Simultaneous selection for seed and forage production in cocksfoot (Dactylis glomerata ): application of drought tolerance and susceptibility indices

2016 ◽  
Vol 72 (3) ◽  
pp. 441-453 ◽  
Author(s):  
M. M. Majidi ◽  
B. Hoseini ◽  
M. Barati ◽  
A. Mirlohi ◽  
B. Araghi
Keyword(s):  
Drought Tolerance ◽  
Dactylis Glomerata ◽  
Forage Production ◽  
Simultaneous Selection ◽  
Selection For

Growth traits associated with drought survival, recovery and persistence of cocksfoot (Dactylis glomerata) under prolonged drought treatments

2019 ◽  
Vol 70 (1) ◽  
pp. 85 ◽  
Author(s):  
M. Abdollahi Bakhtiari ◽  
F. Saeidnia ◽  
M. M. Majidi ◽  
A. Mirlohi
Keyword(s):  
Drought Tolerance ◽  
Deficit Irrigation ◽  
Growth Traits ◽  
Dactylis Glomerata ◽  
Forage Production ◽  
Prolonged Drought ◽  
Drought Recovery ◽  
Seed Management ◽  
Drought Survival ◽  
Dactylis Glomerata L

The effect of prolonged drought treatments on persistence, growth traits, drought survival and post-drought recovery was investigated in two sets of differently managed genotypes of cocksfoot (Dactylis glomerata L.). In total, 72 genotypes (two sets of 36 managed for seed and forage harvest, respectively) were evaluated for agro-morphological traits in the field during 2013–15 under normal and deficit irrigation regimes. In the fourth year (2016), irrigation was withheld in both irrigation treatments for 2 months and then plants were re-watered to investigate the effect of prolonged drought regimes on traits related to post-drought recovery. The deficit irrigation regime decreased persistence and recovery. These reductions were lower in the seed-management than the forage set, which indicates that delaying the first harvest of the seed-management treatment to maximise seed production led to lower impact of drought stress. The seed-management treatment also had lower persistence. The forage-management treatment had higher recovery under normal irrigation, whereas under deficit irrigation, the seed-management treatment had higher recovery. Association analysis showed the possibility of selecting genotypes having high values of persistence and drought tolerance. Results also showed a negative correlation between days to flowering and recovery after drought, indicating that selection for earliness may improve survivability and persistence of these plants. Superior genotypes with higher forage production and better recovery, persistence and drought tolerance may be recommended for development of synthetic cultivars.

Mapping a gene conferring resistance to Pseudocercosporella herpotrichoides on chromosome 4V of Dasypyrum villosum in a wheat background

Genome ◽  
1998 ◽  
Vol 41 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Ahmet Yildirim ◽  
Stephen S Jones ◽  
Timothy D Murray
Keyword(s):  
Distal Part ◽  
Dominant Gene ◽  
Rflp Markers ◽  
Addition Line ◽  
Dasypyrum Villosum ◽  
Pseudocercosporella Herpotrichoides ◽  
Eyespot Resistance ◽  
Double Recombination ◽  
Simultaneous Selection ◽  
Selection For

The objectives of this study were to map and tag the previously undescribed eyespot resistance gene PchDv on chromosome 4V of Dasypyrum villosum in a wheat background. The 82 F2 plants used for mapping were produced from a cross between a susceptible\i wheat 'Yangmai-5' (4V(4D)) substitution line and a resistant wheat 'Chinese Spring' disomic addition line of chromosome 4V of D. villosum. Segregation for resistance and susceptibility among F2 plants was 3:1, indicating that resistance was controlled by a single dominant gene. PchDv mapped to the distal part of chromosome 4V and was bracketed by two RFLP markers, Xcdo949 and Xbcd588, in a 33-cM interval. This distance could not be reduced, owing to a lack of polymorphic loci in this region. Theoretically, double recombination in this region occurs in 3.3% of the individuals; therefore, 96.7% of the selected genotypes would have PchDv, with simultaneous selection for both flanking markers. Double recombination between the flanking markers was observed in 2 out of 82 (2.4%) F2 individuals.

Simultaneous selection for high yield and stability in common bean (Phaseolus vulgaris) genotypes

2002 ◽  
Vol 138 (3) ◽  
pp. 249-253 ◽  
Author(s):  
F. MEKBIB
Keyword(s):  
Common Bean ◽  
Genotype By Environment Interaction ◽  
Yield Stability ◽  
High Yield ◽  
Environment Interaction ◽  
Yield Performance ◽  
Simultaneous Selection ◽  
Selection For ◽  
Stability Statistics ◽  
Selection Of

Phenotypic yield stability is a trait of special interest for plant breeders and farmers. This value can be quantified if genotypes are evaluated in different environments. Common bean is the main cash crop and protein source of farmers in many lowland and mid-altitude areas of Ethiopia. An experiment was undertaken to evaluate common bean genotypes for yield performance at Alemaya, Bako and Nazreth in Ethiopia for 3 years. The yield performance of genotypes was subjected to stability analysis and yield-stability statistics were generated to aid the selection of genotypes that were high yielding and very stable. The significant genotype by environment interaction indicated that the relative performance of the varieties altered in the different environments. Genotype yield performance varied ranging from 1511–2216 kg/ha. Simultaneous selection for yield and yield-stability statistics using YS(i) statistics indicated that A 410, GLP x92, Mx-2500-19, G 2816, A-195, 997-CH-1173, Diacol calima, ICA 15541 and AND 635 were both high yielding and stable. Following this study, using farmers’ evaluation and other criteria, GLP x92 and G-2816 were identified as preferred genotypes and were released for further production.

scholarly journals Simultaneous selection for dominant and recessive mutants

Heredity ◽  
1965 ◽  
Vol 20 (1) ◽  
pp. 142-144 ◽  
Author(s):  
J W James
Keyword(s):  
Simultaneous Selection ◽  
Selection For

AC Nordic orchardgrass (Dactylis glomerata L.)

1993 ◽  
Vol 73 (3) ◽  
pp. 845-846 ◽  
Author(s):  
A. R. McElroy
Keyword(s):  
Key Words ◽  
Stem Rust ◽  
Dactylis Glomerata ◽  
Research Centre ◽  
Mass Selection ◽  
Puccinia Graminis ◽  
Plant Research ◽  
Selection For ◽  
Dactylis Glomerata L

AC Nordic is a late-maturing orchardgrass (Dactylis glomerata L.) cultivar. It was developed by mass selection for yield, persistence and resistance to stem rust (Puccinia graminis) at the Plant Research Centre, Agriculture Canada, Ottawa. Its yield was similar to that of cv. Sumas in a total of 33 station years in Quebec. Yield in second and subsequent production years was 101.6% of cv. Sumas over 19 station years. Key words: Dactylis glomerata L., orchardgrass

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