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4 results for “primary seed dormancy”
Effects of primary seed dormancy on life-time fitness of Arabidopsis thaliana in the field
<p class="MsoNoSpacing"><strong>Background and Aims</strong><em> </em>Seed dormancy determines the environmental niche of plants in seasonal environments, and has consequences for plant performance that potentially go far beyond the seed and seedling stages. In this study, we examined the cascading effects of seed dormancy on the expression of subsequent life-history traits and fitness in the annual herb <em>Arabidopsis thaliana</em>.<em> </em></p> <p class="MsoNoSpacing"><strong>Methods </strong>We planted seeds of >200 recombinant inbred lines (RIL) derived from a cross between two locally adapted populations (Italy and Sweden), and both parental genotypes at the native site of the Swedish population in three consecutive years. We quantified the relationship between primary seed dormancy and the expression of subsequent life-history traits and fitness in the RIL population with path analysis. To examine effects of differences in dormancy on relative fitness of the two parental genotypes, we planted dormant seeds during the seed dispersal period and non-dormant seeds during the germination period of the local population.</p> <p class="MsoNoSpacing"><strong>Key Results </strong>In the RIL population,<strong> </strong>strong primary dormancy was associated with high seedling survival, but with low adult survival and fecundity, and the path analysis indicated that this could be explained by effects on germination timing, rosette size, and flowering start. The relationship between primary seed dormancy and germination proportion varied among years, and this was associated with differences in seasonal changes in soil moisture. The planting of dormant and nondormant seeds indicated that the lower primary dormancy of the local Swedish genotype contributed to its higher germination proportion in two years, and to its higher fecundity in one year. </p> <p class="MsoNoSpacing"><strong>Conclusions </strong>Our results show that seed dormancy affects trait expression and fitness components across the life cycle, and suggest that among-year variation in the incidence of drought during the germination period should be considered when predicting the consequences of climatic change for population growth and evolution.</p>
A quantitative analysis of primary dormancy and dormancy changes during burial in seeds of Brassica napus
<p>For plants inhabiting unpredictable environments, scheduling germination can be challenging. Various responses to environmental conditions have been evolved by plants; these responses combine with variation in local climate to construct germination niche. Germination process may be regulated by a number of factors, among them, the type of seed dormancy and dormancy cycling play an important role in promoting survival after dispersal. In the present study, seeds of <i>Brassica napus</i> were tested for primary conditional dormancy (CD). Dormancy changes were quantified through seed population thermal germination parameters to test whether different genotypes of <i>B. napus</i> seeds (<span>944, 966, Alestrom, Danube, Okanto and Rohan</span>) are non-dormant (ND) at the maturity or if they present primary dormancy (D or CD). In a burial experiment, <i>B. napus</i> seeds dormancy cycling in the natural soil seedbank was investigated. Germination of all genotypes decreased at 5 and >20 <sup>o</sup>C, showing narrower breadth of thermal niche for germination. Dormancy-breaking Treatments lead to the widening of thermal range permissive for germination. The lower limit (<i>T<sub>l(50)</sub></i>) and higher limit (<i>T<sub>h(50)</sub></i>) temperatures for germination decreased and increased, respectively, for non-dormant (after-ripened seeds treated with GA<sub>3</sub>) seeds compared with fresh seeds in all genotypes. In fresh seeds, the <i>T<sub>l(50) </sub></i>and <i>T<sub>h(50)</sub></i> for various genotypes ranged from 3.61 to 6.5<sup>o</sup>C and 25.0 to 29.0<sup>o</sup>C, respectively and ranged from 0.2 to 1.8<sup>o</sup>C and 35 to 41.0<sup>o</sup>C in non-dormant seeds. Thus, fresh seeds of <i>B. napus</i> are dormant at dispersal and adopt delayed germination strategies to avoid summer drought. In the burial experiment, the results indicated that<i> B. napus</i> must have D/ND cycle in which fresh seeds first become dormant and then the cycle begins (CD → D ↔ CD ↔ ND), thus adopting both risk-prone and risk- adverse strategies to spread the likelihood of survival over time.</p>
Effects of primary seed dormancy on life-time fitness of Arabidopsis thaliana in the field
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A quantitative analysis of primary dormancy and dormancy changes during burial in seeds of Brassica napus
Open the record for dataset details and reuse information.
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