The interaction between GA3 and soaking time was significant on germination Cuscuta only on day 6 of Trial I (Table 7). The interaction result showed that, 250 ppm and 36 hours soaking time had significantly the highest germination of seeds compared to the C. campestris rest of the interaction effects, although it was comparable with 100 and 150 ppm with 36 hours. soaking time treatments (Table 8). DISCUSSIONS Effect of Wet Heat on Germination of Cuscuta campestris Dormancy in seeds is usually associated with the factors of protective covering such as the hard seed coat or enclosed embryo. In this study dipping seeds for 5 seconds in C. campestris wet heat were effective in breaking the seed dormancy compared with the control which recorded less germination for the period of the experiment. Wet heat might have weakening effect on the cuticle or lignin of the seed coat of thereby permitting the absorbsion C. campestris of more water that might probably leach out germination inhibitors present either in the seed coat or in the embryo. Ekhator (2008) have also used hot water treatment to enhance the et al. germination of Mart where 71% germination was observed when seeds were Mimosa invisa immersed in boiling water for 2 minutes. Similarly, Aliero (2004) reported that, treatment of seed for 4 seconds in hot water gave the highest germination of 42.4% when Parkia biglobosa compared with the control, 1, 2, 3 and 5 seconds hot water treatments. Effect of Mechanical Scarification on Germination of Cuscuta campestris Mechanically scarified seed with sandpaper continuously gave higher germination percentage of the combined mean followed by gravel and the least from the unscarified seeds (control) though not significant. Probably, this showed that seeds were more C. campestris scarified with sandpaper than the rest of the mechanical treatments which have less potential of breaking the dormancy of the seed. Similarly, Hutchison and Ashton (1979) reported that mature dodder seeds were induced to germinate by mechanical scarification with sandpaper. Aliero (2004) also reported that, total germination of seeds mechanically scratched in Parkia biglobosa gravels was 21.4% and no germination from the unscarified seeds (control).
The interaction between GA3 and soaking time was significant on Cuscuta germination only on day 6 of Trial I (Table 7). The interaction result showed that, 250 ppm and 36 hours soaking time had significantly the highest germination of C. campestris seeds compared to the rest of the interaction effects, although it was comparable with 100 and 150 ppm with 36 hours. soaking time treatments (Table 8). DISCUSSIONS Effect of Wet Heat on Germination of Cuscuta campestris Dormancy in seeds is usually associated with the factors of protective covering such as the hard seed coat or enclosed embryo. In this study dipping C. campestris seeds for 5 seconds in wet heat were effective in breaking the seed dormancy compared with the control which recorded less germination for the period of the experiment. Wet heat might have weakening effect on the cuticle or lignin of the seed coat of C. campestris thereby permitting the absorbsion of more water that might probably leach out germination inhibitors present either in the seed coat or in the embryo. Ekhator et al. (2008) have also used hot water treatment to enhance the germination of Mimosa invisa Mart where 71% germination was observed when seeds were immersed in boiling water for 2 minutes. Similarly, Aliero (2004) reported that, treatment of Parkia biglobosa seed for 4 seconds in hot water gave the highest germination of 42.4% when compared with the control, 1, 2, 3 and 5 seconds hot water treatments. Effect of Mechanical Scarification on Germination of Cuscuta campestris Mechanically scarified seed with sandpaper continuously gave higher germination percentage of the combined mean followed by gravel and the least from the unscarified seeds (control) though not significant. Probably, this showed that C. campestris seeds were more scarified with sandpaper than the rest of the mechanical treatments which have less potential of breaking the dormancy of the seed. Similarly, Hutchison and Ashton (1979) reported that mature dodder seeds were induced to germinate by mechanical scarification with sandpaper. Aliero (2004) also reported that, total germination of Parkia biglobosa seeds mechanically scratched in gravels was 21.4% and no germination from the unscarified seeds (control).
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