PRIMARY DORMANCY, AFTER‐RIPENING, AND THE DEVELOPMENT OF SECONDARY DORMANCY IN EMBRYOS OF <i>AMBROSIA TRIFIDA</i>

Davis, W. E.

doi:10.1002/j.1537-2197.1930.tb09533.x

Cited by 61 publications

(54 citation statements)

References 7 publications

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“…In this connection it is interesting to note that further growth of the cotyledons is not retarded as much at the higher temperatures as is the growth of the hypocotyl. In this respect the embryos are somewhat similar to the embryos of Crataegus (3) and Ambrosia (2). Abnormal germination is not uncommon in the seeds of black ash and in other species of ash.…”

Section: Dormancy and Growth Of Excised Embryos Of Black Ashsupporting

confidence: 59%

DORMANCY AND GERMINATION OF FRAXINUS SEEDS

Steinbauer

1937

Plant Physiol.

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Section: Dormancy and Growth Of Excised Embryos Of Black Ashsupporting

confidence: 59%

DORMANCY AND GERMINATION OF FRAXINUS SEEDS

Steinbauer

1937

Plant Physiol.

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“…These ungerminated florets would be able to survive in this state for months or years (Goss and Brown, 1939;Cohn, in preparation). Secondly, cold stratification at 1 and 58C was effective in promoting subsequent germination, particularly after partial dry AR, as observed with other species, such as Ambrosia trifida (Davis, 1930), Amelanchier canadensis (Crocker and Barton, 1931), Sorbus aucuparia (Flemion, 1931), and Rhodotypos kerrioides (Flemion, 1933). Thirdly in contrast, intermediate-low temperatures (158C) induced secondary dormancy.…”

Section: Discussionmentioning

confidence: 89%

Seed dormancy in red rice. XIII: Interaction of dry-afterripening and hydration temperature

Gianinetti¹,

Cohn

2008

Seed Sci. Res.

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While red rice (Oryza sativa L.) can remain dormant and viable for many years when fully imbibed, the environmental factors that stimulate germination or induce secondary dormancy in the field have not been characterized. In this study, the interactions between the extent of dry-afterripening and germination temperature have been evaluated as possible factors. Red rice dispersal units (florets) were afterripened for 0 -10 weeks at 308C and incubated in water at 1, 5, 15, 20, 25, 30 and 358C for 2 weeks; then, all the ungerminated florets were transferred to 308C for two additional weeks. Germination at the end of each of the two sequential treatments was compared to define both the effect of differing temperatures on germination (first treatment), and the effect of these temperatures on subsequent germination at the optimum temperature (308C, second treatment). In afterripening red rice, the opening of the temperature window for germination begins at 25 -358C. Fully dormant florets acquired the ability to germinate $ 90% at 308C after 4 weeks of dry-afterripening. However, imbibing florets for 2 weeks at 158C followed by 2 weeks at 308C, yielded suboptimal germination and induced a degree of secondary dormancy, dependent upon the extent of previous dry-afterripening. Cold stratification (18C) had a consistent promotive effect on the subsequent germination, particularly when preceded by 1-2 weeks of dry-afterripening at 308C. To monitor the effects of germination temperature, median afterripening time was utilized as a relative dormancy index, and changes in this index have been interpreted as an overlapping of germination and the temperature-induced changes in the dormancy status. Field weather data suggested that low-temperature stratification may be a germination trigger in the field, even in southern Louisiana, and this merits further investigation in studies of soil-buried seeds.

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“…For example, some seeds that normally are cold (moist) stratified in nature will afterripen during dry storage at room temperature (Davis 1930). Many seed biologists have made the assumption that storing seeds at low temperatures (e.g., 5°C) will prevent dormancy break from occurring.…”

Section: Discussionmentioning

confidence: 99%

Variation in seed germination between populations of five sub‐alpine woody species from eastern Qinghai‐Tibet Plateau following dry storage at low temperatures

Wang

Baskin

Chen

et al. 2009

Ecological Research

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Effects of cold-dry storage on dormancy break and viability were determined for seeds of the five subalpine woody species Philadelphus incanus, Berberis vernae, Berberis dubia, Betula utilis, and Picea purpurea collected along an altitudinal gradient on the eastern part of the Qinghai-Tibet Plateau in China. Germination tests were conducted at 20/5°C for seeds stored dry at ambient room temperature for 4 weeks and then at 3-4°C for 0, 6, 12, and 24 weeks. Dormancy break during dry storage, i.e., afterripening, was indicated by an increase in germination percentages and rates. Duration of cold-dry storage and altitude of seed collection had significant effects on germination. With an increase in duration of storage, germination percentages and rates of P. incanus and B. vernae increased with a decrease in altitude of seed collection, while they increased with an increase in altitude for seeds of B. utilis and P. purpurea. Seeds of B. dubia did not exhibit changes in germination percentages and rates with altitude because a high number of seeds remained dormant during storage. Seed viability after 24 weeks of storage ranged from high (88, 93.3, 92.7%) for B. utilis to low (15% for high altitude) for P. incanus. The potential for dormancy break to occur during cold-dry storage should be considered when studies on basic seed dormancy are conducted or when seeds from various locations are stored prior to propagating plants from them.

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PRIMARY DORMANCY, AFTER‐RIPENING, AND THE DEVELOPMENT OF SECONDARY DORMANCY IN EMBRYOS OF AMBROSIA TRIFIDA

Cited by 61 publications

References 7 publications

DORMANCY AND GERMINATION OF FRAXINUS SEEDS

DORMANCY AND GERMINATION OF FRAXINUS SEEDS

Seed dormancy in red rice. XIII: Interaction of dry-afterripening and hydration temperature

Variation in seed germination between populations of five sub‐alpine woody species from eastern Qinghai‐Tibet Plateau following dry storage at low temperatures

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