Abstract
The present study aims to assess inter-specific competition between Hydrilla verticillata and Ceratophyllum demersum. A competition experiment design has five treatment combinations to terminal shoots of C. demersum only, terminal shoots of H. verticillata only and three different treatment combinations of C. demersum and H. verticillata together. Our results showed parameters growth of C. demersum were decreased of which, total chlorophyll, protein, and biomass while Superoxide dismutase (SOD), and Catalase (CAT) enzymes increase were significantly (p<0.05) compare with control treatment. While H. verticillata were increased total chlorophyll, biomass, CAT and little increase in protein and SOD were significantly (p<0.05) compare with control treatment. Therefore, due to the competition, with the introduction of C. demersum, the performances growth of H. verticillata were increased. Based on our result, showed H. verticillata and C. demersum species were coexist, C. demersum will have a competitive advantage over H. verticillata. Therefore, this study suggests, H. verticillata could out-compete for C. demersum in many situations, that despite the similar ecology.
Highlights
Nitrogen (N) and phosphor (P) is one of the most limiting plant nutrients affecting the growth, nutrient uptakes of aquatic plants, despite phosphor being found in a small amount in the water. [1,2]
Our results showed a clear variation in the ratio of total chlorophyll of plants under study, the total chlorophyll was recorded with a maximum value 17.2 μg/g in (T2) in H. verticillata plant at high concertation and the minimum value was 2.45 μg/g in (T5) in control during 15th days of experimental (Figure-1)
The results of the study showed the highest rate of building chlorophyll pigment in T2 of H. verticillata, and the lowest rate of building chlorophyll pigment in the same model but in the other plant, and this may show us, that there is a clear dominance of the H. verticillata at the expense of C. demersum in this standard. 3.2 Chlorophyll a and b
Summary
Nitrogen (N) and phosphor (P) is one of the most limiting plant nutrients affecting the growth, nutrient uptakes of aquatic plants, despite phosphor being found in a small amount in the water. [1,2]. Nitrogen (N) and phosphor (P) is one of the most limiting plant nutrients affecting the growth, nutrient uptakes of aquatic plants, despite phosphor being found in a small amount in the water. The ecosystem structure, processes, and function depended on Nitrogen and Phosphorus that are considered of important nutrients for since their availability limits the production of plant biomass and growth [3]. Previous studies have shown that N supplementations could significantly affect shoot morphology and nutritional status of nursery seedlings [6]. The growth promoting effect of N (up to the optimum level) increases cytokinin production, which subsequently affects cell wall elasticity [7], the number of meristematic cells, and cell growth [8]. N fertilization increases seedling height and root collar diameter [9]
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