scholarly journals Inheritance of a Novel Heterozygous Peanut Mutant, 5-Small Leaflet

2020 ◽  
Vol 47 (1) ◽  
pp. 33-37
Author(s):  
W. D. Branch ◽  
S. P. Tallury ◽  
J. P. Clevenger ◽  
B. M. Schwartz ◽  
W. W. Hanna
Keyword(s):  
Arachis Hypogaea ◽  
Pollen Parent ◽  
Normal Leaf ◽  
Mutant Plant ◽  
Arachis Hypogaea L ◽  
True Breeding ◽  
Selection For

ABSTRACT An unusual 5-Small Leaflet mutant plant was found within the ‘Georgia Green' runner-type peanut (Arachis hypogaea L.) cultivar. Subsequent selfing has not established a true-breeding 5-Small Leaflet genotype. It continues to segregate normal and 5-Small Leaflet plants but with a reduced number of normal leaf plants upon selection for 5-Small Leaflet phenotypes after several self-generations. F1, F2, F3, and F4 data suggests that the 5-Small Leaflet trait is dominant or possibly pseudo-dominant. Likewise, the 5-Small Leaflet mutant can only be used as a pollen parent in crosses, and it has approximately a 1:1 ratio of elongated to normal stigmas, respectively, on individual plants. This is an example of a novel heterozygous peanut mutant plant found within the cultivated allotetraploid peanut.

scholarly journals Revolute-Leaf, a New Completely Dominant Mutant in Peanut

2018 ◽  
Vol 45 (2) ◽  
pp. 67-69 ◽  
Author(s):  
W. D. Branch
Keyword(s):  
Arachis Hypogaea ◽  
Dominant Gene ◽  
Breeding Line ◽  
Normal Leaf ◽  
Cross Combination ◽  
Mutant Plant ◽  
Arachis Hypogaea L ◽  
Dominant Mutant ◽  
Leaf Mutant ◽  
Light Green

ABSTRACT A Revolute-Leaf mutant plant was discovered in an advanced Georgia peanut (Arachis hypogaea L.) breeding line, GA 112702. The mutant had leaf margins that curve downward on each of the four small light-green leaflets. Two cross combinations were used to determine the inheritance of this new mutant. F1, F2, and F3 segregation data strongly supported a single completely dominant gene, designated Rev, controlling the inheritance of the Revolute-Leaf mutant. The F2:3 homozygous revolute-leaf individual plants had shorter mainstem heights, narrower leaflet length and width, narrower canopy width, reduced pod and seed weights, but similar SMK percentages compared to the F2:3 homozygous normal leaf plants resulting from the same closely related cross combination (GA 112702 x Revoluted-Leaf mutant).

scholarly journals Inheritance of Spear-Shaped Leaf in Peanut

2017 ◽  
Vol 44 (2) ◽  
pp. 74-76 ◽  
Author(s):  
William D. Branch
Keyword(s):  
Arachis Hypogaea ◽  
Dominant Gene ◽  
Normal Leaf ◽  
Cross Combination ◽  
Mutant Plant ◽  
Leaf Trait ◽  
Segregation Data ◽  
Arachis Hypogaea L ◽  
Leaf Mutant

ABSTRACT Recently, a single Spear-shaped Leaf mutant plant was discovered in the ‘Georgia-06G' peanut (Arachis hypogaea L. ssp. hypogaea var. hypogaea) cultivar. The mutant had narrow leaflets with each leaflet tapering to a point which gives the appearance of a spearhead shape. Three cross combinations were used to determine the inheritance of this new mutant. F1, F2, and F3 segregation data strongly supported a single incompletely dominant gene, designated SpL, controlling the inheritance of the Spear-shaped Leaf trait. The F2:3 homozygous spear-shaped individual plants had taller mainstem heights, narrower leaflet width, reduced pod weight, and lower SMK percentages compared to the F2:3 homozygous normal leaf plants resulting from the same closely related cross combination (Georgia-06G x Spear-shaped Leaf mutant).

scholarly journals Genetic Studies Involving Wine Testa Color in Peanut1

1997 ◽  
Vol 24 (1) ◽  
pp. 60-62 ◽  
Author(s):  
W. D. Branch
Keyword(s):  
Arachis Hypogaea ◽  
Genetic Study ◽  
Genetic Studies ◽  
Arachis Hypogaea L ◽  
True Breeding ◽  
Cultivated Peanut ◽  
Testa Color ◽  
New Cultivars

Abstract A better understanding of peanut (Arachis hypogaea L.) testa color genetics would be helpful to breeders in developing new cultivars to meet U.S. market acceptability. Wine is one of the least understood of all basic testa colors in peanut. The objective of this genetic study was to gain further knowledge on the inheritance of wine testa color and possible allelic interactions. Crosses were made using two true-breeding wine testa color genotypes (Wine-Frr and PI 264549) as females with the tan testa and recessive red testa male parents Krinkle-Leaf and Makulu Red, respectively. F1, F2, and F3 data suggest no difference between the two wine testa color genotypes. Inheritance of wine testa color was found to be recessive with a one gene difference between wine and the tan testa color of Krinkle-Leaf, and with two gene differences between wine and the recessive red testa color of Makulu Red. Inheritance of wine seems to closely parallel that for recessive red testa color in the cultivated peanut.

scholarly journals Selection Indices for Simultaneous Selection for Pod Yield and Leafspot Resistance in Peanut (Arachis hypogaea L.)1

1987 ◽  
Vol 14 (1) ◽  
pp. 51-54 ◽  
Author(s):  
R. N. Iroume ◽  
D. A. Knauft
Keyword(s):  
Arachis Hypogaea ◽  
Breeding Value ◽  
Direct Selection ◽  
Index Selection ◽  
Cercospora Arachidicola ◽  
Pod Yield ◽  
Arachis Hypogaea L ◽  
Yield Gain ◽  
Selection For ◽  
Disease Pressure

Abstract The objective of this study was to investigate the possibility of index selection for pod yield and leafspot resistance, causal organisms Cercospora arachidicola Hori and Cercosporidium personatum (Berk. and Curt.) Deighton, in peanut (Arachis hypogaea L.). Eleven crosses were evaluated in the S1 and S2 generations under natural disease pressure for pod yield and disease reaction. Leafspot severity was measured by leaf necrotic area and defoliation. Variances for each trait and covariances between traits were estimated by progeny analysis. Economic weights assigned to the different characters were derived as the ratio of the pod yield for a genotype to the theoretical pod yield gain from leafspot resistance. Indices were constructed and their efficiency both as predictor of the breeding value and relative to individual selection for either trait was evaluated. Index selection for increased pod yield and reduced leafspot susceptibility was between 87% and 100% as efficient as direct selection for either trait. Combining several leafspot severity readings with pod yield did not improve the efficiency of the index. Fourteen to 17% of the breeding value of the population was accounted for by the traits combined in various indices. This indicated that there is potential for improvement of these indices.

Inheritance of White-Spot Testa Color Trait in Peanut1

1998 ◽  
Vol 25 (1) ◽  
pp. 44-45 ◽  
Author(s):  
W. D. Branch
Keyword(s):  
Arachis Hypogaea ◽  
White Spot ◽  
Arachis Hypogaea L ◽  
True Breeding ◽  
Cultivated Peanut ◽  
Recessive Genes ◽  
Testa Color

Abstract The white-spot testa color trait has occasionally been found among segregating cross populations in the cultivated peanut (Arachis hypogaea L.). Crosses involving one such true-breeding white-spot selection were made both between and within subspecies of the cultigen to determine the inheritance of this unusual trait. The F1, F2, and F3 data indicated that two duplicate recessive genes, designated wsp1 and wsp2, control the white-spot trait in peanut.

scholarly journals Heritabilities and Correlations for Pod Yield and Leafspot Resistance in Peanut (Arachis hypogaea L.): Implications for Early Generation Selection1

1987 ◽  
Vol 14 (1) ◽  
pp. 46-50 ◽  
Author(s):  
R. N. Iroume ◽  
D. A. Knauft
Keyword(s):  
Arachis Hypogaea ◽  
Genetic Correlations ◽  
Plant Performance ◽  
Direct Selection ◽  
Individual Plant ◽  
Cercospora Arachidicola ◽  
Early Generation ◽  
Pod Yield ◽  
Arachis Hypogaea L ◽  
Selection For

Abstract The purpose of this study was to investigate early generation selection methods for the identification of peanut (Arachis hypogaea L.) crosses with combined high yield and disease resistance. Eleven crosses were chosen in the S1 on the basis of yield and disease reaction. The S2 was evaluated under natural disease infection for pod yield and leafspot resistance, causal organisms Cercospora arachidicola Hori and Cercosporidium personatum (Berk. and Curt.) Deighton. Resistance was measured by leaf necrotic area and defoliation. Narrow sense heritabilities for all the traits were estimated by sib analysis and regression of S2 plant performance on S1 plant performance. Genetic correlations among traits and the relative efficiency of indirect selection for all the traits were also computed. The results suggest that selection among crosses for all the traits would be advantageous in the S1 (h2f = 67 to 79%) as compared to individual plant selection (h2 = 16 to 26%) or within family selection (h2w = 3 to 5%). Selection of genotypes within crosses would be the poorest strategy in early generations. Negative genetic correlations were noted between yield and leafspot severity. The expected progress in increasing resistance of peanut genotypes through selection for yield (30 to 40% of the response from direct selection for resistance) indicated that selection for yield under disease pressure may be advantageous for developing high yielding, leafspot tolerant genotypes.

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