Search or add a thesis

Advanced Search (Beta)
Home > Postharvest Fruit Softening and Quality Management of Peach

Postharvest Fruit Softening and Quality Management of Peach

Thesis Info

Access Option

External Link

Author

Ullah, Sami

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Subject

Agricultural Technology

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1087

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726973360

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


Peach being climacteric fruit ripe quickly after harvest and exhibit fast ripening at ambient conditions. Rapid postharvest fruit softening and quality deterioration limit its postharvest storage life. Therefore, this integrated study was carried out to understand the role of various factors, such as cultivars, harvest locations and application of pre-storage chemicals including salicylic acid (SA), oxalic acid (OA), putrescine (PUT) and CaCl2 to manage postharvest fruit softening and quality of peach. The degree of fruit softening was measured by determining the activities of fruit softening enzymes including pectin esterase (PE), endo-1-4-β glucanase (EGase), endo- polygalacturonase (endo-PG) and exo-polygalacturonase (exo-PG). Fruit quality parameters including activities of antioxidative enzymes [superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD)], total phenolic contents (TPC) and antioxidants scavenging activity (ASA), soluble solid contents (SSC), titratable acidity (TA), SSC: TA ratio and ascorbic acid contents were also determined during ripening and cold storage periods (35-days with 7-days interval). In the first study, the effects of cultivars and harvest locations on postharvest fruit softening and quality were evaluated. It was found that peach cv. ‘Flordaking’ exhibited reduced fruit softening and better fruit quality, as compared to cv. ‘Early Grand’ during cold storage (0±1°C and 80-85% RH) and under ambient conditions (25±2°C and 60-65% RH). Moreover, it was found that peach fruit harvested from Soan Valley, district Khushab revealed reduced fruit softening and activities of fruit softening enzymes with better fruit quality than fruit from Sillanwali, district Sargodha. Irrespective to peach cultivars and harvest locations, peach fruit exhibited full ripening (eating soft stage) on day-4 at ambient conditions. From this study, peach cv. ‘Flordaking’ harvested from Soan Valley were screened and selected for further trials. Among applications of different pre- storage chemicals, 1st trial was conducted regarding effects of SA (0, 2, 4 or 6 mM) on fruit softening and quality of ‘Flordaking’ peach fruit during ripening, under cold storage and at ripening following cold storage. Application of 6 mM SA significantly reduced the ethylene production and maintained higher fruit firmness during ripening and under cold storage conditions. Activities of fruit softening enzymes viz. PE, EGase, endo-PG and exo-PG were significantly reduced by application of SA in a concentration dependent manner. Peach fruit treated with higher concentrations of SA (6 mM) revealed relatively higher TPC, ASA, activities of antioxidative enzymes (SOD, POD and CAT) than untreated fruit. Moreover, peach fruit treated with 6 mM SA exhibited lower SSC: TA ratio, as compared to untreated fruit. The 2nd trial was carried out to check the effects of different concentrations of OA (0, 1, 2 or 3 mM) on fruit softening and quality of ‘Flordaking’ peach during ripening, under cold storage and at ripening followed by cold storage. Peach fruit treated with 3 mM OA showed reduced ethylene production, respiration rate and fruit softening. Reduction in fruit softening was associated with reduced activities of fruit softening enzymes (PE, EGase, endo-PG and exo-PG) in OA-treated fruit. Application of 3 mM OA significantly enhanced the TPC, ASA and activities of antioxidative enzymes viz. SOD, POD, CAT. During 3rd trial, effects of postharvest application of PUT (0, 0.5, 1 or 2 mM) were investigated on fruit softening and quality of ‘Flordaking’ peach during ripening, under cold storage and at ripening followed by cold storage. Application of 2 mM PUT significantly delayed ethylene production, reduced respiration rate and retained firm fruit, as compared to untreated fruit. PUT-treated (2mM) fruit exhibited reduced activities of fruit softening enzymes (PE, EGase, endo- PG and exo-PG). Moreover, low SSC: TA ratio, higher ascorbic acid contents, enhanced TPC, ASA and activities of antioxidative enzymes (SOD, POD and CAT) were exhibited by 2 mM PU- treated fruit. The 4th trial was carried out to study the effects of postharvest application of different concentrations of CaCl2 (0, 2, 4 or 6%) on fruit softening and quality of ‘Flordaking’ peach during ripening, under cold storage and at ripening followed by cold storage. CaCl2-treated fruit, at higher concentration (6% CaCl2) revealed reduced ethylene production and respiration rate. Application of 6% CaCl2 reduced fruit softening and activities of fruit softening enzymes including PE, EGase, endo-PG and exo-PG, in peach fruit. Higher TPC, ASA and activities of antioxidative enzymes (SOD, POD and CAT) were exhibited by 6% CaCl2-treated fruit. Although, the higher dose of CaCl2 (6%) was most effective in reducing fruit softening and improving quality of peach fruit but it caused toxicity symptoms on peach fruit. From above pre-storage trials best doses of different chemicals (6 mM SA, 3 mM OA, 2 mM PUT and 4% CaCl2) were screened and these were confirmed in another study. In confirmatory trial, it was found that among all tested anti-ripening chemicals, application of 2 mM PUT was more effective in reducing ethylene production, respiration rate and retaining higher fruit firmness. However, the activities of fruit softening enzymes were significantly suppressed by 4% CaCl2 treatment. In conclusion, application of 6 mM SA, 3 mM OA, 2 mM PUT or 4% CaCl2 were found beneficial to reduce fruit softening and activities of fruit softening enzymes, enhance antioxidative enzymes and retain better fruit quality of ‘Flordaking’ peach fruit upto 35-days of cold storage.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

جنم دن

جنم دن

میں یہ بات کسے بتائوں ؟

’’آج جنم دن ہے میرا‘‘

یعنی !یہ بتائوں

آج بھی تنہا ہوں میں

Analisis Nikah Siri Dalam Perspektif Psikologi Dan Sosiologi Hukum Keluarga Islam

Penelitian ini merupakan sebuah analisis mendalam terhadap fenomena pernikahan siri dalam konteks hukum keluarga Islam, dengan pendekatan psikologi dan sosiologi. Pernikahan siri, meskipun secara hukum kerap dianggap kontroversial, tetap menjadi praktik yang signifikan dalam masyarakat yang menganut Islam. Penelitian ini bertujuan untuk memahami faktor-faktor psikologis dan sosial yang memengaruhi keputusan individu untuk melakukan pernikahan siri, serta dampaknya terhadap struktur keluarga dan masyarakat secara lebih luas. Dalam analisis psikologis, penelitian ini akan menggali motivasi dan faktor-faktor emosional yang mendorong individu untuk memilih pernikahan siri sebagai alternatif dalam memenuhi kebutuhan mereka dalam konteks hubungan intim. Sementara dalam analisis sosiologis, penelitian ini akan memeriksa dampak sosial dan normatif dari pernikahan siri terhadap struktur sosial masyarakat Islam, termasuk bagaimana hal ini memengaruhi status perempuan dan anak-anak dalam keluarga dan masyarakat.Hasil penelitian ini diharapkan akan memberikan wawasan yang lebih baik tentang fenomena pernikahan siri dalam masyarakat Islam, serta menyediakan dasar bagi perubahan dan penyempurnaan hukum keluarga Islam yang relevan dengan realitas sosial dan psikologis yang berkembang. Penelitian ini juga dapat menjadi acuan untuk pemahaman yang lebih baik tentang bagaimana praktik pernikahan siri dapat diintegrasikan atau diatur lebih baik dalam kerangka hukum dan norma-norma sosial yang ada.

Impact of Target Model on Achievement Goal Orientation of Secondary School Students in the Subject of Mathematics

The major purpose of the study was to identify the impact of teachers'' instructional practices, delineated in TARGET Model, on achievement goal orientation of secondary school students in the subject of mathematics. In order to develop the rationale of the study, a survey was done to identify the relationship between mathematics teachers'' instructional practices and achievement goal orientations of students at secondary school level. Afterward an experiment was devised to endorse mastery-approach goal orientation among secondary school students through instructional practices prescribed in TARGET model. To assess the impact of these instructional practices on achievement goal orientations of students, a follow up test was administered after six months of the endorsement and sustainability of endorsed orientations was assessed. The target population of the study was secondary school students enrolled in government schools in the province of the Punjab. The sample of the survey comprised 874 students (Boys = 428, Girls = 446) of class 9th, which was selected through multistage stratified sampling technique from nine districts of the Punjab on the basis of education deprivation indices of these districts. Sample of the experiment comprised one whole randomly selected section of class 9th, science group containing 48 students. Two matched groups (control and experimental) each consisting 24 students, were made on the basis of students'' scores in pre-test. Sample of the follow up test, to assess the impact of the treatment, comprised the students of experimental group only. A questionnaire “Achievement Goal Orientations and Perceptions about Teachers'' Instructional Practices Questionnaire (AGOPTIPQ)” was used to collect data for the survey. The questionnaire consisted of two sets of questions: one set to measure students'' achievement goal orientations "Achievement Goal Orientation Questionnaire AGOQ)" and the other one to know students'' perceptions about instructional practices (related to six factors of TARGET vi model) of their mathematics teachers "Perceptions about Teachers'' Instructional Practices Questionnaire (PTIPQ)". AGOQ was used for pre-test, post-test and follow-up test. For experimental group the treatment comprised lesson plans of seven chapters of mathematics text book for class 9th for a period of thirteen weeks (one term). All the aspects of TARGET Model (Task, Authority, Recognition, Grouping, Evaluation and Time) were addressed in lesson plans to make mastery goal endorsing classroom environment. Lesson plans were validated by two mathematics teachers. A Mathematics Achievement Test (Containing 70 MCQs) of taught units was used to measure the effect of treatment on students'' achievement in the subject of mathematics. A pilot study was conducted to validate the instruments. Reliability indices (Cronbach Alpha) of the questionnaires PTIP and AGOQ were 0.844 and 0.76 respectively, which are statistically significant. Confirmatory Factor Analysis was done to assess the factor loading of the statements. The reliability index of the final mathematics achievement test was 0.87 (Cronbach Alpha). Analysis of the data showed that at secondary level students had greater performanceapproach goal orientation mean score (M = 2.40, SD = 0.65), than they had masteryapproach goal orientation mean score (M = 2.26, SD = 0.62). Analysis also revealed that teachers'' instructional practices were more performance-approach goal endorsing than masterapproach goal orientation. Analysis also showed that AGOs of students were significantly correlated (r = 0.249) with instructional practices (described in TARGET model) of mathematic teachers. Analysis of experimental data showed that treatment made a significant difference in mastery-approach goal orientation of students. Mean gain scores of control group (M = .35, SD = .58) and experiment group (M = -.98, SD = .94), t(46) = -5.94, p <.05, were statistically significantly different. Difference between mean gain scores of control and experimental groups for other three goal orientations were not statistically significant. Results also showed that treatment enhanced the achievement level of experimental group in mathematics. The difference between mean achievement scores of experimental (M = 77.92, vii SD = 7.29) and control group (M = 69.33, SD = 9.79) were statistically significant. Analysis revealed that there was no statistically significant difference between mean scores of students of experimental group in post-test (M = 3.71) and follow up test (M = 3.58) on masteryapproach goal orientation t (23) = -0.81, p = .426. It showed that endorsed mastery-approach goal orientation remained stable after six months of treatment. The results of the study were linked with previously conducted research in the field of achievement goal orientation. Recommendations were made on the basis of findings of the study. The findings revealed that TARGET model is effective to endorse mastery approach goal orientation among students. It is, therefore, recommended that teachers should use masteryapproach goal endorsing instructional practices to make students mastery-approach goal oriented. Results proved that instructional practices prescribed in TARGET model also improved students'' achievement in the subject of mathematics. Results of the Board of Intermediate and Secondary Schools show that students are performing poorly in the subject of mathematics. It is therefore recommended to arrange workshops, seminars and teacher training programs to make teachers aware of mastery goal structure of instructional practices delineated in TARGET model. It will make students more mastery-approach goal oriented which will, ultimately, improve their performance in mathematics.