تاثير بعض معاملات السيطرة الطبيعية قبل الحصاد وبعده في تحسين الصفات النوعية والقابلية الخزنية لثمار نخيل التمر Phoenix dactylifera L. صنفي البرحي والبريم == EFFECT some pre and post - harvest natural control treatments on improving the qualitative characteristics and storage ability of date palm fruits (Phoenix dactylifera L. ) cvs. Barhi and Bream
Author name:
حمزة عباس حمزة عباس
Supervisor name:
عباس مهدي جاسم | ضياء احمد طعين
General topic:
Agricultural sciences
Specific topic:
Plant - Gardening
Degree:
Doctorate
University:
University Of Basrah - Faculty Of Agriculture
Language:
Arabic
University location:
Basrah
First pages:
31T1782 - p.pdf
Abstract:
Research were divided into two experiments, field and storage , field experiment was conducted in private orchard at Abu - Alkhasib south of Basrah . Date palm fruits( Phoenix dactylifera L.) cvs. Barhi and Bream were used during the growing seasons 2014 and 2015. The aim of the study was to investigate the effect of spraying chitosan at the concentrations of 0% , 1% , 2% on yield and some physical , chemical and physiological characteristics of fruits. The experiment included 9 trees for both cvs. Complete Randomized Block Design was used with three replicates . The results were analyzed by the analysis of variance of factorial experiment and mean values were compared using the Revised Least Significant Difference Test at 0.05 probability level. The results of study showed significant effect of spraying chitosan at the concentrations of 2% on the most of the studied parameters (fresh weight , size of fruit , yield , water content, total acidity ,tannin and pectin) in addition to delay the ripening and respiration rate of fruits for both cvs. Untreated fruits retain the highest percentage of total soluble solids , total sugars , reducing sugars and total protein. Invertase and cellulase activities decreased in fruits treated with chitosan as compared with untreated fruits which recorded the highest activity of invertase and cellulase for both cvs.Storage experiment was conducted in Al - Moussawi dates factory situated at Abu - Al - Khaseb District , Basrah Governorate to study the effect of some pre and post harvest natural control treatments in improving the qualitative characteristics and storage ability of date palm fruits cvs. Barhi and Bream. Fruits that treated with chitosan at the concentrations of (0, 1, 2) % were harvested in the early morning and carried to Al - Moussawi dates factory. Then every one of the three parts divided into five groups ,the first was treated with ultraviolet light (UV) at the concentration of 1KGY for periods of (0, 5, 10) minutes ,while the second group were treated with (1 - MCP) at the concentration of ( 0,0.5,1) ppm for 24 hour at 0 ºc .third was treated with ozone (O3) at the concentration of 5 ppm for the periods of (0, 0.5, 1) hour ,while the fourth group were soaked in chitosan at the concentrations of ( 0,1,2) % , the fifth were without treatment .Fruits were packed in plastic bags.Both of the two parts were stored at two storage temperatures (room temperature 25±2ºc and freezing temperature - 10±2ºc for three weeks and six months respectively . Storage characteristics were studied before andBduring storage and at the end of storage period . the results can be summarized as follow : 1 - spraying chitosan at the concentrations of 2% in the field reduced the percentage of deteriorated fruit , ripening process, TSS , total and reducing sugars and increased the percentage of water content, sucrose and total acidity in addition to elongation the desirable color of fruits and keeping good flavor and taste for Barhi and Bream fruits until the end of storage period at - 10±2ºc and 25±2ºc for the both of growing seasons 2014 and 2015 .2 - Treating with ultraviolet light (UV) for 5 minutes reduced percentage of decay for Barhi ,whereas fuel west percentage of Bream fruits decay was in fruits treated wish ozone for 1hour for both growing seasons .3 - Treating with (1 - MCP) at the concentration of (1) ppm reduced the progress of ripening and total sugars and increased water content, sucrose and total acidity in addition to elongation the desirable color of fruits and keeping good flavor and taste for Barhi and Bream fruits up to the end of storage period at - 10±2ºc for the both of growing seasons .4 - The percentage of decay of fruits , ripening progress, loss in weight , TSS , total and reducing sugars increased whereas the percentage of water contents, sucrose and acidity decreased with increment of storage period for both cultivars and seasons at 25±2ºc and - 10±2ºc.5 - The interaction between field treatments and storage treatments had significant effect on percentage of fruits decay. Fruits sprayed with chitosan at the concentrations of 2% in the field and treated with ultraviolet light (UV) for the periods of 10 minutes had the lowest percentage of fruits decay for both growing seasons .6 - The interaction between spraying chitosan and storage period significantly effected on studied parameters . Fruits sprayed with 2% chitosan in the field were superior in keeping water content and delaying ripening process but they had the lowest TSS , total and reducing sugar at the end of storage period at 25±2ºc and - 10±2ºc compared with untreated fruit for both cultivars and seasons .7 - The interaction between storage treatments and storage period significantly effected on studied parameters. Fruits treated with (1 - MCP) at the concentration of (1) ppm were the best in keeping water content and delaying ripening process but they had the lowest TSS , total and reducing sugar at the end of storage period at 25±2ºc and - 10±2ºc compared with untreated fruit for both cultivars and seasons .C8 - The interaction among field treatments, storage treatments and storage period had significant effect on percentage of fruits decay. Fruits sprayed with chitosan at the concentrations of 2% in the field and treated with ultraviolet light (UV) for the periods of 10 minutes had the lowest percentage of fruits decay , at the end of storage period at - 10±2ºc for both cultivars and seasons .9 - Gel electrophoresis for protein showed that in Barhi and Bream fruits treated with pre and post harvest natural control treatments and stored at - 10±2ºc , the process of gene expression has occurred , since there was a number of bands , which differed both in number as well in their position on the gel , depending on treatments and cultivar . There was very clear differences between treatments in the number , position and the timing of the appearance of the protein bands for both cvs. during which Bream fruits treated with chitosan recorded the highest number of bands ( seven bands).
