Results 301 to 310 of about 1,070,626 (346)
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Physiologia Plantarum, 1968
AbstractIris embryos were treated in several ways to study the cause of delayed germination. The results of this work indicate that a chemical inhibitor is present in the endosperm and mechanical inhibition of embryo growth also occurs. The mechanical inhibition reduces excised Iris embryo growth to the same extent as does the chemical inhibitor.
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AbstractIris embryos were treated in several ways to study the cause of delayed germination. The results of this work indicate that a chemical inhibitor is present in the endosperm and mechanical inhibition of embryo growth also occurs. The mechanical inhibition reduces excised Iris embryo growth to the same extent as does the chemical inhibitor.
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The Mechanisms of Seed Dormancy
1988In this chapter and the next, the phenomenon of dormancy, as defined on p. 6 and excluding imposed dormancy, will be considered, first of all with respect to the mechanisms of dormancy and secondly by discussing the ways in which dormancy may be broken.
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Regulation of seed dormancy and germination by nitrate
Seed Science Research, 2018Nitrate promotes seed germination at low concentrations in many plant species, and functions as both a nutrient and a signal. As a nutrient, it is assimilated via nitrite to ammonium, which is then incorporated into amino acids.
Lisza Duermeyer +5 more
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1988
Dormancy may be broken as a result of the exposure of the seed to a single factor at the requisite intensity for an appropriate period of time. Germination then follows the breaking of dormancy. Alternatively, dormancy breaking may require or may be accelerated by exposure of the seed to fluctuating conditions, such as diurnal changes of soil ...
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Dormancy may be broken as a result of the exposure of the seed to a single factor at the requisite intensity for an appropriate period of time. Germination then follows the breaking of dormancy. Alternatively, dormancy breaking may require or may be accelerated by exposure of the seed to fluctuating conditions, such as diurnal changes of soil ...
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Nature, 1989
Palaeozoic fossil conifer cones bearing mature seeds with well developed cotyledonary embryos have been recovered from Permo-Carboniferous strata of North America. These are the most ancient embryos ever discovered within gymnosperm seeds1,2. In contrast to the pteridophytic ancestors of seed plants and other major groups of Palaeozoic gymnosperms3,4 ...
Gar W. Rothwell +2 more
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Palaeozoic fossil conifer cones bearing mature seeds with well developed cotyledonary embryos have been recovered from Permo-Carboniferous strata of North America. These are the most ancient embryos ever discovered within gymnosperm seeds1,2. In contrast to the pteridophytic ancestors of seed plants and other major groups of Palaeozoic gymnosperms3,4 ...
Gar W. Rothwell +2 more
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Outlook on Agriculture, 1982
It has long been known that many seeds will not germinate immediately after they have been shed but remain dormant for a considerable time before germination is possible. This article reviews the nature of dormancy and the factors that start and terminate it, with special reference to some of the common weeds of agricultural significance.
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It has long been known that many seeds will not germinate immediately after they have been shed but remain dormant for a considerable time before germination is possible. This article reviews the nature of dormancy and the factors that start and terminate it, with special reference to some of the common weeds of agricultural significance.
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Seed dormancy: General survey of dormancy types in seeds, and dormancy imposed by external agents
1965Two basic kinds of dormancy have been distinguished by Bunning (1947): ectogenous, influenced by external factors such as light, temperature, water, etc.; and endogenous, conditioned by the internal constitution of the seed. Whether seeds possess either one or both of these types of rest depends upon two main factors, environmental influences and ...
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Science, 2018
Plant Science![Figure][1] Seeds of the small mustard plant Arabidopsis thaliana in their pod CREDIT: DENNIS KUNKEL MICROSCOPY/SCIENCE SOURCE Herbivores and an inopportune cold snap can destroy fragile plant seedlings.
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Plant Science![Figure][1] Seeds of the small mustard plant Arabidopsis thaliana in their pod CREDIT: DENNIS KUNKEL MICROSCOPY/SCIENCE SOURCE Herbivores and an inopportune cold snap can destroy fragile plant seedlings.
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1965
The seeds of some plant species are dormant and will not germinate when they are placed in an environment generally conducive to germination, that is to say, in conditions of appropriate warmth, moisture and aeration. In some of these, the embryo must undergo physiological and in some cases morphological changes before germination occurs. These changes
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The seeds of some plant species are dormant and will not germinate when they are placed in an environment generally conducive to germination, that is to say, in conditions of appropriate warmth, moisture and aeration. In some of these, the embryo must undergo physiological and in some cases morphological changes before germination occurs. These changes
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The Control of Seed Dormancy and Germination by Temperature, Light and Nitrate
The Botanical review, 2020An Yan, Zhong Chen
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