA), vitamin C, firmness of fruit tissue, pH of fruit extract, total phenol, flavonoid, and total antioxidant capacity were measured in the laboratory of flower biology and fruit growth development at the department of horticulture, faculty of agiculture, university of Tabriz. Results The results showed that the effects of different harvesting times were significant regarding all traits. The best results were observed in 3 mM spermidine and this treatment improved all the measured characteristics of fruit. The highest value of total antioxidant capacity (3.01%), vitamin C (3.29%), and fruit firmness (3.27%) were found in 3 mM spermidin at three harvesting times. In some characteristics such as TSS and TA, there was no significant difference between 2 and 3 mM spermidine, but among treated and non-treated fruit a full significant difference was observed. We assume that the second harvesting time can be the best harvesting time regarding fruit quality parameters. During fruit ripening, the amount of TSS and TA increased, while firmness, total phenolic, and flavonoids compounds and total antioxidant capacity decreased gradually. Discussion Fruit physicochemical properties are very important for understanding the product behaviour during the harvesting, transporting, packaging, and storing of fruit crops. The results of this study showed that the pre-harvesting application of polyamines delayed the ripening and increased the quality of fruit during the different harvestings times.

Sample Determination Chilling and Heat Requirement of Some apricot cultivars (Prunusarmeniaca)

J. Hajilou; S. Toopchizadeh Tabrizian

Volume 39, Issue 1 , June 2016, , Pages 89-102

https://doi.org/10.22055/ppd.2016.12044

Abstract

Background and object One of the most important factors affecting the distribution of plants is physiological dormancy phenomenon. An apricot tree (Prunusarmeniaca) is one of the most ... Read More Background and object One of the most important factors affecting the distribution of plants is physiological dormancy phenomenon. An apricot tree (Prunusarmeniaca) is one of the most important horticultural crops in Iran, particularly Azerbaijan region. Apricot tree is an early- flowering and susceptible to chilling tree and due to early-flowering of this tree in planting and processing of this product, susceptibility to chilling injury during the flowering, is a limiting factor. Material and method To determine the heat and chilling requirement of flowering in four apricot cultivars (Tabarzeh, Asgaraabad, Shekarpareh, Shamloo) an experiment was carried out in Agricultural Research Stations “Khalaat Pooshan” in 2013-2014. Annual shoots with equal diameter and length were removed from trees and transferred weekly to the growth chamber. Sprouts status of phonological stages, and fresh and dry weights was examine dateachstage of sampling. To calculate the chilling requirements of cultivars several models were used. To estimate the heat requirement from, growth degree hours (GDH) model was used. Result Results showed hat in allmodels, Tabarzeh and Shamloo cultivars had the highest chilling requirement and Asgaraabad cultivar had the least chilling requirement. The amount of heat required, Cultivars of Tabarzeh and Shamloo with 3060 GDH had the least heat requirement and the Asgaraabad cultivar with 3254 GDH had highest heat requirement. Fresh and dry weight of buds before and after exposure to growth chamber showed significants difference at different sampling dates. Research of pro line changes in cultivars during dormancy proved that pro line amount at different sampling dates showed that significant difference between the cultivars and different sampling dates. Therefore, Tabarzeh cultivar had the least free pro line amount and the highest free pro line belonged to the Shamloo cultivar. Discussion Considering the cold weather of most of the Azerbaijan regions, selection and planting of apricot varieties with high chilling and heat requirement seems to be important. In this respect, knowledge of the chilling and heat requirement, selection of varieties and top genotype with high chilling and heat requirement to reduce the risk of late spring frosts increases production.

Effect of different temperatures on germination and pollen tube growth dynamics with different time of flowering in almond cultivars

S. Moosavi Nazhad; J. Hajilou; H. Rahnamoon

Volume 37, Issue 1 , June 2014, , Pages 49-58

Abstract

In this research , the effect various temperatures was studied on pollen tube dynamics in in vitro and controlled conditions ‘Nec Plus Ultra, ‘Sahand, and ‘Ferragnes, ... Read More

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Author = Hajilou, J.

Effect of Different Concentrations of Spermidine at Different Harvesting Times on the Quality of Apricot Fruits ”Shahroudi“ Cultivar

Abstract

Sample Determination Chilling and Heat Requirement of Some apricot cultivars (Prunusarmeniaca)

Abstract

Effect of different temperatures on germination and pollen tube growth dynamics with different time of flowering in almond cultivars

Abstract