+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Annual seed dormancy cycles in two desert winter annuals

Annual seed dormancy cycles in two desert winter annuals

American Journal of Botany 80(6 SUPPL ): 53-54

1 Freshly matured seeds of Eriogonum abertianum Torr. and Eriastrum diffusum (Gray) Mason and those of both species exhumed after various periods of burial in the Chihuahuan Desert in Arizona, USA, were tested for germination in light and darkness at five thermoperiods. 2 Seeds of Eriogonum were nondormant (ND) at maturity in autumn 1988, and thus 87% of them germinated in light at 15/6 and at 20/10 degree C. Seeds entered conditional dormancy (CD) in winter; germination at 20/10 degree C decreased to 6% in light. However, a high percentage of the seeds were again ND by autumn 1990. Thus, like seeds of facultative winter annuals in humid, temperate regions, those of Eriogonum have an annual CD/ND cycle, which is characteristic of annuals in unpredictable habitats. 3 Seeds of Eriastrum were dormant (D) at maturity in May 1989. A portion of the seeds after-ripened during summer, and in October 65 and 38% of them germinated in light at 15/6 and 20/10 degree C, respectively. Most of the ND seeds re-entered dormancy during winter, but by the following October 92% of them were ND. Thus, like seeds of obligate winter annuals in humid, temperate regions, those of Eriastrum exhibit an annual D/ND cycle, which is characteristic of annuals in predictable habitats. 4 This is the first report of dormancy cycles in seeds of desert winter annuals.

(PDF emailed within 0-6 h: $19.90)

Accession: 002301976

Download citation: RISBibTeXText

DOI: 10.2307/2261533

Related references

Dormancy mechanisms in desert winter annuals Variation in germination strategies within and between years. Bulletin of the Ecological Society of America 76(3 SUPPL ): 297, 1995

Investigation on seed dormancy of some winter annuals of iraqi deserts. Bulletin of the College of Science University of Baghdad 11(PART 2): 21-23, 1970

The effects of soil water potential on seed germination of four winter annuals in the negev desert highlands israel. Journal of Arid Environments 19(1): 77-84, 1990

Interaction of rainfall and elevated CO2 on population and growth dynamics of native Mojave Desert winter annuals and an exotic annual grass. Ecological Society of America Annual Meeting Abstracts 86: 244, 2001

Seed germination of a desert annual predictive dormancy. American Journal of Botany 76(6 SUPPL): 120-121, 1989

Seed dormancy in lepidium lasiocarpum a desert annual. Bulletin of the Ecological Society of America 71(2 SUPPL): 285, 1990

Seed dispersal, germination and flowering strategies of winter desert annual plants of the Negev desert. Biologia Plantarum (Prague) 36(SUPPL ): S272, 1994

Some relationships between environmental reliability and seed dormancy in desert annual plants. Journal of Ecology 71(1): 211-218, 1983

Seed dormancy pattern and seed reserves as adaptations of the endemic winter annual Lesquerella lescurii (Brassicaceae) to its floodplain habitat. Natural Areas Journal 12(4): 184-190, 1992

Dormancy and germination in a guild of Sonoran Desert annuals. Ecology 85(9): 2582-2590, 2004

Trade-offs between seed dispersal and dormancy in an amphi-basicarpic cold desert annual. Annals of Botany 112(9): 1815-1827, 2014

Precipitation and the relative abundances of desert winter annuals a 6 year study in the northern mohave desert nevada usa. Journal of Arid Environments 12(2): 141-150, 1987

Temperature effects on seed maturity and dormancy cycles in an aquatic annual, Najas marina, at the edge of its range. Journal of ecology 93(6): 1185-1193, 2005

Seed dormancy in the wetland winter annual Ptilimnium nuttallii (Apiaceae). Wetlands 19(2): 359-364, 1999