Dormancy and the Control of Germination

Bewley, J. Derek; Black, M.

doi:10.1007/978-1-4615-1747-4_5

Cited by 20 publications

(24 citation statements)

References 39 publications

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“…Natural sunlight creates a comparatively high u, whereas leaf-transmitted light creates a low u. The u of phytochrome required for germination differs among plant species (Bewley and Black 1994). Therefore, the requirement of a more reliable gap signal assures that this low u is maintained.…”

Section: Discussionmentioning

confidence: 98%

“…When the inactive form of phytochrome (P r ) absorbs R light, which generally stimulates germination, it is transformed to the active form (P fr ); in contrast, when P fr absorbs FR light, it is transformed to P r (Kendrick and Spruit 1977). Light brings about a ''photoequilibrium'' in the ratio of P fr /P total (i.e., active form/total phytochrome: u; Bewley and Black 1994). Natural sunlight creates a comparatively high u, whereas leaf-transmitted light creates a low u.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Strict requirement of fluctuating temperatures as a reliable gap signal in Picris hieracioides var. japonica seed germination

Honda

Katoh

2007

Plant Ecol

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Strict requirement of fluctuating temperatures as a reliable gap signal in Picris hieracioides var. japonica seed germination

Honda

Katoh

2007

Plant Ecol

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“…Seeds requiring after-ripening are often already dormant when they are dispersed from the plant. In the dried condition, they slowly lose their dormancy through after-ripening (Bewley and Black 1994), and it then becomes possible for them to be non-dormant and germinate under a wide range of environmental conditions. Since such seeds need time to become non-dormant, they may fail to germinate for several years.…”

Section: Discussionmentioning

confidence: 99%

“…The contribution of dormancy to the formation or persistence of a seed bank is different in each dormancy type. A high proportion of species can be released from dormancy when they are exposed to low temperatures in hydrated conditions (Bewley and Black 1994). The requirement for chilling to break dormancy represents a natural mechanism to ensure that germination occurs in spring (Probert 2000); hence, such species can germinate in the first spring after seed dispersal.…”

Section: Discussionmentioning

confidence: 99%

Ecological correlations between the persistence of the soil seed bank and several plant traits, including seed dormancy

Honda

2007

Plant Ecol

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It was empirically showed that seed size and life history correlate with the formation of a soil seed bank. Although no empirical data are available that indicate a close relationship between seed dormancy and the soil seed bank, dormancy has been considered essential to the formation of a soil seed bank. I have considered the formation of the soil seed bank and survival of seeds for more than a year in the soil, and the persistence and survival of the seed bank for more than 5 years. These periods were derived from the definition of a persistent seed bank and the criterion for seed banks of long-term persistence. Plant traits that are closely related to the formation or persistence of a seed bank and their relationships to dormancy were analysed using two pre-existing databases of seed longevity in soil and comparative ecology. The integrated database comprised 18 plant traits and seed bank formation or persistence data. This approach was used to identify more reliable general empirical rules. The results of a regression tree analysis and common statistical tests of plant traits indicated that only life history and seed size were closely related to seed bank formation, and dormancy was not essential for the formation and persistence of a seed bank. However, the contribution of dormancy differed slightly between dormancy types. Scarification or dry storage requirements to break dormancy slightly enhanced the formation and persistence of a seed bank, whereas a chilling requirement decreased the formation and persistence of a seed bank. In contrast, fluctuating temperature requirements clearly contributed to the formation and persistence of a seed bank.

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“…Seed storability is determined by at least two factors: (i) the amount of energy which is available for germination, and (ii) the amount of damage which accumulates during development and storage and which has to be repaired before germination (Osborne, 1983). Before root protrusion, the low molecular weight substances available for respiration cannot increase considerably, since the mobilization of the main storage reserves in the seed is almost completely a post-germination event (Bewley and Black 1985). The advancement of the germination processes during priming continuously consumes these substances, and consequently, may shorten seed longevity.…”

Section: Discussionmentioning

confidence: 99%

Effects of osmotic priming on dormancy and storability of tomato (Lycopersicon esculentumMill.) seeds

Liu

Bino²,

Burg³

et al. 1996

Seed Sci. Res.

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Freshly harvested tomato (Lycopersicon esculentum Mill, cv. Moneymaker) seeds were osmotically primed for 8 d in -1.0 MPa PEG-6000 solution and dried to about 6% water content for storage. Such so-called 'fresh PEG priming' enhanced seed germination and improved seedling performance as compared with the untreated control. Fresh PEG priming neither alleviated seed dormancy nor promoted DNA replication as was the case when seeds were dried upon harvest and subsequently primed in PEG (normal PEG priming). However, the addition of 10 JIM GA 4+7 to the osmotic priming solution triggered replicative DNA synthesis of fresh-priming seeds and further enhanced the germination process. After 5 months of storage in ambient temperature conditions, fresh PEG-primed seeds maintained more positive effects gained from priming, whereas, normal PEG-primed seeds had lost the promoting effects on germination. Normal PEG-primed seeds were much more susceptible to controlled deterioration than fresh PEG-primed seeds. It is suggested that the advancement of germination is negatively correlated with seed storability. The mechanisms of seed priming in relation to nuclear replication activities and physical changes are discussed.

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Dormancy and the Control of Germination

Cited by 20 publications

References 39 publications

Strict requirement of fluctuating temperatures as a reliable gap signal in Picris hieracioides var. japonica seed germination

Strict requirement of fluctuating temperatures as a reliable gap signal in Picris hieracioides var. japonica seed germination

Ecological correlations between the persistence of the soil seed bank and several plant traits, including seed dormancy

Effects of osmotic priming on dormancy and storability of tomato (Lycopersicon esculentumMill.) seeds

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