Correlated responses in forage yield and nutritional value from phenotypic recurrent selection for reduced fiber concentration in smooth bromegrass

1999 ◽  
Vol 99 (7-8) ◽  
pp. 1245-1254 ◽  
Author(s):  
M. D. Casler
Keyword(s):  
Nutritional Value ◽  
Recurrent Selection ◽  
Forage Yield ◽  
Correlated Responses ◽  
Smooth Bromegrass ◽  
Fiber Concentration ◽  
Phenotypic Recurrent Selection ◽  
Selection For

RECURRENT SELECTION FOR FORAGE AND SEED YIELD IN ZIGZAG CLOVER

1984 ◽  
Vol 64 (1) ◽  
pp. 119-130 ◽  
Author(s):  
NORMAN L. TAYLOR ◽  
PAUL L. CORNELIUS ◽  
ROY E. SIGAFUS
Keyword(s):  
Recurrent Selection ◽  
Selection Process ◽  
Linear Increase ◽  
Rate Of Change ◽  
Forage Yield ◽  
Annual Basis ◽  
Phenotypic Recurrent Selection ◽  
Winter Temperatures ◽  
Selection For ◽  
Efficiency Of Selection

Phenotypic recurrent selection on an annual basis was conducted with zigzag clover (Trifolium medium L.) to determine the efficiency of selection for improved seed and forage yield and the relationships among these characters. Seedlings were exposed to winter temperatures in a cold frame before they were transplanted in a field in the spring. The undesirable types were mowed prior to flowering and the selected plants were allowed to cross. Heads and seeds were harvested from each plant, and after seed threshing and counting, plants were further selected on the basis of numbers of seeds and heads. The effectiveness of four cycles of selection was evaluated over a 2-yr period in an experiment initiated with remnant seed and with management similar to that imposed during the selection process. Recurrent selection was effective in increasing vigor, seeds per head, heads per plant, and seeds per plant. A significant linear increase over cycles was found for each character. Vigor was not correlated with seeds per head, but was correlated with the other characters. The more vigorous plants also exhibited less stand reduction. Data from the two evaluation years were correlated suggesting that materials selected on an annual basis performed similarly to those grown in a 2-yr stand. Although recurrent selection was effective for improving all traits, the rate of change, particularly for seeds per head, was limited. Many more cycles of such selection would be required to change zigzag clover into a useful forage species. It was suggested that the phenotypic recurrent selection program should be continued on an annual basis, but modified if possible to select against the vernalization requirement for flowering which may be associated with poor seedling growth and low aftermath vigor.Key words: Trifolium medium, recurrent selection, vigor, persistance, heads and seeds per plant

scholarly journals Recurrent restricted phenotypic selection for forage yield in timothy and orchardgrass

1995 ◽  
Vol 75 (4) ◽  
pp. 871-875 ◽  
Author(s):  
D. Shateryan ◽  
B. E. Coulman ◽  
D. E. Mather
Keyword(s):  
Recurrent Selection ◽  
Dactylis Glomerata ◽  
Phenotypic Selection ◽  
Phleum Pratense ◽  
Forage Yield ◽  
Correlated Responses ◽  
Plant Persistence ◽  
Selection For ◽  
Dactylis Glomerata L ◽  
Phleum Pratense L

Three cycles of recurrent restricted phenotypic selection for forage yield were carried out in orchardgrass (Dactylis glomerata L. 'Avon' and 'Pennlate') and timothy (Phleum pratense L. 'Salvo' and 'Drummond'). The objectives of this study were to measure the effectiveness of this selection and to assess whether the selection produced any correlated responses on other characters. The three selected cycles and the original populations (cycle 0) were evaluated in both sward and space-planted experiments over a period of 4 yr. For the majority of the years of evaluation, there were no significant (P < 0.05) differences in forage yield among the different selection cycles. Under space-planted evaluation, cycle 3 of Drummond timothy was lower in both forage and seed yield than the other populations. In general, there was a trend to taller plants with greater circumferences in orchardgrass, and shorter, smaller plants in timothy over selection cycles. Selection had little effect on plant persistence and maturity. In conclusion, three cycles of recurrent restricted phenotypic selection were not effective in improving the forage yield of timothy or orchardgrass. Key words: Timothy, Phleum pratense, orchardgrass, Dactylis glomerata, recurrent selection

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