GENETIC SHIFT IN FINNISH TEPA RED CLOVER FROM SEED GROWN IN CANADA AND THE USA

1972 ◽  
Vol 52 (2) ◽  
pp. 233-240
Author(s):  
OTTO VALLE ◽  
KIRSTI ÄYRÄVÄINEN ◽  
D. A. COOKE ◽  
C. S. GARRISON

Seed lots of the Finnish tetraploid red clover Trifolium pratense L. cult Tepa produced in the USA and Canada were tested in space-planted and solid-seeded trials in Finland to reveal possible changes in cultivar performance that might arise from seed multiplication outside the cultivar’s actual region of adaptation. Despite up to four successive generations of seed increase in the USA, there were, according to the planting-year results of the Finnish trials, only minor changes in the growth type and flowering pattern. In the 2nd year of testing, however, the USA seed lots flowered significantly earlier than the Finnish basic seed lot. The USA seed lots equalled the Finnish-grown ones in winter survival and productivity. The Tepa seed lots from Canada likewise showed only minor cultivar shifts. The seed lots with least change were obtained from Saskatchewan, Canada, and Washington, USA. Since these two areas also produced satisfactory seed yields, they are considered suitable regions for commercial seed production of Tepa.

Author(s):  
В.А. Волошин

В данной статье представлены результаты сравнительной оценки 11 сортов клевера лугового и одного образца-дикороса, проведённой в Пермском НИИ сельского хозяйства в 2018–2019 годах. Все селекционные сорта сформировали полноценные первый и второй укосы или отаву в оба года использования. Дикорастущая форма формировала только один укос, демонстрируя особенность позднеспелого одноукосного типа. Сорта Кретуновский и Ранний 2 показали себя как типичные раннеспелые двухукосные. Другие сорта занимали промежуточное положение. Наибольший сбор сухого вещества обеспечивал образец-дикорос в оба года при крайне различных погодных условиях (1,266 и 1,259 кг/м2 соответственно). Дикорастущая форма и сорт Ранний 2 обеспечивали стабильные урожаи зелёной массы и сухого вещества независимо от возраста и погодных условий. Образец дикорастущего клевера имел более однородный фенотип по сравнению с сортом Пермский местный — стандартом для позднеспелого типа, что указывает на большую генетическую однородность. Согласно всесторонней оценке, включающей степень перезимовки, урожайность зелёной и сухой массы, характер цветения, созревания, формирования и конечный урожай семян, образец-дикорос имеет отличительные признаки позднеспелого (одноукосного) типа и может использоваться в качестве исходного генетического материала для дальнейшей селекции позднеспелых одноукосных сортов клевера лугового, характеризующихся экономически ценными свойствами: высокой устойчивостью к неблагоприятным условиям окружающей среды, высокой и стабильной урожайностью зелёной массы и семян. Исследования будут продолжены с оценкой ряда образцов дикорастущих форм клевера лугового, обнаруженных в 2019 году в природных биоценозах Пермского края. This article deals with the competitive trial of 11 varieties and 1 wild genotype of red clover conducted at the Research Institute of Agriculture in 2018–2019. All the varieties provided good yields of green mass both in the first and second cuts. Wild genotype provided only one cut as long-season one-cut type. “Kretunovskiy” and “Ranniy 2” performed as typical short-season two-cut varieties. Wild genotype produced the highest yield of dry matter (DM) under contrast weather conditions (1.266 and 1.259 kg/m2, respectively). Wild genotype and “Ranniy 2” formed stable yields of green mass and DM regardless of time period and weather. Wild genotype showed homogeneous phenotype compared to “Permskiy mestnyy” — long-season standard variety indicating high genetic uniformity. Such traits as winter hardiness, green and dry mass yields, flowering pattern, seed maturation, formation and production were evaluated. According to this evaluation wild genotype performed as long-season (one-cut) type showing high resistance to unfavorable conditions, high and stable yield of green mass and seeds. Therefore, it can be used a source of economically important traits for future breeding programs of red clover. Further investigations will focus on the evaluation of wild genotypes of red clover found in the Perm region in 2019.


1980 ◽  
Vol 60 (3) ◽  
pp. 1041-1043 ◽  
Author(s):  
W. R. CHILDERS ◽  
W. D. DICKSON

Bytown is a tetraploid cultivar of Trifolium pratense L., developed at the Agriculture Canada Research Station, Ottawa, Ontario. The cultivar has larger leaves, stems and floral parts than its parent Ottawa diploid variety. It has shown greater persistence in Northern areas of Ontario and Quebec and will be used in dairy production as haylage. The SeCan Association will be responsible for seed increase and distribution. It was licensed in March 1979 and pedigree seed will be available to farmers in the spring of 1981.


1977 ◽  
Vol 57 (2) ◽  
pp. 413-418 ◽  
Author(s):  
P. PANKIW ◽  
S. G. BONIN ◽  
J. A. C. LIEVERSE

The effects of various row spacings and seeding rates on seed yield and certain seed yield components, viz, florets per head, seed set, seeds per pod, were studied on single seedings with three successive seed crops of red clover (Trifolium pratense L.), alsike clover (T. hybridum L.), and birdsfoot trefoil (Lotus corniculatus L.). Alsike clover and birdsfoot trefoil produced the highest yields at the narrow 15-cm spacing with successive decreases to the 60-cm spacing. The taller-growing and later-blooming, single-cut red clover was slightly more adaptable to varying spacings with the highest yields at 30- and 45-cm spacings, and slightly lower yields at the 15- and 60-cm spacings. All three crops competed successfully with weeds at the narrow spacings (15 and 30 cm). All three crops were able to compensate within limits in the 2nd and 3rd seed yr for differences in stand caused by different seeding rates. Seeding rates of 2.2 and 4.5 kg/ha were most favorable. Certain components of yield, e.g., florets per inflorescence, percent seed set, and seeds per pod, did not vary within years and are primarily affected by rainfall, soil fertility, pollinator populations and favorable pollinating weather. Differences in seed yields were attributable to total production of flower heads or racemes.


1990 ◽  
Vol 70 (3) ◽  
pp. 869-871 ◽  
Author(s):  
B. R. CHRISTIE ◽  
T. M. CHOO

Effects of harvest time and the growth regulator Alar-85 on seed yield and seed-yield components of red clover (Trifolium pratense L.) were studied. Data were collected from the primary growth (first crop) and from the aftermath (second crop). The second crop outyielded the first crop in one year and yielded the same in another year. Alar-85 shortened corolla tubes in all four cultivars and reduced plant height in three cultivars. It increased seed yields of the second crop of Dollard and Hungaropoli by more than 100%, through increases in seed setting and the number of heads per m2.Key words: Red clover, Trifolium pratense L., seed yield, Alar-85, harvest time


Crop Science ◽  
1965 ◽  
Vol 5 (5) ◽  
pp. 425-428 ◽  
Author(s):  
R. J. Bula ◽  
R. G. May ◽  
C. S. Garrison ◽  
C. M. Rincker ◽  
J. G. Dean

2009 ◽  
Vol 4 (6) ◽  
pp. 1934578X0900400 ◽  
Author(s):  
Aldo Tava ◽  
Daniele Ramella ◽  
Maris Grecchi ◽  
Paolo Aceto ◽  
Renato Paoletti ◽  
...  

The composition of the volatile fraction of two important forage legumes from Italian sub-alpine N.E. pastureland, namely Trifolium pratense L. subsp. pratense (red clover) and T. repens subsp. repens (white clover) were investigated. The volatile oil was obtained from the fresh aerial parts by steam distillation and analyzed by GC/FID and GC/MS. The oil yield was 0.018 and 0.021% (weight/fresh weight basis) for T. pratense and T. repens, respectively. Several classes of compounds were found in both the oils, including alcohols, aldehydes, ketones, terpenes, esters, hydrocarbons, phenolics and acids. Qualitative and quantitative differences were found.


Crop Science ◽  
1968 ◽  
Vol 8 (4) ◽  
pp. 451-454 ◽  
Author(s):  
Norman L. Taylor ◽  
W. A. Kendall ◽  
W. H. Stroube

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