scholarly journals EFFECT OF SOME PRE-SOWING TREATMENTS AND SEED AGE ON GERMINATION OF Seaforthia elegans L., PALM SEEDS

2009 ◽  
Vol 14 (3) ◽  
pp. 507-521
Author(s):  
Amal Nasr
Keyword(s):  
Seed Age

scholarly journals Potential Propagation by Seed and Cuttings of the Azorean NativeCalluna vulgaris(L.) Hull

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Maria João Pereira ◽  
Helena Fagundo ◽  
Tiago Menezes ◽  
João Couto
Keyword(s):  
Room Temperature ◽  
Seed Storage ◽  
Calluna Vulgaris ◽  
Landscape Conservation ◽  
Wild Populations ◽  
Surface Sterilization ◽  
Cultural Conditions ◽  
Germination Characteristics ◽  
Seed Age ◽  
Natural Stands

This work investigates the potential propagation by seed and cuttings of the Azorean nativeCalluna vulgaris(L.) Hull. for landscape conservation. With that purpose we have performed several germination and cuttings trials, using plant material from wild populations of this species. In the germination trials, we tested the effects of photoperiod length (8 and 16 h), temperature (10, 15, 20, and 20–10°C), seed age (6, 108, and 270 days), temperature of seed storage (4°C and room temperature), and seed surface sterilization on the germination characteristics. In the cuttings trials, we tested the effects of stem cutting type, cultural conditions, cuttings’ harvest month, and rooting substrates on the rooting percentages. The best percentages of germination, 93 and 90%, were obtained with fresh seeds and surface sterilized and sown under an 8 h photoperiod and with temperatures of 10°C or 15°C, respectively; germination after seed storage during 270 days is significantly superior (71%) when seeds are stored at 4°C. The best percentages of rooting were achieved for straight (96%) or heel cuttings (90%) harvested in March, planted on soil from natural stands ofC. vulgarisandErica azoricaHochst., outdoors in half shade, and partially covered with transparent polyethylene film.

Soybean seed vigour and field emergence under influence of cultivar, seed age and planting date

2007 ◽  
Vol 35 (2) ◽  
pp. 177-180 ◽  
Author(s):  
Luka Andric ◽  
Tihana Teklic ◽  
Marija Vrataric ◽  
Aleksandra Sudaric ◽  
Vinko Duvnjak
Keyword(s):  
Soybean Seed ◽  
Planting Date ◽  
Seed Vigour ◽  
Seed Age ◽  
Field Emergence

Dormancy Variations in Common Purslane Seeds

Weed Science ◽  
1974 ◽  
Vol 22 (6) ◽  
pp. 535-540 ◽  
Author(s):  
G. H. Egley
Keyword(s):  
Water Content ◽  
Seed Viability ◽  
High Water ◽  
High Water Content ◽  
Water Imbibition ◽  
Immature Seeds ◽  
Seed Age ◽  
Common Purslane ◽  
Black Seeds ◽  
Mature Seeds

Common purslane (Portulaca oleraceaL.) seeds, produced by the same plants, had different degrees of dormancy. The dormancy variations were caused neither by low seed viability nor by location on the plant where seeds were produced. Seed water content and seed age at time of collection contributed to, but were not solely responsible for, the dormancy variations. Immature, brown seeds of high water content were less dormant than the more mature, black seeds of low water content. The immature seeds germinated better in the dark than did the more mature seeds. A puncture in the seed, over the radicle, broke purslane dormancy. Dormancy was not caused by blockage of water imbibition by seeds. Purslane dormancy developed during later stages of seed maturation on the mother plant.

Effects of seed age and seeding depth on growth of Stipa lagascae R. & Sch. seedlings

2006 ◽  
Vol 65 (4) ◽  
pp. 682-687 ◽  
Author(s):  
A. Ouled Belgacem ◽  
M. Neffati ◽  
V.P. Papanastasis ◽  
M. Chaieb
Keyword(s):  
Seed Age ◽  
Stipa Lagascae

Role of mucilage in seed dispersal and germination of the annual ephemeral Alyssum minus (Brassicaceae)

2012 ◽  
Vol 60 (5) ◽  
pp. 439 ◽  
Author(s):  
Ying Sun ◽  
Dun Y. Tan ◽  
Carol C. Baskin ◽  
Jerry M. Baskin
Keyword(s):  
Water Stress ◽  
Seed Dispersal ◽  
Incubation Temperature ◽  
Water Reservoir ◽  
Soil Surface ◽  
Moisture Stress ◽  
West China ◽  
North West ◽  
Seed Age

Seeds of Alyssum minus, an annual ephemeral in shrublands of north-west China, can produce a large amount of mucilage. The primary aim of this study was to explore the role of mucilage in seed dispersal, settlement onto the soil surface and germination of this species. Width of imbibed seeds with mucilage was three times greater than that of seeds without mucilage, and mass of mucilage increased 167 times after imbibition. Expanded dry mucilage significantly increased wind dispersal of seeds. Floating time on water was greatest for seeds without mucilage, and adherence of soil particles to seeds was greater for seeds with mucilage than for those without mucilage. Mucilage increased rate of water uptake and decreased rate of water loss, and it significantly decreased germination of 0- and 4-week-old seeds. Gibberellic acid promoted germination of 0- and 4-week-old seeds with and without mucilage, but its effect depended on seed age and incubation temperature. Seeds with mucilage subjected to water stress during imbibition and/or incubation germinated faster than those without mucilage. Presence of mucilage on seeds during imbibition significantly increased germination percentages under increased water stress, a first report of this phenomenon. The study has shown that the mucilage of A. minus plays an important role in seed dispersal, seed adhesion to soil (thereby minimising removal by water and predators), seed hydration via increasing surface contact with the substrate, and can serve as a water reservoir for germination, especially under moisture stress.

Intermediate complex morphophysiological dormancy in the endemic Iberian Aconitum napellus subsp. castellanum (Ranunculaceae)

2010 ◽  
Vol 20 (2) ◽  
pp. 109-121 ◽  
Author(s):  
José M. Herranz ◽  
Miguel Á. Copete ◽  
Pablo Ferrandis ◽  
Elena Copete
Keyword(s):  
Seed Germination ◽  
Population Level ◽  
Intermediate Complex ◽  
Cold Stratification ◽  
Morphophysiological Dormancy ◽  
Seed Age ◽  
Aconitum Napellus ◽  
Radicle Emergence ◽  
The Mean ◽  
Embryo Length

AbstractSeeds of Aconitum napellus subsp. castellanum were physiologically dormant at maturity in early autumn, with underdeveloped embryos. Thus they have morphophysiological dormancy (MPD). Embryos in fresh seeds were on average 1.01 mm long, and they had to grow to 3.60 mm before radicle emergence. Cold stratification at 5°C for 5 months with light enhanced the mean embryo length to 2.73 mm (SE = 0.13) and seed germination to 20%. However, with higher temperatures (15/4, 20/7, 25/10, 28/14 and 32/18°C) embryo growth was small, with no seeds germinating. Optimal germination was achieved after 4 months of cold stratification at 5°C followed by incubation at 20/7°C for 1 month with light, when germination ranged between 70 and 79%, depending on seed age, locality and year of collection. Cold stratification could be substituted by the application of GA3 solution, since mean embryo length in seeds incubated at 25/10°C for 1 month with light was 3.52 mm and the germination was 80%. Since cold stratification was the only requirement for the loss of MPD, the longest embryo growth occurred during this treatment, and GA3 promoted MPD loss, we concluded that A. napellus seeds have intermediate complex MPD. Germination was higher in 4-month stored than in freshly matured seeds. A pronounced variability in germinative patterns at inter-annual and inter-population level was recorded.

Seed Age and Salt Tolerance at Germination in Alfalfa 1

Crop Science ◽  
1987 ◽  
Vol 27 (5) ◽  
pp. 1053-1056 ◽  
Author(s):  
S. E. Smith ◽  
A. K. Dobrenz
Keyword(s):  
Salt Tolerance ◽  
Seed Age
Sign in / Sign up

Export Citation Format

Share Document