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008			260218s2025 ua a|||frm||| 000 0 eng d
040			_aEG-GICUC _beng _cEG-GICUC _dEG-GICUC _erda
041	0		_aeng _beng _bara
049			_aDeposit
082	0	4	_a635
092			_a635 _221
097			_aM.Sc
099			_aCai01.07.14.M.Sc.2025.Mo.E
100	0		_aMohamed Sayed Mohamed Nageh Ali, _epreparation.
245	1	4	_aThe effect of elevated concentration of soil carbon dioxide with partial root zone drying on the growth rate, yield, water productivity, and fruit quality of cucumber under greenhouse conditions / _cby Mohamed Sayed Mohamed Nageh Ali ; Supervisors Dr. Hassan Ali Hassan, Dr. Emad Abdelhameed Abdeldaym, Dr. Mohamed EL-Sayed Abuarab.
246	1	5	_aتأثير زيادة تركيز ثاني أكسيد الكربون في التربة مع التجفيف الجزئي لمنطقة الجذر على معدل النمو، المحصول، إنتاجية المياه، وجودة ثمار الخيار تحت ظروف مناخ الصوبات الزراعية
264		0	_c2025.
300			_a130 pages : _billustrations ; _c25 cm. + _eCD.
336			_atext _2rda content
337			_aUnmediated _2rdamedia
338			_avolume _2rdacarrier
502			_aThesis (M.Sc)-Cairo University, 2025.
504			_aBibliography: pages 110-130.
520		3	_aWater scarcity and soil carbon dioxide elevation in arid regions are considered the most serious factors affecting crop growth and productivity. This study aimed to investigate the impacts of elevated CO2 levels (eCO2 at rates of 700 and 1000 ppm) on agro-physiological attributes to induce drought tolerance in cucumbers by activating the expression of genes related to aquaporin and stress response, which improved the yield of cucumber under two levels of irrigation water conditions [75% and 100% crop evapotranspiration (ETc)]. Therefore, two field experiments were conducted in a greenhouse with controlled internal climate conditions, at the Mohamed Naguib sector of the national company for protected agriculture, during the winter seasons of 2021-2022 and 2022-2023. The treatments included eCO2 in soil under normal and partial root zoon drying (PRD, 100% ETc Full irrigations, and 75% ETc). All the applied treatments were organized as a randomized complete block design (RCBD) and each treatment was replicated six times. Untreated plants were designed as control treatment (CO2 concentration was 400 ppm). The results of this study showed: that elevating CO2 at 700 and 1000 ppm in soil significantly increased plant growth parameters, photosynthesis measurements, and phytohormones [indole acetic acid (IAA) and gibberellic acid (GA3)], under partial root-zone drying (75% ETc) and full irrigation conditions (100% ETc). Under PRD condition, eCO2 at 700 ppm significantly improved plant height (13.68%), number of shoots (19.88%), Leaf greenness index (SPAD value, 16.60%), root length (24.88%), fresh weight (64.77%) and dry weight (61.25%) of cucumber plant, when compared to untreated plants. The pervious treatment also increased photosynthesis rate, stomatal conductance, and intercellular CO2 concentration by 50.65%, 15.30% and 12.18%; respectively, compared to the control treatment. Similar findings were observed in nutrient concentration, carbohydrate content, Proline, total antioxidants in the leaf, and nutrients. In contrast, eCO2 at 700 ppm in the soil reduced the values of transpiration rate (6.33%) and Abscisic acid (ABA, 34.03%) content in cucumber leaves compared to untreated plants under both water levels. Furthermore, the results revealed that the gene transcript levels of the aquaporin-related genes (CsPIP1-2 and CsTIP4) significantly increased compared with a well-watered condition. The transcript levels of CsPIP improved the contribution rate of cell water transportation (intermediated by aquaporin's genes) and root or leaf hydraulic conductivity. The quantitative real-time PCR expression results revealed the upregulation of CsAGO1 stress-response genes in plants exposed to 700 ppm CO2. In conclusion, elevating CO2 at 700 ppm in the soil might be a promising technique to enhance the growth and productivity of cucumber plants in addition to alleviating the adverse effects of drought stresses.
520		3	_aأجريت تجربتان في صوب متحكم بالظروف بالمناخية الداخلية خلال فصل الشتاء لعامي 2022 و2023. لدراسة تأثير حقن التربة بتركيزات مختلفة لثاني أكسيد الكربون (0، 700 و1000) تحت مستويات ري مختلفة [0، 75% و 100 % بخر نتح للمحصول (ETc) ]. أظهرت النتائج التي تم الحصول عليها أن زيادة تركيز ثاني أكسيد الكربون إلى 700 او 1000 جزء في المليون إلى زيادة معنوية في قياسات نمو النباتات، قياسات التمثيل الضوئي، ومستوى الهرمونات النباتية وكمية محصول للخيار في مستوى الري 75% و100% بخر نتح للمحصول مقارنة بمعاملة الكنترول (CT) في كلا الموسمين.
530			_aIssues also as CD.
546			_aText in English and abstract in Arabic & English.
650		0	_aVegetable
650		0	_aالخضر
653		1	_aWater shortage _aplant performance _aelevated CO2 levels _agene regulation _aphysiological responses _aCucumis sativus _aنقص المياه _aأداء نمو النباتات
700	0		_aHassan Ali Hassan _ethesis advisor.
700	0		_aEmad Abdelhameed Abdeldaym _ethesis advisor.
700	0		_aMohamed EL-Sayed Abuarab _ethesis advisor.
900			_b01-01-2025 _cHassan Ali Hassan _cEmad Abdelhameed Abdeldaym _cMohamed EL-Sayed Abuarab _dMohamed Imam Ragab _dMohamed Abdel Wahab Mahmoud _UCairo University _FFaculty of Agriculture _DDepartment of Vegetable Crops
905			_aShimaa _eEman Ghareb
942			_2ddc _cTH _e21 _n0
999			_c178591