Hard-seed content of alfalfa grown in Canada

1991 ◽  
Vol 71 (2) ◽  
pp. 437-444 ◽  
Author(s):  
D. T. Fairey ◽  
L. P. Lefkovitch
Keyword(s):  
British Columbia ◽  
Geographic Location ◽  
Viable Seed ◽  
Hard Seed ◽  
Peace River ◽  
Seed Content ◽  
River Region ◽  
Hard Seeds ◽  
Viable Seeds ◽  
Production Areas

The hard-seed content of alfalfa (Medicago spp.) grown in Canada in relation to genotype and geographic location of production was surveyed for the commercial growing regions in Manitoba, Saskatchewan, Alberta and British Columbia. The average hard-seed content of all pedigreed production over a 5-yr period, ranged from 22 to 37% and that in nonpedigreed production was between 14 and 30%. A database of the five widely grown cultivars revealed that the hard-seed content of alfalfa in the most northerly growing areas in the Peace River region of Alberta and British Columbia ranged from 31 to 51%, while hard seed content of alfalfa produced elsewhere varied from 22 to 38%. There was no apparent effect of latitude on the proportion of hard seeds, while there was a small increase for two of the five cultivars in production areas further west. Of particular interest was the trend in viable seed production. There was consistent evidence suggesting that the proportion of viable seeds decreased in production areas further north, but increased in production areas further west. However, the minimum viability was always in excess of 85%. There was no correlation between hard and viable seed. Key words: Medicago spp., alfalfa, lucerne, hard seeds, viable seeds

The viable seed content of some forest soil in coastal British Columbia

1970 ◽  
Vol 48 (7) ◽  
pp. 1383-1385 ◽  
Author(s):  
M. C. Kellman
Keyword(s):  
British Columbia ◽  
Forest Soil ◽  
Surface Soil ◽  
Coniferous Forest ◽  
Alnus Rubra ◽  
Viable Seed ◽  
Seed Content ◽  
Viable Seeds ◽  
Coastal British Columbia

The upper 10 cm of surface soil and litter beneath a coniferous forest in coastal British Columbia was found to contain over 1000 viable seeds per square meter. Alnus rubra Bong. made up 68.9% of all viable seed, although 18 other species, mainly weedy and secondary types, were recorded.

scholarly journals Butterflies of the Peace River Region of Alberta and British Columbia

Blue Jay ◽  
1994 ◽  
Vol 52 (2) ◽  
Author(s):  
Norbert G. Kondla ◽  
Edward M. Pike ◽  
Felix A. H. Sperling
Keyword(s):  
British Columbia ◽  
Peace River ◽  
River Region

Ancient DNA reveals northwest range extension of Richardson’s ground squirrel (Urocitellus richardsonii) into northeastern British Columbia, Canada, during the Late Pleistocene

2020 ◽  
Vol 57 (7) ◽  
pp. 855-866
Author(s):  
Thomas C.A. Royle ◽  
Dongya Y. Yang ◽  
Jonathan C. Driver
Keyword(s):  
British Columbia ◽  
Ancient Dna ◽  
Ground Squirrel ◽  
Mitochondrial Control Region ◽  
Archaeological Site ◽  
Ground Squirrels ◽  
Vegetation Communities ◽  
Peace River ◽  
River Region ◽  
Urocitellus Richardsonii

Ancient DNA was extracted from 12 500 to 10 500 year old ground squirrel bones from Tse’K’wa, an archaeological site in the Peace River region of northeastern British Columbia, Canada. Analysis of mitochondrial DNA from seven individuals demonstrates that all are Urocitellus richardsonii (Richardson’s ground squirrel), a species not found in the region today. Phylogenetic and sequence analyses indicate these individuals share a previously undocumented mitochondrial control region haplotype that is most closely related to haplotypes observed in modern specimens from Saskatchewan and Montana. At the end of the Pleistocene these ground squirrels extended their range north and west into open vegetation communities that developed when ice sheets melted and glacial lakes drained. They were subsequently extirpated from the Peace River region when forests replaced earlier pioneering vegetation communities.

scholarly journals First year seed softening in three Hedysarum spp. in southern Queensland

2003 ◽  
Vol 43 (11) ◽  
pp. 1303 ◽  
Author(s):  
L. W. Bell ◽  
D. L. Lloyd ◽  
K. L. Bell ◽  
B. Johnson ◽  
K. C. Teasdale
Keyword(s):  
Soil Surface ◽  
First Year ◽  
Hard Seed ◽  
Seed Content ◽  
Constant Rate ◽  
Significant Difference ◽  
Hard Seeds ◽  
Hedysarum Coronarium ◽  
Seed Characteristics ◽  
Selection Of

Seed softening was investigated in 41 lines of Hedysarum coronarium, 5 lines of H. carnosum and 8�lines of H. flexuosum grown at Oakey, Queensland in 2000. After testing for initial hard seed content in each line, the remaining hard seeds were placed on the soil surface at Kingsthorpe on 15 January 2001. Changes in hard seed levels over the ensuing summer-autumn seed softening period were measured. The initial hard seed content in each species ranged from 20 to 79% in H. coronarium; 31 to 79% in H. carnosum; and 54 to 83% in H. flexuosum. No significant difference in the time of seed softening between accessions or species was identified. Despite the similar timing, the extent of softening varied greatly between accessions and species. The proportion of initially hard seed that softened ranged from 54 to 95% in H. coronarium; 27 to 45% in H. carnosum; and 50 to 74% in H. flexuosum. Accessions of H. coronarium and H. flexuosum softened the greatest proportion of seed between 15 January and 22�February with reducing amounts thereafter. Accessions of H. carnosum softened less seed over this period, appearing to display a slower, more constant rate of softening. Although total hard seed levels were relatively low, there was sufficient variability in hard seed levels to provide some scope for selection of desired hard seed characteristics.

Jackson barley

1995 ◽  
Vol 75 (1) ◽  
pp. 207-208
Author(s):  
R. I. Wolfe ◽  
D. G. Faris ◽  
J. G. N. Davidson ◽  
P. J. Clarke
Keyword(s):  
British Columbia ◽  
Hordeum Vulgare ◽  
Research Centre ◽  
Hordeum Vulgare L ◽  
Early Maturity ◽  
Peace River ◽  
River Region ◽  
Early Maturing ◽  
Cultivar Description ◽  
The Cross

Jackson (Hordeum vulgare L.) is an early-maturing, hulled, six-row feed barley. It was developed at the Northern Agriculture Research Centre, Beaverlodge, Alberta from the cross BT607/Pomo. It is short in height, moderately strong strawed, and adapted to western Alberta and the Peace River region of British Columbia. Key words:Hordeum vulgare, barley, early maturity, cultivar description

scholarly journals Self fertility of pear varieties conditioned by natural self pollination (autogamy)

2000 ◽  
Vol 6 (1) ◽  
Author(s):  
J. Nyéki ◽  
M. Soltész ◽  
J. Iváncsics
Keyword(s):  
Fruit Set ◽  
Experimental Period ◽  
Gene Bank ◽  
Viable Seed ◽  
Ecological Conditions ◽  
Self Pollination ◽  
Seed Content ◽  
Viable Seeds ◽  
Number Of Seeds

Authors studied the autofertility depending on natural self pollination (autogamy) in 59 pear cultivars during 4 seasons at three locations with different ecological conditions (Helvetia, Kecskemet-Kisfai, Keszthely). The aim of the experiments was to determine the autogamous tendencies of varieties hitherto unexplored in the Hungarien gene bank, or to check data found in the literature. A total of 42616 isolated pear flowers produced 1.2% fruits with at least one viable seed in each. The 59 varieties observed did not set fruit by autogamy on either of the three sites during the four years of the study. The triploid (3n=51) varieties were entirely self-sterile. According to the highest autogamous fruit set, during the experimental period, the varieties have been assigned to four groups: (1) Entirely auto-incompatible (0% fruit set), (2) auto-incompatible (0.1 to 0.9%), slightly self fertile (1.1 to 5%) and (4) self fertile (5.1 to 10%). According to the number of viable seeds per fruit resulting from autogamy, the varieties are assigned to three groups as (1) low seed content (less than 3 seeds per fruit), medium (3.1 to 5) and (3) high (more than 5 seeds). Thus, the assessment of the number of seeds per fruit resulting from autogamy is indispensable as a proof of the absence of parthenocarpy.

scholarly journals Trade of commercial potting substrates: A largely overlooked means of the long-distance dispersal of plants

2021 ◽  
Author(s):  
Judit Sonkoly ◽  
Attila Takács ◽  
Attila Molnár V. ◽  
Péter Török
Keyword(s):  
Plant Species ◽  
Large Scale ◽  
Long Distance Dispersal ◽  
Viable Seed ◽  
Long Distance ◽  
Ecological Processes ◽  
Number Of Species ◽  
Seed Content ◽  
Wide Range ◽  
Viable Seeds

AbstractAlthough long-distance dispersal (LDD) events are considered to be rare and highly stochastic, they are disproportionately important and drive several large-scale ecological processes. The realisation of the disproportionate importance of LDD has led to an upsurge in studies of this phenomenon; yet, we still have a very limited understanding of its frequency, extent and consequences. Humanity intentionally spreads a high number of species, but a less obvious issue is that it is associated with the accidental dispersal of other plant species. Although the global trade of potted plants and horticultural substrates is capable of dispersing large quantities of propagules, this issue has hardly been studied from an ecological point of view. We used the seedling emergence method to assess the viable seed content of different types of commercial potting substrates to answer the following questions: (i) In what richness and density do substrates contain viable seeds? (ii) Does the composition of substrates influence their viable seed content? and (iii) Are there common characteristics of the species dispersed this way? We detected altogether 438 seedlings of 66 taxa and found that 1 litre of potting substrate contains an average of 13.27 seeds of 6.24 species, so an average 20-litre bag of substrate contains 265 viable seeds. There was a high variability in the seed content of the substrates, as substrates containing cattle manure contained a substantially higher number of species and seeds than substrates without manure. Based on this, this pathway of LDD is an interplay between endozoochory by grazing livestock and accidental human-vectored dispersal, implying that the diet preference of grazing animals largely determines the ability of a plant species to be dispersed this way. According to our results, potting substrates can disperse large quantities of seeds of a wide range of plant species, moreover, these dispersal events occur on very long distances in almost all cases. We conclude that this kind of human-vectored LDD may have complex effects on plant populations and communities; however, as this dispersal pathway is largely understudied and has hardly been considered as a type of LDD, its consequences are still largely unknown and further studies of the issue are of great importance.

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