أجريت هذه الدراسة لاختبار مدى تأثير مستخلصات أوراق وبذور نبات العرعر الكحولي والمائي على البارد ضد نوعين من البكتريا الممرضة للنبات هما بكتريا Erwinia carotovora وبكتريا Agrobacterium tumfaceins ونوعين من البكتريا الممرضة للإنسان والحيوان هما بكتريا Escherichia coli وبكتريا Staphylococcus aureus وقد أبدت جميع المستخلصات تأثيرا تثبيطيا واضحا ضد نمو جميع أنواع بكتريا الاختبار حيث كان أعلى تأثير مثبط للمستخلصات عند تركيز 150 مليليتر وسجلت أعلى النتائج لمستخلص الايثانول لأوراق نبات العرعر ضد بكتريا Erwinia carotovora إذ بلغ قطر منطقة التثبيط (25.4) ملم في حين كان قطر منطقة التثبيط لمستخلص الايثانول لبذور نبات العرعر لنفس البكتريا هو (20.4) ملم حيث أظهرت الدراسة أن مستخلصات أوراق نبات العرعر أفضل من مستخلصات بذور نبات العرعر، كما بينت الدراسة بان تأثير مستخلصات نبات العرعر كانت أفضل من تأثير المضادات الحيوية وبذلك فان هذه الدراسة قد أوضحت أنه بالإمكان استخدام مستخلصات نبات العرعر كبدائل دوائية منخفضة التكلفة وخاليه من التأثيرات الجانبية.
Progressive reduction of water supply was imposed during early period (S1) and late period (S2) interceded by a recovery, with a moderate stress for first case and un intensive stress for second case, at fruiting stage of tomato (Lycopersicon esculentum Mill. cv. Rio Grand). The influence of this reduction on fruit production, shoot growth, water content (WC), relative water content (RWC), leaf area (LA), specific leaf weight (SLW), total soluble solids of fruit (T.S.S.) and maturity percentage of fruit were investigated. Repetition of water stress (S1+S2) was obviously reducing the shoot growth, fresh yield, WC, LA and maturity percentage, whereas that was not achieved in dry weight of fruits (FDW), RWC, SLW and T.S.S. Since, a significant difference was founded between the effects of S2 cycle and when that has been preceded by another one S1+S2 on accumulation of dry matter of fruit. Two successive cycles of water stress were doubled of FDW by two times of that registered in control. These results indicate that, during fruiting stage, the effect of gradually exposure of a moderate water stress period, followed by recovery, thereafter by another gradually exposure of un intensive water stress period, contributed to better accumulation of dry matter in fruit by an osmotic adjusting therefore improving water use efficiency, compared to the effect of only one high intensive of water stress applied during the second period. Repetition cycle of water stress may be useful to develop management systems for a reasonable production of tomato and thus reducing the needs of irrigation water in regions facing deficit of water supplies.
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