[Cold and winter hardiness of diploid and tetraploid perennial ryegrass]
1998
Lemezis, E. (Lithuanian Institute of Agriculture, Dotnuva (Lithuania))
The results obtained in the investigations showed that cold hardiness of the tested material was continuously increasing from sprouts stage to the beginning of tillering. With increasing the stage of plant development the differences in cold hardiness among diploids and derivative tetraploids became less significant although the percentage of survived diploids after freezing was higher than that of tetraploids. Diploids and tetraploids reached the highest cold hardiness at the beginning of tillering stage after outside hardening (survived from 52.4 'Syn 1' (4n) to 66.7 plants 'Priekulu 59' (2n) after freezing at -18 deg C).
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