Divergent Selection for Stalk Quality and Grain Yield in an Adapted ✕ Exotic Maize Population Cross 1

Crop Science ◽  
1987 ◽  
Vol 27 (3) ◽  
pp. 487-494 ◽  
Author(s):  
Bruno Albrecht ◽  
J. W. Dudley
Keyword(s):  
Grain Yield ◽  
Divergent Selection ◽  
Maize Population ◽  
Selection For

scholarly journals Genetic correlation between traits in the ESALQ-PB1 maize population divergently selected for tassel size and ear height

2001 ◽  
Vol 58 (1) ◽  
pp. 119-123 ◽  
Author(s):  
Austeclínio Lopes Farias Neto ◽  
José Branco de Miranda Filho
Keyword(s):  
Genetic Correlation ◽  
Correlation Coefficients ◽  
Divergent Selection ◽  
Phenotypic Correlation ◽  
Base Population ◽  
Branch Number ◽  
Maize Population ◽  
Tassel Branch Number ◽  
Ear Height ◽  
Selection For

Full-sib and selfed (S1) progenies were obtained from sub-populations of ESALQ-PB1, divergently selected for tassel size (T+ and T-) and ear height (E+ and E-), and used for estimating genetic and phenotypic correlation coefficients between traits. The analyzed traits were: EW- total ear weight (g/plant), PH- plant height (cm), EH- ear height (cm), TB- tassel branch number and TL- tassel length. The highest genetic (rG) and phenotypic (rF) correlation was observed for the combination PH x EH, as expected, with average of 0.800 and 0.778, respectively over sub-populations and locations. It is apparent that divergent selection for tassel size did not affect greatly the correlation between PH and EH in the full sib progenies, but in the inbred progenies the correlation was smaller in the sub-population selected for larger tassels. Genetic correlation between PH and EH with tassel traits was always positive but ranged from 0.020 to 0.668 in Piracicaba and from 0.06 to 0.309 in Rio Verde. Genetic correlation between PH and EH with yield (EW) also was positive in the range of 0.087 to 0.503. EH showed higher correlation with EW in relation to PH x EW and differences were larger in the sub-populations divergently selected for ear height. Correlation between tassel traits with other traits was positive in most of instances and a lack of consistency was observed among sub-populations. Generally the coefficients of genetic and phenotypic correlation differed substantially from the estimates in the base population ESALQ-PB1 before divergent selection for tassel size and ear placement. Divergent selection affected the correlation between traits under unpredicted and varying magnitudes.

Genetic loci responding to two cycles of divergent selection for grain yield under drought stress in a rice breeding population

Euphytica ◽  
2009 ◽  
Vol 167 (2) ◽  
pp. 261-269 ◽  
Author(s):  
R. Venuprasad ◽  
M. E. Bool ◽  
C. O. Dalid ◽  
J. Bernier ◽  
A. Kumar ◽  
...  
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Breeding Population ◽  
Divergent Selection ◽  
Rice Breeding ◽  
Genetic Loci ◽  
Selection For

GENETIC RELATIONSHIPS BETWEEN GRAIN YIELD AND YIELD COMPONENTS IN A SYNTHETIC MAIZE POPULATION AND THEIR IMPLICATIONS IN SELECTION

2001 ◽  
Vol 49 (4) ◽  
pp. 337-342 ◽  
Author(s):  
N. VASIC ◽  
M. IVANOVIC ◽  
L. A. PETERNELLI ◽  
D. JOCKOVIC ◽  
M. STOJAKOVIC ◽  
...  
Keyword(s):  
Grain Yield ◽  
Genetic Correlation ◽  
Yield Components ◽  
Genetic Relationships ◽  
Maize Population ◽  
Selection Indices ◽  
Ear Height ◽  
Selection For ◽  
Efficiency Of Selection ◽  
Simple Selection

The synthetic maize population 316PO2 was subjected to genetic correlation analyses between grain yield, yield components and morphological traits. The purpose was to enable estimates to be made of the advantage of using selection indices compared with selection based on grain yield only, and if that advantage was present, to choose enough simple selection indices for practical use. Selection indices were constructed out of four traits highly significantly correlated with grain yield, in addition to yield itself. Grain yield exhibited a highly significant additive genetic correlation with ear diameter (ra=0.588**), kernels row-1 (ra=0.643**), ears plant-1 (ra=0.871**) and ear height (ra=0.427**). The most efficient index was Index No. 14 (R.E.I12345= 108.83%), which included all four traits and grain yield. Index No. 3, one of the simplest forms of index, including only ears plant-1 and grain yield, showed slightly less relative efficiency (R.E.I35=107.24%) than Index No. 14. Using this simple form of index with two characters (Index No. 3) could improve the efficiency of selection for grain yield. The estimated advantage from its use is 179.6 kg/selection cycle for grain yield over selection based only on grain yield.

Mass Selection for Improvement of Grain Yield and Protein in a Maize Population

Crop Science ◽  
1999 ◽  
Vol 39 (5) ◽  
pp. 1302-1305 ◽  
Author(s):  
Eleftherios A. Bletsos ◽  
Christos K. Goulas
Keyword(s):  
Grain Yield ◽  
Mass Selection ◽  
Maize Population ◽  
Selection For

Recurrent Selection for Grain Yield in a Maize Population 1

Crop Science ◽  
1983 ◽  
Vol 23 (3) ◽  
pp. 536-540 ◽  
Author(s):  
N. N. Mulamba ◽  
A. R. Hallauer ◽  
O. S. Smith
Keyword(s):  
Grain Yield ◽  
Recurrent Selection ◽  
Maize Population ◽  
Selection For

The effect of honeycomb selection for grain yield on a maize population

1996 ◽  
Vol 127 (2) ◽  
pp. 143-149 ◽  
Author(s):  
A. Sotiriou ◽  
M. Koutsika-Sotiriou ◽  
E. Gouli-Vavdinoudi
Keyword(s):  
Genetic Variation ◽  
Grain Yield ◽  
Source Population ◽  
Maize Population ◽  
Single Cross ◽  
Honeycomb Selection ◽  
Sib Families ◽  
Selection For ◽  
Deleterious Genes ◽  
Single Cross Hybrids

SUMMARYStarting with the F2 generation of a single-cross hybrid, a maize population was improved from cycle 0 (= F2) to cycle 4 by mass honeycomb selection and from cycle 5 to cycle 8 by pedigree honeycomb selection. Seven half-sib families were derived from cycle 8. The grain yield of these, their corresponding S1 lines, testcrosses with B73 and diallel crosses were studied. The results showed (i) that the seven half-sib families contained half the percentage of the load of deleterious genes present in the F2 generation, (ii) that four of them outyielded their corresponding single-cross hybrids, (iii) that they could constitute an open-pollinated variety, which could be used as a source population and (iv) that they revealed different patterns for general and specific combining ability. Honeycomb selection for grain yield was successful in favouring the existing additive genetic variation in the derived families.

Changes in genetic variances and heritabilities in an early white maize population following S1 selection for grain yield, Striga resistance and drought tolerance

2016 ◽  
Vol 155 (4) ◽  
pp. 629-642 ◽  
Author(s):  
B. BADU-APRAKU ◽  
M. OYEKUNLE ◽  
A. O. TALABI ◽  
B. ANNOR ◽  
I. C. AKAOGU
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Recurrent Selection ◽  
Central Africa ◽  
Maize Production ◽  
Genetic Variances ◽  
Maize Population ◽  
Ear Height ◽  
Selection For ◽  
Advanced Cycles

SUMMARYDrought is a major constraint to maize production in West and Central Africa (WCA). Assessment of genetic gain from S1 recurrent selection under drought is crucial for the development of drought tolerance breeding strategies. In an early white population, 60 S1 families each derived from the base population and three cycles of selection were evaluated under drought and well-watered conditions at two locations in Nigeria for 2 years to determine genetic variability, gains from selection and predict response to selection for grain yield and other traits. Genetic variances generally decreased for yield and other traits in advanced cycles under drought and well-watered conditions except yield and ear height under well-watered conditions. Similarly, heritabilities for yield and other traits decreased in advanced cycles under drought but increased in advanced cycles under well-watered conditions. Realized gain for yield was 0·291 t/ha, corresponding to 30·5% per cycle under drought and 0·352 kg/ha with a corresponding gain of 16·7% per cycle under well-watered conditions. Predicted gain based on C3 was 0·282 and 0·583 t/ha under drought and well-watered conditions. Low genetic variances, heritabilities and predicted gain for yield and other traits suggested a need to introgress drought tolerance genes into the population.

Response to two cycles of divergent selection for grain yield under drought stress in four rice breeding populations

2008 ◽  
Vol 107 (3) ◽  
pp. 232-244 ◽  
Author(s):  
R. Venuprasad ◽  
M.T. Sta Cruz ◽  
M. Amante ◽  
R. Magbanua ◽  
A. Kumar ◽  
...  
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Divergent Selection ◽  
Rice Breeding ◽  
Breeding Populations ◽  
Selection For
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