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The joint analysis of the four environments was used to select the 20 HSP which were recombined in the summer of 93 to produce, simultaneously, new progenies to start the fifth cycle of SAWHSP in the CMS population. Table IV shows the selected progenies. There was a tendency for the BLP methodology to select cuantutativa greater number of related progenies pedigree than the SAWHSP method, which implies greater care with the effective size of the population. One should continue with the same structure of the modified Irish method, shown in Figure 1but with a balanced mixture of seeds from ears selected within the female row used for recombination, to sow the female rows.
On the other hand, it can be seen that the BLP was influenced by al phenotypic values, because it distributes this influence equally to all the progenies of the same family. The realized gain estimated by Arriel et al. Thus, the gain of selection GS obtained with the BLP is the selection differential SD among the means of the genetic values of the selected progenies in relation to all the assessed ones.
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The pedigree system, although unnecessary for the routine use of the SAWHSP methodology, allowed the prediction of an increase in the inbreeding of the population in the long term SAWHSP selection when recombination is simultaneous to creation of new progenies.
This implies that greater care with the effective size of the population must be taken with this method. There was a tendency in the BLP methodology to select a greater number of related progenies because of the previous generation pedigree than the other method.
Please refer to our privacy policy for more information on privacy at Loot. To access your account information you need to be authenticated, which means that you need to enter your password to confirm that you are indeed the person that the cookie claims you to be. First, the relationship of half-grandparents between the new HSP new cycle and the old HSP previous cycle is irrelevant.
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. The authors would like to thank the valuable collaboration of Drs.
Services on Demand Journal. Figure 1 – Field scheme for half-sib progeny HSP recombination with simultaneous obtention of new progenies. For example, at loot. The pedigree system, although unnecessary for HSP selection, allowed the prediction of an increase in the rate of inbreeding in the long term with the originally proposed scheme, when recombination is simultaneously carried out with the creation of new progenies.
Selection index and expected genetic advance. However, the existing relationship among different HSP derived from the same half-grandmother was not sufficient to differentiate the gains from the two methodologies. Table I shows the individual and joint variance analyses genstica the four environments, where the importance of the genotype x environment interaction is apparent. Duantitativa these results, it was shown that the original SAWHSP, quoted by Paterniani and Miranda Filhois an efficient method, even when the relationship of the cjantitativa progenies is not considered.
This genealogical structure is disregarded in the original methodology quoted by Paterniani and Miranda Filhobased on two assumptions. All mainstream modern browsers have cookies enabled by default, so if you’ve been directed to this page it probably means you’re uisng a weird and wonderful browser of your own choosing, or have disabled cookies yourself. The SAWHSP methodology was efficient in isolating the additive genetic variance component from the phenotypic component.
No supplementary irrigation was used. This difference was attributed to the genotype x environmental interaction, whose component was large in the three cycles, being larger than the estimate of genetic variance among the HSP in this cycle Table I.
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To estimate the genetic value cuantitativaa inverting the variance and covariance matrices of the observed data, a time-consuming computer operation, since this matrix is frequently non-diagonal and very large, Henderson proposed an alternative computer method using mixed model equations for obtaining the BLUP.
Sufficient genetic variability was observed in the fourth selection cycle of the CMS population allowing the continuation of the breeding program, with an expected gain of 9. This also occurred in the previous selection cycles Aguiar, ; Pacheco, ; Arriel, intrkduccion Let’s connect Contact Details Facebook Twitter.
The BLUP determination for selection among half-sib progenies adapted to mixed model methodologies, revised by Martins et al. Thus, the diagonal of the kinship sub-matrices is 0. However, the indication of a reduction in the effective size of the population caused by an imbalance in the contribution of the selected progenies, as shown by the pedigree structure, draws attention to the problem of an increase in the level of inbreeding.
Introduccion a la Genetica Cuantitativa. In other words, the BLP conferred greater importance to the mean of the related progenies with the same half-grandmother than to the means of the isolated HSP, a process that results in genetics screening out of the high mean progenies descending from low mean families, which would be selected based on their phenotype.
Success in genetic breeding is mainly dependent on the selection method used. This lack of agreement is partially due to the fact that the estimates of the expected gains are based on phenotypic values, which suffer from environmental influences and from genotype x environment interaction. For the male rows a balanced mixture of seeds from the ears of all new HSP should be used.
We never store sensitive information about our customers in cookies. With large cuabtitativa 2 the phenotypic value is a good predictor of the genetic value. Besides breeding strategies, there are also biometric methodologies with a strong theoretical base which could be used by plant breeders to efficiently identify superior genotypes and obtain greater gains.
Among known methods, selection among and within half-sib progenies SAWHSP is one of the most used for maize because of its proven efficiency along with its easy handling and simplicity in estimating genetic parameters Paterniani and Miranda Filho, A activation email has been sent to you. Among these are BLUP best linear unbiased predictorwhich classifies cuantitatiiva submitted to selection using a function of the observed data and a matrix of genetic and residual variances and covariances of previously known traits Henderson, The environment variation coefficients are within the variation limits found by Ramalho for this type of progeny.
Please click the link in that email to activate your subscription. In the majority of cases the expected gains are overestimated, which was also shown for this population by Arriel et al.
According to Hendersonthe BLUP of g is defined as the regression coefficient of the genetic values g in function of the observations y corrected for the fixed effects Xb. More details of this method are given by Martins et al. Email address subscribed successfully. Galconer example, in the experiment Table II the old progeny number 34 contributed four new progenies, when it was expected to contribute only one.
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When the expiry date is reached your computer deletes the cookie. Similarly, when the kinship was considered in the joint analysis, the genetic gains were close 9.
The coefficients of coincidence percentage of common HSP selected by each methodology and the expected gains from selection were estimated. There are several examples in the literature which show gains from truncated selection for yield in various maize populations.
