scholarly journals Water uptake, respiration and germination of eastern gamagrass (Tripsacum dactyloides) seeds as influenced by mechanical seed treatments: Unlocking mechanisms of seed dormancy

2019 ◽  
Vol 47 (2) ◽  
pp. 171-185
Author(s):  
W. Huang ◽  
A.G. Taylor
Keyword(s):  
Seed Dormancy ◽  
Water Uptake ◽  
Tripsacum Dactyloides ◽  
Seed Treatments ◽  
Eastern Gamagrass

scholarly journals Effects of Different Pretreatments and Seed Coat on Dormancy and Germination of Seeds of Senna obtusifolia (L.) H.S. Irwin & Barneby (Fabaceae)

2016 ◽  
Vol 8 (2) ◽  
pp. 77
Author(s):  
Stephen I. Mensah ◽  
Chimezie Ekeke
Keyword(s):  
Sulfuric Acid ◽  
Seed Dormancy ◽  
Water Uptake ◽  
Seed Coat ◽  
Critical Factor ◽  
Potassium Nitrate ◽  
Ex Situ ◽  
Mechanical Resistance ◽  
Physical Dormancy ◽  
Senna Obtusifolia

<p class="1Body">The seed dormancy of <em>Senna obtusifolia</em> was investigated through various methods, namely pretreatments in concentrated sulfuric acid, 2% potassium nitrate (KNO<sub>3</sub>), 99% ethanol, 99% methanol, and in hydrogen perioxide; examination of the seed coverings; and the determination of water uptake by the seeds in order to ascertain the most effective technique for breaking dormancy and also determine the dormancy type. The results showed that sulfuric acid treatment recorded the highest germination (100%); followed by 2% hydrogen peroxide treatment (24%) in 15minutes immersion. The methanol and ethanol pretreatments gave 18.33% and 16.5% germinations respectively. Pretreatment in 2% potassium nitrate gave the lowest germination (8.50%), while the intact seeds of <em>S. obtusifiolia</em> (control) gave 0% germination. The anatomy of the seed coat indicated the presence of hard, thickened and specialized cells of cuticle, macrosclereids, osteoscereids, and disintegrated parenchyma layers. The water uptake of intact seeds was low (13.5%) after 24 hr imbibitions. These findings revealed that the seed coat acts as barrier to germination by preventing water absorption, possibly gaseous diffusion in and out of the seed and conferring mechanical resistance to the protrusion of embryo. Pretreatments, such as immersion in H<sub>2</sub>SO<sub>4 </sub>will soften the seed coat and permit germination. Seed dormancy in <em>S. obtusifolia </em>can be considered of physical nature and classified as physical dormancy. The results obtained in this study may serve as useful information in the production and improvement of <em>S. obtusifolia </em>seedlings, as knowledge on seed dormancy and germination is a critical factor and requirements to the understanding of the propagation of this plant either in situ or ex-situ, in view of the economic potentials/attributes of this species.</p>

Release of Seed Dormancy in Field Plantings of Eastern Gamagrass

Crop Science ◽  
2005 ◽  
Vol 45 (2) ◽  
pp. 494-502 ◽  
Author(s):  
Lance R. Gibson ◽  
Ezra Z. Aberle ◽  
Allen D. Knapp ◽  
Kenneth J. Moore ◽  
Roger Hintz
Keyword(s):  
Seed Dormancy ◽  
Eastern Gamagrass

scholarly journals Seed anatomy and water uptake and their relation to seed dormancy of Ormosia paraensis Ducke

2018 ◽  
Vol 40 (3) ◽  
pp. 237-245
Author(s):  
Breno Marques da Silva e Silva ◽  
Camila de Oliveira e Silva ◽  
Fabiola Vitti Môro ◽  
Roberval Daiton Vieira
Keyword(s):  
Sulfuric Acid ◽  
Seed Dormancy ◽  
Water Uptake ◽  
Furniture Industry ◽  
Palisade Layer ◽  
Dormancy Breaking ◽  
Physical Dormancy ◽  
Seed Physiology ◽  
Breaking Dormancy ◽  
Hydrophobic Substances

Abstract: Ormosia paraensis Ducke has ornamental seeds widely used in the manufacture of bio-jewels and wood used in the furniture industry. For seedling production, the information on its seed physiology is scarce. Thus, the aim of this study was to assess methods for breaking dormancy and relate them to integument structure and water uptake by O. paraensis seeds. Seed dormancy-breaking was performed by mechanical scarification and soaking in sulfuric acid for 0, 15, 30, 60, 120, and 240 minutes. Dormancy‐broken seeds were compared with intact seeds. Seed integument is formed by a cuticle (hydrophobic substances), epidermis (macroesclereids of the palisade layer,), hypodermis (osteosclereids), and parenchyma cells. Intact seeds did not absorb water after 72 hours of soaking. The highest percentages and rates of seed germination were observed in treatments with mechanical scarification and soaking in sulfuric acid for 60 or 120 minutes. Seed soaking in sulfuric acid (H2SO4 p.a. 98.08%) for 60 or 120 minutes or mechanical scarification are adequate to overcome physical dormancy associated with O. paraensis seed integument impermeability to water or gases.

Tripsacum dactyloides (Eastern gamagrass)

2019 ◽  
pp. 2583-2583
Author(s):  
K. Subramanya Sastry ◽  
Bikash Mandal ◽  
John Hammond ◽  
S. W. Scott ◽  
R. W. Briddon
Keyword(s):  
Tripsacum Dactyloides ◽  
Eastern Gamagrass

Seed dormancy, germination and fungal infestation of eastern gamagrass seed

2017 ◽  
Vol 99 ◽  
pp. 109-116 ◽  
Author(s):  
Wencheng Huang ◽  
Hilary S. Mayton ◽  
Masoume Amirkhani ◽  
Decheng Wang ◽  
Alan G. Taylor
Keyword(s):  
Seed Dormancy ◽  
Eastern Gamagrass

Co-segregation of the gynomonoecious sex form1 gene (gsf1) of Tripsacum dactyloides (Poaceae) with molecular markers

Genome ◽  
1994 ◽  
Vol 37 (5) ◽  
pp. 809-812 ◽  
Author(s):  
C. A. Blakey ◽  
C. L. Dewald ◽  
E. H. Coe
Keyword(s):  
Molecular Markers ◽  
Molecular Marker ◽  
Single Gene ◽  
Female Parent ◽  
Tripsacum Dactyloides ◽  
Eastern Gamagrass ◽  
Polymorphism Data ◽  
High Degree ◽  
Form Variant ◽  
Linkage Relationships

The only monogenic trait in Tripsacum to date was first identified in the prolific sex form variant Tripsacum dactyloides (L.) L. forma prolificum Dayton et Dewald. The expression of this trait is controlled by the presence of a single-gene, recessive pistillate mutation hereby designated the gynomonoecious sex form1 gene (gsf1), after the registered plant germplasm accession GSF-I (PI483447) from which it was first identified. This trait confers a high degree of feminization to the primarily male floral structure of the Tripsacum rachis. Two molecular markers were found to co-segregate with the gsf1 gene in a diploid (2n = 36) F2 population of Tripsacum dactyloides, where the female parent (GSF-I) had been previously determined to be homozygous recessive for the gene. Phenotypic scoring data were compared with restriction fragment length polymorphism data and linkage relationships were determined. The gsf1 gene is located ~7 cM from tda48, a Tripsacum-derived molecular marker, and ~9 cM from npi286, a maize-derived molecular marker. The marker npi286 also maps within ~5 cM of the tassel seed2 locus (ts2) of maize, which confers a similar change in the inflorescence of the maize tassel.Key words: Tripsacum, gsf1, Eastern gamagrass, ts2, maize.

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