منصة إيفاد العلمية

مجدى عبدالوهاب عبدالفتاح عمر

إرسال رسالة

التخصص: فسيولوجى نبات

الجامعة: جامعة الأزهر

النقاط:

معامل الإنتاج البحثي

الخبرات العلمية

تحليل النتائج وإجراء وتحكيم الأبحاث
١
محاضر
العمل فى زراعة الأنسجة والخلايا النباتية وإجراء بعض القياسات الفسيولوجية والكيميائية

الأبحاث المنشورة

The effect of some factors on stimulating the growth and production of active substances in Zingiber officinale callus cultures

المجلة: Annals of Agricultural Sciences

سنة النشر: 2015

تاريخ النشر: 2015-02-08

Ginger (Zingiber officinale Roscoe) is one of the most widely used herbs that contains several interesting bioactive constituents and possesses health promoting properties. [6]-Gingerol, a major pungent ingredient of ginger also has great potent antioxidant activity. Callus cultures of ginger were induced from shoot tip segments of auxiliary buds taken from in vitro growing rhizomes. Of different auxins tested in MS medium contents, 2,4-D was the most effective in inducing and maintaining callus cultures. BA was most effective in maintaining callus culture compared to kinetin (Kin). Also, the effect of some factors as precursors and biotic elicitors on callus growth and production of active substances were investigated. Mevalonic acid (MVA) at concentration of 1, 5 and 10 mg/l, Phenylalanine (Phe), Leucine (Leu) and Valine (Val) at 50, 100 and 150 mg/l, yeast extract (YE) and Aspergillus niger (AS) at 250, 500 and 750 mg/l showed negative effect on both callus fresh weight (FW) and callus dry weight (DW) compared to control. In the present study, it was observed that 6-gingerol production is positively influenced by the addition of MVA followed by YE in callus culture. While, the other levels of precursors and biotic elicitors did not succeed in producing either of 8-gingerol, 10-gingerol or 6-shogaol.

EFFECT OF SOME GROWTH SUBSTANCES ON ROOTING AND ENDOGENOUS HORMONES OF Casimiroa edulis L. CUTTINGS

المجلة: Zagazig Journal of Agricultural Research

سنة النشر: 2018

تاريخ النشر: 2018-05-03

؟

المجلة: ؟

سنة النشر: 2015

تاريخ النشر: 2015-02-08

؟

المجلة: ؟

سنة النشر: 2015

تاريخ النشر: 2015-02-08

؟

المجلة: ؟

سنة النشر: 0

تاريخ النشر: 2024-07-30

Effect of Salt Stress and Foliar Application of Salicylic Acid on Morphological, Biochemical, Anatomical, and Productivity Characteristics of Cowpea (Vigna unguiculata L.) Plants

المجلة: Plants

سنة النشر: 2021

تاريخ النشر: 2021-12-31

The present study aimed to investigate the impact of salinity on vegetative growth, chemical constituents, and yields of cowpeas (Vigna unguiculata) and the possible benefits of salicylic acid (SA) on these plants after damage from salinity. To achieve these objectives, two pot experiments were carried out at the Faculty of Agriculture, Al-Azhar University, Egypt, during the two growing seasons of 2019 and 2020. The results revealed that salinity significantly decreased, and SA treatment substantially increased the plant height, number of compound leaves, number of internodes per plant, fresh weights of leaves and stems, productivity, photosynthetic pigments content, and concentrations of nitrogen (N), phosphorus (P), and potassium (K) of the cowpea plants compared with the control. The anatomical structure of stems and leaves of the plants were also investigated, and it was found that positive variations in the anatomical structure of the median portion of the main stems and blades of mature foliage leaves were detected in the stressed and SA-treated plants. In conclusion, SA treatment increased the salt stress tolerance of cowpea plants by improving the morphological and physiological attributes of the plants.

Effects of Fogging System and Nitric Oxide on Growth and Yield of 'Naomi' Mango Trees Exposed to Frost Stress

المجلة: Life

سنة النشر: 2023

تاريخ النشر: 2023-06-13

In years with unfavorable weather, winter frost during the blossoming season can play a significant role in reducing fruit yield and impacting the profitability of cultivation. The mango Naomi cultivar Mangifera indica L. has a low canopy that is severely affected by the effects of frost stress. As a result of the canopy being exposed to physiological problems, vegetative development is significantly inhibited. The current investigation aimed to study the influence of spraying nitric oxide and fogging spray systems on Naomi mango trees grafted on 'Succary' rootstock under frost stress conditions. The treatments were as follows: nitric oxide (NO) 50 and 100 µM, fogging spray system, and control. In comparison to the control, the use of nitric oxide and a fogging system significantly improved the leaf area, photosynthesis pigments of the leaf, the membrane stability index, yield, and physical and chemical characteristics of the Naomi mango cultivar. For instance, the application of 50 µM NO, 100 µM NO, and the fogging spray system resulted in an increase in yield by 41.32, 106.12, and 121.43% during the 2020 season, and by 39.37, 101.30, and 124.68% during the 2021 season compared to the control, respectively. The fogging spray system and highest level of NO decreased electrolyte leakage, proline content, total phenolic content, catalase (CAT), peroxidases (POX), and polyphenol oxidase (PPO) enzyme activities in leaves. Furthermore, the number of damaged leaves per shoot was significantly reduced after the application of fogging spray systems and nitric oxide in comparison to the control. Regarding vegetative growth, our results indicated that the fogging spray system and spraying nitric oxide at 100 µM enhanced the leaf surface area compared to the control and other treatments. A similar trend was noticed regarding yield and fruit quality, whereas the best values were obtained when the fogging spray system using nitric oxide was sprayed at a concentration of 100 µM. The application of fogging spray systems and nitric oxide can improve the production and fruit quality of Naomi mango trees by reducing the effects of adverse frost stress conditions.

Utilization of jojoba oil and salicylic acid as postharvest treatment on storability and fruit quality of ‘Late Swelling’ peach cultivar

المجلة: Notulae Botanicae Horti Agrobotanici Cluj-Napoca

سنة النشر: 2023

تاريخ النشر: 2023-06-02

The ‘Late-Swelling’ peach is an important cultivar due to its attributes of fruit quality, such as handling ability and late harvest season. Peaches rapidly deteriorate during storage, which shortens their shelf-life. The preservation of quality traits of ‘Late-Swelling’ peach during handling and storage investigated. Fruits harvested in the early ripe stage (last week of June) were either dipped in jojoba oil (JO) 500, 1000, and 1500 ppm and salicylic acid (SA) 100, 200, and 300 ppm, then stored at 5+1 °C and 85% RH for 35 days besides 7 days as shelf-life the fruits were examined every 7 days until the end of the experiment. Positive influences were observed for JO and SA on the different chemical and physical characteristics of the peach fruits under study especially those related to storability and fruit quality. All fruits treated with JO 1500 and 1000 ppm, and SA 300 ppm maintained the fruit firmness, hº, total acidity, and ascorbic acid over the whole storage period, in addition to the lowest decay and weight loss, as well as maintaining the fruit sensory quality and decreased peroxidase [PPO] activity while increasing polyphenol oxidase [POD], catalase [CAT], and ascorbate peroxidase [APX] activities compared with the control at the end of shelf-life period. In conclusion, our results suggest using JO and SA to enhance and prolong the storability of peach fruits at 5+1 °C and 85% RH.