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The Allelopathic effect of cogongrass (Imperata cylindrical L.) in growth of olive seedlings

دراسة التأثير الأليلوباثي للمستخلصات المائية و المسحوق الجاف لعشبة الحلفا Imperata cylindrica L. في نمو غراس الزيتون

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 Publication date 2018
  fields Life Science
and research's language is العربية
 Created by Shamra Editor




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This study was designed to estimate the allelophatic effect of cogongrass (Imperata cylindrica L.), in the growth of one year old of olive seedlings, in a nursery (greenhouse) conditions. Two experiments were conducted in this study. In the first experiment, the effect of the aqueous extracts of cognograss leaves, rhizomes, and roots, at concentrations of (2%, 4% and 8%) on the growth of olive seedlings (total length and diameter) were evaluated. The results of this experiment indicated an inhibitory effect of the 4% and 8% aqueous extracts on growth parameters. It was found that treatments with 4% and 8% aqueous extracts caused significant reduction (60.2% and 83%) respectively in the total length, in compare to the control. As for the 2% aqueous extract, it showed a stimulation effect in the growth, an increase about 31.5% was recorded for the total length in compare to the control. A similar result was observed in regard the seedlings diameter growth. The 2% aqueous extract showed an 56.8% increase in the rate of diameter growth, while the 4% and 8% extracts showed a reduction effects 80% and 91.5% respectively. The second experiment evaluated the effect of dried powder of cogongrass parts at concentrations of (2%, 4% and 8%) on the growth of olive seedlings.


Artificial intelligence review:
Research summary
تم إجراء هذه الدراسة لتحديد التأثير الأليلوبائي لعشبة الحلفا (Imperata cylindrica) على نمو غراس الزيتون (Olea europaea L.) بعمر سنة واحدة في ظروف المشتل. تضمنت الدراسة تجربتين: الأولى تناولت تأثير المستخلصات المائية لأوراق وجذور وريزومات الحلفا بتركيزات 2%، 4%، و8% على بعض مؤشرات نمو غراس الزيتون (الطول والقطر). أظهرت النتائج أن التركيزين 4% و8% من المستخلص المائي كان لهما تأثير مثبط على نمو الغراس، حيث انخفض معدل الطول بنسبة 60.2% و83% على التوالي مقارنة بالشاهد. بينما أظهر التركيز 2% تأثيرًا محفزًا للنمو، حيث زاد معدل النمو الطولي بنسبة 31.5% مقارنة بالشاهد. أما بالنسبة لمعدل نمو قطر الغراس، فقد كان متوافقًا مع معدل النمو الطولي، حيث زاد معدل نمو القطر بنسبة 56.8% عند التركيز 2%، بينما لوحظ تأثير مثبط عند التركيزين 4% و8%. في التجربة الثانية، تمت دراسة تأثير إضافة المسحوق الجاف لأوراق وجذور وريزومات الحلفا بتركيزات 2%، 4%، و8% إلى تربة أصص زراعة الغراس. أظهرت النتائج أن التركيزين 4% و8% من المسحوق الجاف كان لهما تأثير مثبط لنمو الغراس، حيث انخفض معدل الطول بنسبة 50.3% و80% على التوالي. بينما أظهر التركيز 2% تأثيرًا محفزًا للنمو بنسبة 23%. النتائج تشير إلى أن مستخلصات الحلفا المائية والمسحوق الجاف تحتوي على مواد كيميائية ذات تأثير أليلوبائي تفسر قدرتها التنافسية العالية مع المحاصيل الأخرى، ويزداد التأثير المثبط بزيادة التركيز.
Critical review
دراسة نقدية: تقدم هذه الدراسة نظرة شاملة على التأثير الأليلوبائي لعشبة الحلفا على نمو غراس الزيتون، مما يساهم في فهم أعمق للتفاعلات البيوكيميائية بين النباتات. ومع ذلك، هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الأفضل توسيع نطاق الدراسة لتشمل تأثيرات طويلة الأمد لهذه المستخلصات والمساحيق على نمو الزيتون. ثانيًا، لم يتم التطرق بشكل كافٍ إلى الآليات البيوكيميائية المحددة التي تؤدي إلى التأثيرات المثبطة أو المحفزة، مما يترك بعض الغموض حول كيفية عمل هذه المركبات الأليلوبائية. أخيرًا، كان من الممكن أن تكون الدراسة أكثر شمولية إذا تم تضمين تجارب ميدانية بجانب تجارب المشتل للحصول على نتائج أكثر واقعية.
Questions related to the research
  1. ما هو التأثير الأليلوبائي لعشبة الحلفا على نمو غراس الزيتون بتركيز 2%؟

    أظهر التركيز 2% من المستخلص المائي لعشبة الحلفا تأثيرًا محفزًا للنمو، حيث زاد معدل النمو الطولي بنسبة 31.5% وزاد معدل نمو القطر بنسبة 56.8% مقارنة بالشاهد.

  2. كيف يؤثر التركيز 4% و8% من المسحوق الجاف لعشبة الحلفا على نمو غراس الزيتون؟

    أظهر التركيزين 4% و8% من المسحوق الجاف لعشبة الحلفا تأثيرًا مثبطًا لنمو غراس الزيتون، حيث انخفض معدل الطول بنسبة 50.3% و80% على التوالي، وانخفض معدل نمو القطر بنسبة 62.7% و88% على التوالي.

  3. ما هي المركبات الكيميائية التي تفسر التأثير الأليلوبائي لعشبة الحلفا؟

    تحتوي مستخلصات الحلفا المائية والمسحوق الجاف على مركبات كيميائية مثل الفينولات والقلويدات التي تمتلك القدرة العالية على التثبيط ومنع النمو والإنبات.

  4. ما هي النقاط التي يمكن تحسينها في هذه الدراسة؟

    يمكن تحسين الدراسة بتوسيع نطاقها لتشمل تأثيرات طويلة الأمد، وتوضيح الآليات البيوكيميائية المحددة التي تؤدي إلى التأثيرات المثبطة أو المحفزة، وإجراء تجارب ميدانية بجانب تجارب المشتل للحصول على نتائج أكثر واقعية.


References used
ANJUM, T; BAJWA, R; JAVAID, B. Biological Control of Parthenium I: Effect of Imperata cylindrica on distribution, germination and seedling growth of Parthenium hysterophorus L. International Journal of Agriculture and biology. 7(3), 2005, 448-450
AVAV, T. Control of speargrass (Imperata cylindrica (L.) Raeuschel) with glyphosate and fluazifop-butyl for soybean ( Glycine max (L.) Merr) production in the savanna zone of Nigeria. Journal of the Science of Food and Agriculture. 80, 2000, 193-196
CERDERIA, A.L; CANTRELL, C.L; DAYAN, F.E BYRD, J.D; DUKE, S.O. Tabanone, a new phytotoxic constituent of cogongrass (Imperata cylindrica). Weed Sci. 60, 2012. 212–218
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