Recurrent Selection for Glyphosate Tolerance in Birdsfoot Trefoil

Crop Science ◽  
1991 ◽  
Vol 31 (5) ◽  
pp. 1124-1129 ◽  
Author(s):  
C. M. Boerboom ◽  
N. J. Ehlke ◽  
D. L. Wyse ◽  
D. A. Somers
Keyword(s):  
Recurrent Selection ◽  
Birdsfoot Trefoil ◽  
Glyphosate Tolerance ◽  
Selection For

OAC Bright birdsfoot trefoil

1997 ◽  
Vol 77 (2) ◽  
pp. 251-253 ◽  
Author(s):  
B. E. Twamley ◽  
D. T. Tomes ◽  
S. R. Bowley
Keyword(s):  
Key Words ◽  
Seed Yield ◽  
Recurrent Selection ◽  
Lotus Corniculatus ◽  
Birdsfoot Trefoil ◽  
Science Department ◽  
Seedling Vigour ◽  
Herbage Yield ◽  
Cultivar Description ◽  
Selection For

OAC Bright is a birdsfoot trefoil (Lotus corniculatus L.) cultivar developed by the Crop Science Department, University of Guelph. It was developed by within and among half-sib progeny recurrent selection for seedling vigour and seed yield. OAC Bright has 2% higher seedling vigour and 0.8% higher herbage yield than Leo. It has similar maturity and persistence to Leo. Key words: Birdsfoot trefoil, cultivar description, seedling vigour, seed yield, recurrent selection

Increased Glyphosate Tolerance in ‘Aurora Gold’ Hard Fescue (Festuca longifolia)

2005 ◽  
Vol 19 (3) ◽  
pp. 640-646 ◽  
Author(s):  
Stephen E. Hart ◽  
Jeffrey F. Derr ◽  
Darren W. Lycan ◽  
Crystal Rose-Fricker ◽  
William A. Meyer
Keyword(s):  
New Jersey ◽  
Weed Management ◽  
Recurrent Selection ◽  
Management Program ◽  
Environmental Benefits ◽  
Golf Course ◽  
Glyphosate Tolerance ◽  
Phenotypic Recurrent Selection ◽  
Stand Thinning ◽  
Selection For

Studies were conducted in New Jersey and Virginia to evaluate the response of ‘Aurora Gold’ hard fescue, which had undergone five cycles of phenotypic recurrent selection for increased glyphosate tolerance, to direct applications of glyphosate. ‘Discovery’ hard fescue, which had not undergone recurrent selection, was also included in the study. Glyphosate treatments were initiated in early/mid-May and applied once, twice, or three times at 4- to 5-wk intervals at rates ranging from 0.1 to 1.6 kg ae/ha. Aurora Gold was more tolerant to glyphosate than Discovery in all experiments, indicating that recurrent selection was successful in increasing glyphosate tolerance in hard fescue. Single applications of glyphosate at rates ranging from 0.6 to 0.8 kg/ha could be applied to Aurora Gold with minimal injury or stand thinning (<20%), whereas multiple applications of glyphosate could be applied at rates ranging from 0.4 to 0.6 kg/ha. The use of Aurora Gold in areas planted to hard fescue, such as golf course roughs, vineyards, orchards, and landscapes, would allow the integration of direct glyphosate applications into an overall weed management program providing potential economic and environmental benefits.

RECURRENT SELECTION FOR SEED YIELD IMPROVEMENT IN LOTUS CORNICULATUS, CULT LEO

1973 ◽  
Vol 53 (4) ◽  
pp. 811-815 ◽  
Author(s):  
G. S. SANDHA ◽  
B. E. TWAMLEY
Keyword(s):  
Seed Yield ◽  
Recurrent Selection ◽  
No Reduction ◽  
Lotus Corniculatus ◽  
Birdsfoot Trefoil ◽  
Phenotypic Method ◽  
Coefficient Of Variability ◽  
Selection For ◽  
Phenotypic Methods ◽  
Seed Yields

Birdsfoot trefoil (Lotus corniculatus L.), cult Leo, was used as a base population for a recurrent selection program for seed yield. Objectives were: (1) improvement of seed yield, and (2) comparison of a genotypic and a geno-phenotypic method of selection. Two cycles were completed and evaluated. Seed yields for the genotypic and geno-phenotypic methods were 132 and 158%, respectively, of Leo after two cycles of selection. The geno-phenotypic method proved superior to the genotypic after each cycle. The broad sense heritability (61% for cycles 1 and 2), genotypic standard deviation, and genotypic coefficient of variability estimates (16.9 and 15.0% for cycles 1 and 2) indicated no reduction in genotypic variability with the geno-phenotypic method. However, the variability was practically exhausted with the genotypic method after cycle 2. Thus, further improvement with additional cycles of selection should be possible with the geno-phenotypic method but not with the genotypic method.

SELECTION METHODS FOR SEEDLING VIGOR IN BIRDSFOOT TREFOIL

1971 ◽  
Vol 51 (3) ◽  
pp. 229-235 ◽  
Author(s):  
B. E. TWAMLEY
Keyword(s):  
Recurrent Selection ◽  
Birdsfoot Trefoil ◽  
Seedling Vigor ◽  
Open Pollination ◽  
Selection Methods ◽  
Genotype Group ◽  
Progeny Tests ◽  
Selection For

In 1969, 72 large-seeded lines derived through open pollination were used to establish a seedling vigor test upon which three selection schemes were imposed. First, the best 16 lines were identified and their maternal parents intercrossed to form a selection-by-genotype group. Second, vigorous seedlings were selected out of every fourth line, brought to bloom and interpollinated to form a selection-by-phenotype group. Third, from each of the 16 best lines four vigorous seedlings were selected and later intercrossed to form a selection-by-geno-phenotype group. Using the seeds produced, progeny tests were established to evaluate the germplasm selected by the three methods. The genotype method was effective, straightforward, and reasonably reliable. The geno-phenotype method was more variable in results but potentially more rewarding. The phenotype method was the least desirable. The implications of these results in a program of recurrent selection for seedling vigor are discussed.

Improvement of effectiveness in maize breeding

2006 ◽  
Vol 54 (3) ◽  
pp. 351-358 ◽  
Author(s):  
P. Pepó
Keyword(s):  
Recurrent Selection ◽  
Genetic Manipulation ◽  
Field Testing ◽  
Tissue Cultures ◽  
Maize Breeding ◽  
Breeding Programmes ◽  
Speed Up ◽  
Selection For

Plant regeneration via tissue culture is becoming increasingly more common in monocots such as maize (Zea mays L.). Pollen (gametophytic) selection for resistance to aflatoxin in maize can greatly facilitate recurrent selection and the screening of germplasm for resistance at much less cost and in a shorter time than field testing. In vivo and in vitro techniques have been integrated in maize breeding programmes to obtain desirable agronomic attributes, enhance the genes responsible for them and speed up the breeding process. The efficiency of anther and tissue cultures in maize and wheat has reached the stage where they can be used in breeding programmes to some extent and many new cultivars produced by genetic manipulation have now reached the market.

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