Germination characteristics of grass seed risen on the seed-bed surface
1997
Morita, O. (Mie Univ., Tsu (Japan). Faculty of Bioresources) | Ehara, H. | Goto, M. | Ogihara, S.
Rising behaviors during early germination characteristics of seeds were investigated to atain some informations for better seedling establishment of surface-sown herbage grasses. Tall fescue (Festuca arundinacea Schreb. Kentucky 31 fescue) and Italian regress (Lolium multiflorum Lam. Sakurawase) were used for the examinations. Seeds of both species were put lemma-side down on the filter paper and germinated in constant 25 degrees C. The timing of three germination phases as coleorhiza appearance, coleorhiza hair emergence and rooting of both species were observed both with rising behavior (RB) seeds and exposed-root (EB) seeds. The coleorhiza size, and number and maximum length of coleorhiza hairs of RB and EB seeds were also examined at the rooting time. In both species, coleorhiza thickness, number and length of coleorhiza hair in RB were significantly larger than those in EB. In the germination process of both species, coleorhiza hair of RB emerged earlier, while the rooting time was later than those of EB. Tall fescue, which has higher percentage of RB seeds as compared with Italian ryegrass, had longer adhering duration because of the late rooting. These facts suggest that the firm adhesion of coleorhiza hairs of RB may be achieved with its longer growing and adhering time together with its larger number and length in each species
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