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GERMINATION RESPONSES TO LIGHT AND ALTERNATING TEMPERATURES IN EUROPEAN POPULATIONS OF DACTYLIS GLOMERATA L. III. THE ROLE OF THE OUTER COVERING STRUCTURES.

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Title: GERMINATION RESPONSES TO LIGHT AND ALTERNATING TEMPERATURES IN EUROPEAN POPULATIONS OF DACTYLIS GLOMERATA L. III. THE ROLE OF THE OUTER COVERING STRUCTURES.
Authors: Probert, R. J.1, Smith, R. D.1, Birch, P.2
Source: New Phytologist. Jul85, Vol. 100 Issue 3, p447-455. 9p.
Subjects: Orchard grass, Plant physiology, Germination, Physiological effects of temperature, Light, Physiological effects of oxygen, Seeds
Abstract: The influence of the outer covering structures (palea, lemma and pericarp) on the germination response to light and alternating temperatures was investigated in two populations of Dactylis glomerata L. Removal of the palea and lemma was less effective than light or alternating temperatures in promoting germination. Despite quantitative differences, both populations responded similarly to all three factors. Statistical analysis of data transformed to probits indicated mainly additive effects when factors were combined. Selective surgical treatments showed that the structural integrity of the pericarp was also important in germination control. Removal of the palea and lemma followed by the making of a shallow incision in the pericarp close to the embryo, stimulated germination in a very high proportion of individuals (94 %) even at a constant temperature (16 °C) in the dark. Elevated oxygen levels promoted germination of intact seeds suggesting that the outer coverings might restrict oxygen access. Evidence is presented that positive pressures (0.03 MPa) applied during gassing led to a reduction in germination. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The influence of the outer covering structures (palea, lemma and pericarp) on the germination response to light and alternating temperatures was investigated in two populations of Dactylis glomerata L. Removal of the palea and lemma was less effective than light or alternating temperatures in promoting germination. Despite quantitative differences, both populations responded similarly to all three factors. Statistical analysis of data transformed to probits indicated mainly additive effects when factors were combined. Selective surgical treatments showed that the structural integrity of the pericarp was also important in germination control. Removal of the palea and lemma followed by the making of a shallow incision in the pericarp close to the embryo, stimulated germination in a very high proportion of individuals (94 %) even at a constant temperature (16 °C) in the dark. Elevated oxygen levels promoted germination of intact seeds suggesting that the outer coverings might restrict oxygen access. Evidence is presented that positive pressures (0.03 MPa) applied during gassing led to a reduction in germination. [ABSTRACT FROM AUTHOR]
ISSN:0028646X
DOI:10.1111/j.1469-8137.1985.tb02793.x