GERMINATION RESPONSES TO LIGHT AND ALTERNATING TEMPERATURES IN EUROPEAN POPULATIONS OF DACTYLIS GLOMERATA L. V. THE PRINCIPLE COMPONENTS OF THE ALTERNATING TEMPERATURE REQUIREMENT.
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| Title: | GERMINATION RESPONSES TO LIGHT AND ALTERNATING TEMPERATURES IN EUROPEAN POPULATIONS OF DACTYLIS GLOMERATA L. V. THE PRINCIPLE COMPONENTS OF THE ALTERNATING TEMPERATURE REQUIREMENT. |
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| Authors: | Probert, R. J.1, Smith, R. D.1, Birch, P.2 |
| Source: | New Phytologist. Jan1986, Vol. 102 Issue 1, p133-142. 10p. |
| Subjects: | Orchard grass, Germination, Effect of light on plants, Effect of temperature on plants, Plant embryology, Plant physiology |
| Abstract: | Detailed germination responses to temperature and light in two populations of Dactylis glomerata L. originating from S.E. Denmark and W. France were defined using thermogradient bars. Despite quantitative differences patterns of response were broadly similar. In both cases seeds were sensitive to the relative periods spent at the warm and cool phases of alternating temperature cycles with germination markedly reduced in diurnal cycles involving a 16 h warm phase and an 8 h cool phase. Whereas the proportion of seeds capable of germination increased sharply as the amplitude of temperature alternation increased the optimum amplitude was dependent on both the period spent at each phase and the presence or absence of light. Even under optimum temperature conditions there was an overriding requirement for light in a high proportion of individuals. When five 21/11°C cycles of reduced duration were applied at 24 h intervals, 1 h/2 h alternations were as effective in stimulating germination as diurnal cycles. Germination response was directly related to the logarithm of the number of diurnal 21/11°C cycles applied in three different seed samples. Sensitivity was not related to inherent dormancy status (between populations) or to a degree of after-ripening. [ABSTRACT FROM AUTHOR] |
| Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 12499673 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: GERMINATION RESPONSES TO LIGHT AND ALTERNATING TEMPERATURES IN EUROPEAN POPULATIONS OF <em>DACTYLIS GLOMERATA</em> L. V. THE PRINCIPLE COMPONENTS OF THE ALTERNATING TEMPERATURE REQUIREMENT. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Probert%2C+R%2E+J%2E%22">Probert, R. J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Smith%2C+R%2E+D%2E%22">Smith, R. D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Birch%2C+P%2E%22">Birch, P.</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22New+Phytologist%22">New Phytologist</searchLink>. Jan1986, Vol. 102 Issue 1, p133-142. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Orchard+grass%22">Orchard grass</searchLink><br /><searchLink fieldCode="DE" term="%22Germination%22">Germination</searchLink><br /><searchLink fieldCode="DE" term="%22Effect+of+light+on+plants%22">Effect of light on plants</searchLink><br /><searchLink fieldCode="DE" term="%22Effect+of+temperature+on+plants%22">Effect of temperature on plants</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+embryology%22">Plant embryology</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+physiology%22">Plant physiology</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Detailed germination responses to temperature and light in two populations of <em>Dactylis glomerata</em> L. originating from S.E. Denmark and W. France were defined using thermogradient bars. Despite quantitative differences patterns of response were broadly similar. In both cases seeds were sensitive to the relative periods spent at the warm and cool phases of alternating temperature cycles with germination markedly reduced in diurnal cycles involving a 16 h warm phase and an 8 h cool phase. Whereas the proportion of seeds capable of germination increased sharply as the amplitude of temperature alternation increased the optimum amplitude was dependent on both the period spent at each phase and the presence or absence of light. Even under optimum temperature conditions there was an overriding requirement for light in a high proportion of individuals. When five 21/11°C cycles of reduced duration were applied at 24 h intervals, 1 h/2 h alternations were as effective in stimulating germination as diurnal cycles. Germination response was directly related to the logarithm of the number of diurnal 21/11°C cycles applied in three different seed samples. Sensitivity was not related to inherent dormancy status (between populations) or to a degree of after-ripening. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/j.1469-8137.1986.tb00805.x Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 133 Subjects: – SubjectFull: Orchard grass Type: general – SubjectFull: Germination Type: general – SubjectFull: Effect of light on plants Type: general – SubjectFull: Effect of temperature on plants Type: general – SubjectFull: Plant embryology Type: general – SubjectFull: Plant physiology Type: general Titles: – TitleFull: GERMINATION RESPONSES TO LIGHT AND ALTERNATING TEMPERATURES IN EUROPEAN POPULATIONS OF <em>DACTYLIS GLOMERATA</em> L. V. THE PRINCIPLE COMPONENTS OF THE ALTERNATING TEMPERATURE REQUIREMENT. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Probert, R. J. – PersonEntity: Name: NameFull: Smith, R. D. – PersonEntity: Name: NameFull: Birch, P. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan1986 Type: published Y: 1986 Identifiers: – Type: issn-print Value: 0028646X Numbering: – Type: volume Value: 102 – Type: issue Value: 1 Titles: – TitleFull: New Phytologist Type: main |
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