Studies on the allelopathic effect of aquatic invasive plants on Cicer arietinum L.

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Radical Elongation (cm) Radical Elongation (cm) Rate of Germination (%) Rate of Germination (%) <strong>Studies</strong> on the Allelopathic effect of aquatic invasive plants On Cicerarietinum L. Results displaying the effect of extracts of Eichhornia crassipes and Pistia stratiotes on the total phenol content of Cicer arietinum in 15 day old seedlingsis given in Fig.10 & 11. The total phenolic content recorded the highest in 10 ppm treated seeds in both the plant extracts treated. The total phenol content of seeds treated with extracts of E.crassipes and P.stratiotes showed a increase with increase in the extract concentrations, the 10 ppm treatment with E.crassipes recorded a threefold increase in the phenol content(0.5mg/g ),while Pistia stratiotes recorded only a two fold increase over the control. In seeds treated with extracts of E.crassipes and P.stratiotes,0.01 ppm concentration of the extract showed the minimum increase of 16% inP.stratiotes and 33 % in E.crassipes. Phenolic compounds are a class of the most important and common plant allelochemicals in the ecosystem (Li et al. 2010). The inhibitory action of the aqueous extracts or mulch of P. dioscoridis is possibly attributed to the presence of phenolic compounds. (Kim et al. 2003) .The role of some identified phenolics as allelopathic agents present in walnut tissues, also reduced the germination of dandelion seeds and the catechin was most strongest inhibitor. (Matok et al. 2009).The highest concentration of the phenolic compounds inhibited the germination of all these weeds, but lower concentrations had no effect or were stimulatory. (Reigosa1999) IV: Figures & Tables 90 Effect of Eichornia crassipes on the rate of Seed germination in Cicer arietinum 120 Effect of Pistia stratiotes on the rate of Seed germination in Cicer arietinum 60 24 Hrs 48 Hrs 80 24 Hrs 48Hrs 40 30 0 5 10 Concentration (ppm) 0 0 5 10 Concentration (ppm) Fig. 1 Fig. 2 Fig.1: Effect of Eichornia crassipes on the rate Fig.2: Effect of Pistia stratiotes on the rate of seed germination in Cicer arietinum of seed germination in Cicer arietinum. 30 24 Day 2 Day 4 Effect of of Eichornia crassipes Day 6 on radicle elongation Day 8 of Cicer arietinum Day 10 30 24 Day 2 Day 4 Day 6 Day 8 Day 10 Effect of Pistia stratiotes on radicle elongation of Cicer arietinum 18 18 12 12 6 0 5 10 Concentration (ppm) 6 0 5 10 Concentration (ppm) Fig. 3 Fig. 4 Fig. 3. Effect of Eichornia crassipes on radicle Fig. 4. Effect of Pistia stratiotes on radicle elongation ofCicer arietinum elongation ofCicer arietinum www.theijes.com The IJES Page 45
Weight Chla (µg/g) Chla (µg/g) Plumule elongation (cm) Plumule elongation (cm) <strong>Studies</strong> on the Allelopathic effect of aquatic invasive plants On Cicerarietinum L. 15 10 Effect of Eichornia crassipes on plumule elongation of Cicer arietinum Day 2 Day 4 Day 6 Day 8 Day 10 15 10 Effect of Pistia stratoides on plumule elongation of Cicer arietinum Day 2 Day 4 Day 6 Day 8 Day 10 5 5 0 0 5 10 Concentration (ppm) 0 0 5 10 Concentration (ppm) Fig. 5 Fig. 6 Fig. 5. Effect of Eichornia crassipes on plumule Fig. 6 Effect of Pistia stratoides on plumule elongation ofCicer arietinum. elongation ofCicer arietinum. 6 6 5 Effect of Eichornia crassipes on the chlorophyll content in Cicer arietinum 5 Effect of Pistia statoides on the chlorophyll content in Cicer arietinum 4 3 Chla Chlb Total Chlorophyll 4 3 Chla Chlb Total Chlorophyll 2 2 1 1 0 0 5 10 Concentration (ppm) 0 0 5 10 Concentration (ppm) Fig. 7 Fig. 8 Fig.7. Effect of Eichornia crassipes on the Fig.8. Effect of Pistia stratoides on the chlorophyll content in Cicer arietinum. chlorophyll content in Cicer arietinum. 0.4 The Fresh and Dry wt in 15 day old seedlings 0.3 Fresh Weigt Pistia Dry Weight Pistia Fresh Weight Eichornia Dry weight Eichornia 0.2 0.1 0 5 10 Concentration (ppm) Fig. 9 Fig. 9. The Fresh and Dry wt (mg) in 15 day old seedlings www.theijes.com The IJES Page 46
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Studies on the allelopathic effect of aquatic invasive plants on Cicer arietinum L.

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