With highly dormant seeds, an afterripening treatment is required to distinguish genotypic differences in dormancy strength and to realistically estimate genetic variance (Gu et al., 2003).
Abbreviations: DAR, days of afterripening; PHS, preharvest sprouting; QTL, quantitative trait loci.
Cirsium pitcheri may be yet another member of the Asteraceae for which the m inimum temperatures for germination decrease during afterripening
(Type 2 response of Vegis, 1964), observed in 22 of 32 species of the family tested (Baskin and Baskin, 1988; Buchele et al., 1991; Baskin et al., 1993).
Since there was no detectable difference in the germination of intact nonafterripened seeds among the dormant lines, we determined their germination following various periods of afterripening
. Using this technique, significant differences were detected in the number of days required to achieve an estimated level of 50% germination of intact seeds (Fig.
The differences may be due to the additional afterripening
of the Utah seeds, differences in preconditioning (Baskin and Baskin, 1973), or the two populations from different parts of the species range may be displaying adaptations to significant locally selective pressures (Thompson, 1981).
for 12 mo at 30 [degrees] C did not release all seeds from primary dormancy, especially at the lowest MC.
Role of endogenous ethylene and inhibitory regulators during natural and induced afterripening
of dormant Virginia-type peanut seeds.