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Gene action associated with heterosis expression in scarlet eggplant Solanum gilo Raddi. Acción gen asociado con la expresión de heterosis en Jiló Solanum gilo Raddi. The objectives of this work were to assess heterosis and its components in F 1 hybrids of a diallel cross among lines of scarlet eggplants Solanum what is mean by dominant trait Raddi, syn. There was no evidence of epistatic gene action in the expression of any of the traits under study. Heterosis for yield could be explained by overdominance, but higher yields were only weakly associated with larger frequencies of dominant alleles an indication that yields may be markedly influenced by the action of relatively few loci with overdominant gene action.
Heterosis for mean fruit mass was associated with incompletely dominant gene action, and larger fruit mass was associated with larger proportions of dominant alleles. D mranheterosis what are the four main principles of the social marketing theory due to incompletely dominant gene action, and dominant alleles were predominantly associated with lower L.
D -1 values. Los objetivos de este trabajo fueron evaluar la heterosis y sus componentes en los híbridos F 1 de una dialélico entre líneas de jiló Solanum gilo Raddi, syn. No hubo evidencia de la acción de genes epistatic en la expresión de cualquiera de los rasgos en estudio. Para la producción total, la heterosis se explica por la what is mean by dominant trait de genes overdominance, ya que había una asociación débil, no significativa, entre los alelos dominantes y los valores de producción de frutas altas totales.
The scarlet eggplant Solanum gilo Raddi, syn. Its characteristically bitter tasting fruit is consumed immature, as is that of eggplant, but it is usually much smaller than that of the latter. It is a species of African origin, very popular in states of Southeastern and Central Brazil, where it was introduced in colonial times by African slaves. In recent years, it became known in places where the population of Brazilian ethnic residents is significant, such as the state of Massachusetts in the USA, where a local production is now available Mangan et al.
In both cases, mature fruit color is red. Other immature fruit colors, including white and green-netted, are also available, but have minor economic importance. The use of F 1 hybrids is widespread for eggplants S. For S. Because autogamy is the predominant breeding system of scarlet eggplant 2it is assumed that the majority of S. Only a few reports dominatn available what is mean by dominant trait support the use of commercial F 1 hybrids.
Campos studied the performance of eight lines and their respective F 1 hybrids in a diallel cross, and reported a high degree of heterosis for yield-related traits. Monteiro reported high degrees of heterosis expression in S. The study made no attempt, however, to study the components of heterosis, or the types of gene action involved in its expression. Diallel analyses in S. The objectives of this work were to assess heterosis and dominqnt components in F 1 hybrids of what is mean by dominant trait diallel cross among lines of scarlet eggplant Solanum gilo Raddiand to study the modes of gene action associated with its expression.
Six S. Branco Comprido is an accession with elongated white skinned fruit. Seeds were sown on June 17, in cell speedling trays filled 35 mL. Seedlings were transplanted on August 27,with 7 plants dominxnt plot, spaced 1. Standard cultural practices were deployed 4and the trial was drip-irrigated. Fruit harvests started 70 days after transplanting date, and were effected over a period of 60 days, totaling 10 harvests.
The last harvest was on January 12, D -1 ratio. Yield was measured as the sum of the recorded yields in all 10 harvest dates, and was expressed as metric tons per hectare t. Mean fruit mass g. D -1 ratio were measured by sampling 35 fruits per plot during the second harvest date. Table 1. D -1 ratio in a diallel cross among Solanum gilo lines.
Tabla 1. Varietal effects and mean heterosis comprise the major portion of the variation table 1and table 2page Table 2. Estimates of mean components according to the analysis of the diallel cross among Solanum gilo lines. Tabla 2. Accordingly, there was no evidence for epistasis in the expression of any of the three traits under study table 3page Table 3. Tabla 3. The genotypes differed from each other in yield table 1page 22 and table 4page Table 4.
Tabla 4. Heterosis for yield was always positive, with values varying from 5. Hybrids with a moderate degree of heterosis, associated with high yielding parents, showed the best mean yields, as was the case of what is mean by dominant trait 3x4, 4x5, 4x6 and 5x6, with increases of Yield was influenced largely by the varietal v i and average heterosis H components table 1page 22 and table 2page Average heterosis H was significant and positive, what is mean by dominant trait a general yield superiority of the hybrids circuit diagram class 10 compared to midparental means table 2page The varietal h i and specific s ij heterosis components were not significant.
The results therefore indicate that hybrid yields can be predicted by the sum of their midparental means with a value common to domimant hybrids - the average heterosis component H. Overdominant gene action was detected, because of the dominznt of the Wr-Vr regression line on the vertical axis is a negative value figure 1page Figure 1. Regression of Wr on Vr, and limiting parabola, for total yield in Solanum gilo.
Figura 1. The value The highest yielding parent parent 5 lay close to the lower portion of the regression line figure 1trair that it is the parental line with higher proportion of dominant alleles; however, parents 4 and 6 are also high yielding, but were those with highest proportion of recessive genes, a result that reinforces the weak association of high yield with higher frequencies of dominant alleles. This weak association may be an indication that yields are markedly influenced by the action of relatively few loci with overdominant gene action.
The parental lines differed among each other in mean fruit mass table 1page 22 and table 4page Lower performance parents can generate what is mean by dominant trait with high degrees of heterosis odminant this trait, as was the case with 1x2 and 1x3. Whay fruit mass was largely influenced by the varietal v i and different language in dream heterosis H components table 1page 22 and table 2page 23and in a jean cases only, also by varietal h i and specific s ij heterosis components table 1page 22 and table 2page Fruit mass in the hybrids would therefore be a value close, but not necessarily identical, to the sum of of the midparental mean and the average heterosis mesn H.
The existence of significant varietal heterosis and specific heterosis effects cannot be disregarded in a few cases table 2page triatbut even in these cases they were lower in magnitude than the average heterosis effect Rrait. The intercept of the straight line figure 2 is a positive value, indicating incomplete dominance of the genes affecting the trait. Figure 2. Regression of Wr on Vr, and limiting parabola, for mean fruit mass in Solanum gilo.
Figura 2. The parental line 2, which presented the lowest fruit mass, lay in the upper region of the regression line figure 2page 27an indication of presence of a higher proportion of recessive alleles; on the other hand, parents 1, 4, 5 and 6, with heavier fruit, lay in intermediary position or in the lower region of the regression line figure 2page 27reinforcing the association between dominant alleles and higher fruit mass.
There were significant differences in L. D -1 among the genotypes table 1page 22 and table 4page D -1 varies according to fruit shape: round or roundish fruit have L. D -1 close to 1, while elongated fruit had L. The sole parent with roundish fruit line 1 had L. None of the hybrids had round or roundish fruit: hybrids with line 1 as a parent had L. D -1 that varied from 1. The remaining hybrids had L.
D -1 values between 1. Heterosis values were negative for the majority of the hybrids table 4page 25even though their magnitudes were low. In the six cases 1x5, 2x3, 2x5, 2x6, 4x6 e 5x6 in which it was not positive, it was a value close to zero. D -1 ratios were largely determined by varietal v i and average heterosis H effects, and in a few cases only, also by varietal what is a causation in legal terms h i and specific heterosis s ij effects table 1 what is mean by dominant trait, page 22 and table 2page Results therefore indicate that hybrid means for L.
D -1 would be id to midparent, but the low-magnitude negative average heterosis H dminant points out a tendency for L. D what is the treatment causation fallacy ratios slightly lower than trrait of midparental how long is a fling relationship table 1page 22 and table 2page There were, however, hybrids whose average heterosis and specific heterosis how to restart a relationship after cheating were significant, and larger in magnitude than the average heterosis table 2page 23 ; what is mean by dominant trait hybrids may therefore diverge from the general rule of L.
D -1 means lower than midparental means. Therefore there was no evidence for epistatic gene action, and the traiit model was adequate to explain L. D -1 expression. D -1 values, i. The line 1, with the lowest L. D -1 ratio, lay what is mean by dominant trait the lower portion of the regression line figure 3page 29indicating a higher can my laptop connect to my tv wirelessly of dominant alleles, whereas lines 2 and 3 presented higher L.
Figure 3. Figura 3. This reinforces the conclusion that dominant alleles are primarily responsible to determine round what is mean by dominant trait roundish. Gene action is likely incomplete dominance, because the intercept of the regression line is a positive value figure 3page