An influence of abiotic factors on the germinability of Agrostis species and Poa species

The objective of this contribution is to interpret the impact of some abiotic factors on the germinability. Primarily was observed the stress that they cause on germinability and also on the energy of other perennial grass caryopsis' germinability. Withal there were considered differences in germinability of some perennial grass species, variances of strains and the influence of today's seeds dressing technologies, which are used to improve the germination.
The light factor has the biggest influence of all factors on germination of Agrostis stolonifera (Penn G-2, Providence), Poa supina (Supranova) and Poa pratensis (Julius, Julius PreGerm). All these species had germination evidential higher in the light, than in the dark. With species Poa pratensis (Coctail, Coctail Headstart) and Poa annua were not observed any essential variations between the dark and the light variants. Only with Poa annua there were reached noticeably lower values with variant in the light, where was used polyethyleneglycol, than in the dark. The analysis of variance demonstrated, that the biggest influence had the factor of stratification together with the light factor with Agrostis capilaris (Bardot) and Agrostis stolonifera Providence. With Poa annua there was established the biggest influence of the light factor together with the factor of the used medium.
The factor of stratification noticeably affected only the germination of Agrostis capillaris Bardot. The germination of Agrostis stolonifera Providence, Poa pratensis Cocktail, Cocktail Headstart, Julius and Poa annua was not noticeably affected by stratification. The reaction on the factor of stratification was with Agrostis capillaris Bardot in the dark adverse and in the light minimal. Poa pratensis Julius PreGerm germination was negative in the dark as well as in the light. With Poa supina Supranova it was not the most important factor, but still affected the germination significiantly.
The nitrogen nutrition, as the next factor, had positive affect with all variants. This could be explained with existence of the "gap detection" mechanism. Especially variants in the dark and with used stratification had affected theirs germination positively, when combinated with H₂O and potassium nitrate. The addition of potassium nitrate positively affected also the energy of germination.
With the lack of water factor was affected amount of germinated caryopsis and their energy of germination. Especially with higher water tonus was energy of germination and germination itself decreased. The only exceptions were these variants in the dark with the stratification factor. With these conditions was achieved the same or even higher quality of germination of variants, where PEG was added than was achieved with H₂O variants.

Keywords: grass species, germination, light, stratification, the lack of water, nitrogen nutrition

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Uvedená práce je výsledkem řešení dílčí části rozvojového projektu FRVŠ č. 213.