scholarly journals Association of Pedicel Length and Diameter with Fruit Length and Diameter and Ease of Fruit Detachment in Pepper

1990 ◽  
Vol 115 (4) ◽  
pp. 677-681 ◽  
Author(s):  
Ridwan Setiamihardja ◽  
Dean E. Knavei
Keyword(s):  
Capsicum Annuum ◽  
Genetic Correlations ◽  
Fruit Characteristics ◽  
Gene Effects ◽  
Fruit Length ◽  
Detachment Force ◽  
Additive Gene Effects ◽  
Pedicel Length ◽  
Additive Gene ◽  
Fruit Diameter

Genetic correlations for pedicel length and diameter, fruit length and diameter, and fruit detachment force (FDF) were determined in three pepper (Capsicum annuum L.) families from crosses of `Serrano Chili' (low FDF) with three cultivars (`Anaheim Chili', `Keystone Resistant Giant', and `Red Cherry Small') characterized by high FDF and different fruit characteristics. Pedicel and fruit length means of F1 generations were nearly intermediate, while pedicel and fruit diameter means were shifted toward `Serrano Chili'. Progeny distributions in F2 generations were continuous and F2 means slightly less than the F1 means. Generation mean analyses indicated gene effects for pedicel and fruit length to be mostly additive. Gene effects for pedicel and fruit diameter were also mostly additive. Pedicel length was positively correlated genetically with fruit length, and pedicel diameter was positively correlated with fruit diameter. FDF means were positively correlated with pedicel and fruit length and diameter in most segregating generations. In BCP2 (`Serrano Chili' × `Red Cherry Small'), FDF was negatively correlated with pedicel and fruit length. Pendant fruit in BCP2 (`Serrano Chili' × `Red Cherry Small') were longer and narrower than upright fruit and FDF decreased with increased length of both pedicel and fruit.

scholarly journals Combining capacity and heterosis in eggplant hybrids under high temperatures

2019 ◽  
Vol 37 (3) ◽  
pp. 348-353
Author(s):  
Ricardo de N Valadares ◽  
Danieli A Nóbrega ◽  
Lilian B de Lima ◽  
Jordana Antônia dos S Silva ◽  
Ana Maria M dos Santos ◽  
...  
Keyword(s):  
High Temperatures ◽  
Combining Ability ◽  
Phenotypic Variability ◽  
Pollen Viability ◽  
Fixation Index ◽  
Gene Effects ◽  
F1 Hybrid ◽  
Fruit Length ◽  
Additive Gene Effects ◽  
Additive Gene

ABSTRACT The objective of this work was to estimate the combinatorial capacity and heterosis of eggplant hybrids under high temperature conditions. Seven genitors, twelve hybrid combinations, originated from a partial diallel, and the Ciça F1 hybrid, as control, were evaluated. The experiment was conducted under greenhouse conditions in randomized block design with four replications, from April to December 2017. The assessed traits related to high temperatures were pollen viability (PV) and fruit fixation index (FFI); the morphoagronomic traits were number of fruits per plant (NFP), fruit weight (FWe), production per plant (PP), fruit length (FL), fruit width (FWi), fruit length/width ratio (FLWR) and plant height (PH). The variance analysis showed greater participation of the additive gene effects in relation to the non-additive gene effects in most traits, except for PV. The genitors CNPH 141, CNPH 135, CNPH 109 and CNPH 51 stood out with favorable gene effects to obtain genotypes tolerant to high temperatures, since they present good general combining ability (GCA) for the traits FFI, NFP and PP. The 1x4 and 3x4 hybrids presented positive estimates for both GCA and specific combining ability (SCA), demonstrating a greater potential to be used in breeding to increase the FFI, NFP and PP, under high temperatures. The 1x4, 1x5 and 1x6 hybrids expressed positive heterosis for most analyzed traits. The 1x4 hybrid stood out for the highest averages for PV, FFI, NFP and PP. For FWe, FL, FWi and FLWR, both positive and negative heterosis were observed, as consequence of the phenotypic variability of the genitors for these traits and suggests the possibility of selection for different sizes and formats.

scholarly journals Heterosis and Combining Ability of Pumpkin (Cucurbita moschata Duch. Ex Poir.)

2017 ◽  
Vol 5 (2) ◽  
pp. 132 ◽  
Author(s):  
B. Ahmed ◽  
M. A. T. Masud ◽  
M. Zakaria ◽  
M. M. Hossain ◽  
M. A. K. Mian
Keyword(s):  
Combining Ability ◽  
Female Flower ◽  
Fruit Weight ◽  
Cucurbita Moschata ◽  
Gene Effects ◽  
Plant Yield ◽  
Fruit Length ◽  
Additive Gene ◽  
Half Diallel ◽  
Fruit Diameter

Combining ability and heterosis studies carried out using half diallel method with six parents for nine characters. The analysis revealed that none of the parents was found good general combiner for all the characters consistently, however the parents P2, P3, P4 and P5 were best general combiner’s for yield and flowering traits. The gca variance for node order to first female flower open, fruit length, fruit diameter, flesh thickness, average fruit weight, fruits per plant, yield per plant and TSS was higher than the sca variance. While the days to first female flower open had lower gca value than the sca variance indicating the predominance of non-additive gene effects. Five crosses P1×P4, P3×P6, P4×P2, P5×P3 and P5×P6 found promising and should be maintained for development of future hybrid varieties for their sca effect and desirable level of heterosis.

Quantitative genetic analysis of water deficit tolerance in coriander through physiological traits

2019 ◽  
Vol 17 (03) ◽  
pp. 255-264 ◽  
Author(s):  
Amir Gholizadeh ◽  
Hamid Dehghani ◽  
Mostafa Khodadadi
Keyword(s):  
Drought Stress ◽  
Essential Oil ◽  
Water Deficit ◽  
Combining Ability ◽  
Genetic Correlations ◽  
Physiological Traits ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Severe Water Deficit ◽  
Additive Gene

AbstractDrought stress restricts the production of agricultural crops through morphological, physiological and biochemical changes in plants. This study explored the genetic control of physiological traits related to drought in coriander. In a diallel analysis, all six parents, their 15 F1 hybrids and 15 F2 populations were subjected to different irrigation regimes including well-watered, mild and severe water deficit stress. Drought stress decreased the relative chlorophyll content (RCC), the relative water content (RWC), chlorophyll a (Chla), chlorophyll b (Chlb), total chlorophyll (TChl) content, carotenoids (Car) and essential oil yield (EOY) in F1 and F2 generations. General combining ability (GCA) and specific combining ability effects were highly significant for all traits in F1 and F2 generations. Additive gene action was predominant for Chla, Chlb, TChl and Car under well-watered condition while non-additive gene effects were more important under mild and severe water deficit stresses in F1 and F2 generations for the above traits. Additive gene effects were more important for RCC, RWC and electrolyte leakage (EL) traits in both F1 and F2 generations under mild and severe water deficit stresses. In conclusion, the high narrow-sense heritability and significant genetic correlations between EOY and RCC, RWC and EL suggest that these traits can be used as surrogates to identify superior genotypes for arid and semi-arid regions. Also, the parental lines, P4 and P6 had the best GCA for RCC, RWC, Chla, Chlb, TChl, Car, essential oil content and EOY.

scholarly journals Inheritance of Pedicel Characters and Their Association to Fruit Characters in Capsicum annuum L.

Zuriat ◽  
2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Ridwan Setiamihardja
Keyword(s):  
Capsicum Annuum ◽  
Correlation Coefficient ◽  
Fruit Size ◽  
Detachment Force ◽  
Capsicum Annuum L ◽  
Quantitative Characters ◽  
Pedicel Length ◽  
Highly Correlated ◽  
Fruit Characters ◽  
Fruit Diameter

Fruit detachment force (FDF) has shown highly correlated to the pedicel size of Capsicum annuum L. The inheritance of pedicel size (length and diameter) and their correlation to the fruit size (length and diameter) were evaluated from the cross 'Serrano' x 'KRG'. Pedicel length and diameter apparently were inherited as quantitative characters, mainly in additive manner, with very low heritability estimates, 4.4% and 8.5%, respectively. Correlation coefficient between fruit diameter and pedicel diameter was positive and significant at 1% level. There was an indication of linkage or pleiotropy between fruit diameter and pedicel diameter. 

A GENETIC STUDY OF EGG LAYING OF TRIBOLIUM IN OPTIMAL AND STRESS ENVIRONMENTS

1974 ◽  
Vol 16 (1) ◽  
pp. 49-60 ◽  
Author(s):  
Fernando Orozco ◽  
A. E. Bell
Keyword(s):  
Genetic Correlations ◽  
Egg Laying ◽  
Biological Model ◽  
Mild Stress ◽  
Severe Stress ◽  
Peak Period ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Additive Gene ◽  
Stress Environments

As a potential biological model of non-additive gene effects, the polygenic trait egg lay was studied in the unselected heterogenous Consejo Base Population of Tribolium castaneum in three environments: optimum (33 °C), mild stress (38 °C), and severe stress (28 °C). The measured variable was number of eggs laid by virgin females during the peak period of 7-11 days after adult emergence.Egg lay was highest in 33° (18.5 ± 0.1), followed in order by 38° (14.8 ± 0.1) and 28° (12.9 ± 0.1). Similar phenotypic variances in the optimum and mild stress environments were twice those observed in severe stress. Estimates for additive gene effects were larger than those for non-additive effects, but their relative amounts varied with environments. Heritability of egg lay was highest in the optimum environment (0.36 ± 0.03), followed by mild stress (0.30 ± 0.03) and severe stress (0.25 ± 0.03). The reverse was true for estimates of non-additive gene effects where 28° > 38° > 33° with values of 0.15, 0.09 and 0.04, respectively. All genetic correlations for egg lay in different environments were positive and large (0.69 ± 0.04 to 0.86 ± 0.02).The results suggest that egg lay in Tribolium, when observed in both optimum and stress environments, could provide an appropriate biological model for evaluating mating or selection schemes whose theoretical efficiencies vary with the relative importance of non-additive gene effects.

Estimating the heritability of butterfat production

1961 ◽  
Vol 57 (3) ◽  
pp. 289-294 ◽  
Author(s):  
S. R. Searle
Keyword(s):  
Genetic Variation ◽  
New Zealand ◽  
Dairy Cows ◽  
Total Variance ◽  
Additive Effects ◽  
Narrow Sense ◽  
Sampling Errors ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Additive Gene

Part of the variation among butterfat yields in dairy cows arises from genetic differences among the animals. The proportion which this bears to the total variance is known as heritability. In the ‘narrow’ sense it is defined (Lush, 1940), as the proportion of the total variance that is due to additive gene effects; the ‘broad’ sense definition includes genetic variation arising from non-additive gene effects as well as that due to additive effects. Since related animals have a proportion of their genes in common the covariance among their production records can be used for estimating genetic variation and hence heritability. This paper discusses three groups of related animals most frequently used for this purpose, twins, daughter-dam pairs and paternal half-sibs, and presents the results of analysing production records of artificially bred heifers in New Zealand, including evidence of the magnitude of the sampling errors of the heritability estimates.

Non-additive gene effects in populations under different methods of selection

1989 ◽  
Vol 78 (4) ◽  
pp. 567-580
Author(s):  
E. A. Carbonell ◽  
A. E. Bell ◽  
J. J. Frey
Keyword(s):  
Gene Effects ◽  
Additive Gene Effects ◽  
Additive Gene

Combining Ability Estimates in Heat Tolerant Tomato (Solanum lycopersicum L.) Genotypes

2010 ◽  
pp. 113-120
Author(s):  
S Ahmad ◽  
AKM Quamruzzaman ◽  
M Nazim Uddin
Keyword(s):  
Combining Ability ◽  
Agricultural Research ◽  
Relative Magnitude ◽  
Fruit Weight ◽  
Research Centre ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Component Traits ◽  
Additive Gene ◽  
Tomato Genotype

The experiment was conducted at the experimental farm of Olericulture Division, Horticulture Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur from May to August 2003. Combining ability effects were estimated for yield and component traits in a 8 x 8 diallel design excluding reciprocals in tomato. The variances for general combining ability (GCA) and specific combining ability (SCA) were highly significant indicating the presence of additive as well as non-additive gene effects in the traits studied. The relative magnitude of these variances indicated that additive gene effects were more prominent for all the characters under study. The tomato genotype P1 (TM051) proved to be the best general combiner for yield followed by P2 (TM053) and the combinations P1xP3, P1xP5 and P5xP7 were identified as the best specific combiner for earliness, yield per plant, number of fruits per plant and individual fruit weight.

scholarly journals Non-Additive Gene Effects of Six Broiler Traits as Studied from a Series of Diallel Matings ,

1959 ◽  
Vol 38 (4) ◽  
pp. 972-981 ◽  
Author(s):  
J. Kan ◽  
W.F. Krueger ◽  
J.H. Quisenberry
Keyword(s):  
Gene Effects ◽  
Additive Gene Effects ◽  
Additive Gene
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