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Fig. 13.11 Comparison of radicle growth inhibition in bean seedlings under different boron concentrations

Boron Concentrations(ppm)

Fig. 13.11 Comparison of radicle growth inhibition in bean seedlings under different boron concentrations rate was calculated as (-) 86, (-) 82, (-) 80, (-) 83, (-) 82% respectively (Fig. 13.11).

The germination inhibitory rate of chickpea was calculated as 54, 60,49, 20% at 50,100,250, 500 mg L-1 boron exposures respectively. It decreased gradually from (-) 23% to (-) 91% at other concentrations (p < 0.05) (Fig. 13.12). The germination inhibitory rate of maize was calculated as 10% at 50 mg L-1 boron but decreased gradually from (-) 9 to (-) 90 (p < 0001) (Fig. 13.13). The germination inhibitory rate of wheat was calculated as 13% at 10 mg L-1 boron and other concentrations (50, 100, 250, 500, 750, 1000 mg L-1 boron and GA3) but decreased gradually from (-) 13% to (-) 87% (p < 0.001). With IAA, ABA and KIN inhibitory rate of germination in wheat was calculated as 17.5, 14.2, 13.8% respectively (p < 0.05) (Fig. 13.14).

The germination inhibitory rate of barley was calculated as 4.4% at 10 mg L-1 boron and the other concentrations decreased gradually from 14 to (-) 94% (p < 0.001) (Fig. 13.15). The germination inhibitory rate of tomato decreased gradually at all concentrations from (-) 31 to (-) 100% (p < 0.001) (Fig. 13.16).

The results confirmed that boron is indeed an essential micronutrient element (at 10 and 50 mg L-1 concentrations) but when it is in excess it is toxic for plants as (Kocacaliskan and Olcer 2006; Konuk et al. 2007). GA3, IAA, ABA and KIN did not alleviate the boron induced growth inhibition effect significantly.

8 Boron and Genotoxicity in Plants

Plant mutagenicity bioassays have been in existence for many years. The plant bioassays are now well-established systems, used for screening and monitoring of

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