The Effects of Elevated CO2 on the Growth and Water Conservation Potentials of Medicago Sativa L. And Chloris Gayana K.

الموضوعات

علوم بيئية

الملخص

Atmospheric carbon dioxide (CO 2 ) concentrations have been increasing for many decades. The impact of such greenhouse gas has been reported to affect ecosystems at all levels. Elevated atmospheric CO 2 can affect the growth of plants and their response to water intake. But, different plants show different degrees of response depending on whether they have C 3 or C 4 photosynthetic pathway. The aim of this study is to evaluate the effect of CO 2 enrichment on the growth and microbial activity of alfalfa (Medicago sativa) and Rhodes grass (Chloris gayana) and also its effect on the water use efficiency (WUE) of these plants. Both plant species were exposed to ambient CO 2 (ACO 2 ; ~500 ppm), enriched CO 2 (ECO 2 ; ~ 1000 ppm) under regular watering regime or under water stress. Soil samples were tested for microbial activity using Fluorescein diacetate (FDA) hydrolysis technique, shoot and root lengths were measured periodically, WUE was calculated using fresh and dry weight of the plants, and numbers of leaves were counted. Microbial activity under elevated CO 2 was 41 % higher in Rhodes grass at water stress, than in ambient CO2 Also, by inducing water stress on Rhodes grass, the WUE increased significantly by 4.6 times i.e. 21.5% than its control counter parts. Moreover, WUE of alfalfa in the treatment (elevated CO 2 + water stressed) group was 25.7% (3.8 times) greater than alfalfa grown at control (ambient CO 2 + normal water). Fresh weight biomass of Rhodes grass under treatment group showed no significant difference compared to the control group, whereas the biomass of alfalfa was significantly higher in both fresh (4%) and dry matter (11 .3%) under treatment group, compared to the control group. Height of alfalfa grown under CO 2 enrichment was 30% lesser at water stress, than compared to the ones grown at normal water conditions. Shoot/root ratio of Rhodes grass grown under elevated CO 2 was 28.8% lower than the ones grown at ambient CO 2 concentrations, whereas shoot/root ratio of alfalfa grown under CO 2 enrichment was 22.9% higher than the ones grown at ambient CO 2 concentrations. Number of leaves remained the same for both Rhodes grass and alfalfa under every treatment.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0ead8d59-6fd5-498a-ac93-e60ed5e4db49

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

7055_1.pdf

بيانات النشر

ترجمة العنوان

تأثير زيادة تركيز غاز ثاني اكسيد الكربون على نمو نبات البرسيم والرودس وعلى القدرة المثلى على استخدام الماء

ألقاب المؤلفين

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اللغة

English

المصدر والدورية

اسم المصدر

The Effects of Elevated CO2 on the Growth and Water Conservation Potentials of Medicago Sativa L. And Chloris Gayana K.

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Taouflk KSlksl

الإعداد

أسماء خان أحمداني

الاقتباسات الببليوغرافية