Disk and ray achene development and germination characteristics of tansy ragwort (Senecio jacobaea L.)
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Disk and ray achene development and germination characteristics of tansy ragwort (Senecio jacobaea L.) by Ann Louise Baker

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Published .
Written in English

Subjects:

  • Senecio.,
  • Weeds -- Seeds.

Book details:

Edition Notes

Statementby Ann Louise Baker.
ContributionsWashington State University. Dept. of Agronomy and Soils.
The Physical Object
Paginationix, 66 leaves, bound :
Number of Pages66
ID Numbers
Open LibraryOL16540914M

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A b s t r a c t A study on achene macro-and micromorphological characters of the following five Polish species of the Senecio jacobaea group was carried out by LM and SEM: S. aquaticus (var. Maximum germination occurred at 18 DPF in ray and peripheral disk achenes and at 21 DPF in central disk achenes. Neither achene type was shown to have innate dormancy.   The proposal is made that seed scientists need an internationally acceptable hierarchical system of classification for seed dormancy. Further, we suggest that a modified version of the scheme of the Russian seed physiologist Marianna G. Nikolaeva be by: Start studying Grade 7 - Science Test 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Germination -Germination ecology includes two im- portant aspects: the within-year and between-year timing of germination (Venable, ). Seed bank experiments carried out in two populations of Heterosperma have shown that seed banks diminish to zero during the ger- mination season prior to the deposition of fresh achenes (Fig. 4; Venable et. Germination Characteristics of Helianthus maximi- lianai Schrad. and Simsia calva (Engelm. & Gray) Gray D.W. OWENS AND C.A. CALL Abstract Germination characteristics of Maximilian sunflower (Heliun- thus maximiliana Schrad.) and awnless bushsunflower (Simsia c&a Engelm. & Gray) Gray were evaluated at water potentials of. 1. INTRODUCTION. One of the most important processes in the plant natural life cycles is seed germination. For any seeds to initiate the process of germination, they have to imbibe water under favorable environmental conditions (Tobe et al., ).The process is affected by several factors such as temperature variations, oxygen levels, water availability and lack of inhibitory environmental Cited by: 3. germination characteristics and requirements of native trees seeds in the tropics. Temperature affects the germination capacity (germinability), the germination rate, and the distribution of the relative frequency of germination along the incubation time (Labouriau ). Studies of.

Define germination. germination synonyms, germination pronunciation, germination translation, English dictionary definition of germination. germinate germination of a bean seed v. germinated, germinating, germinates v. tr.   For a given weight, the disk achene has a higher probability of germination than the ray achene. With valid germination rules in the form of linear regression equations, the germination potential of achenes may be rapidly estimated from their weights rather than resorting costly and time-consuming germination trials. Impacts (N/A) Publications. Start studying Plants Chapter 7. Learn vocabulary, terms, and more with flashcards, games, and other study tools. showed positive germination responses to smoke and heat shock in experiments of Kenny (), with highest germination recorded when seeds received both smoke and heat treatments. Thus more recent work suggests that Grevillea seeds respond to smoke and heat shock, with most germination occurring if both cues are Size: 70KB.