scholarly journals Selección de progenitores de maíz para la obtención de semilla híbrida por pequeños agricultores.

2006 ◽  
Vol 11 (2) ◽  
pp. 85 ◽  
Author(s):  
Roberto Valdivia ◽  
Víctor A. Vidal ◽  
Mauro Sierra
Keyword(s):  
Seed Production ◽  
Recurrent Selection ◽  
Winter Season ◽  
Hybrid Seed ◽  
Reciprocal Recurrent Selection ◽  
The Cross ◽  
The Cost ◽  
Selection Of ◽  
Better Than ◽  
Local Farmers

The seed of actual high yielding hybrids are very expensive and local farmers tend to use advanced generations to reduce costs. Abetter choice is to produce seed of maize intervarietal hybrids. The objective of this research was to describe the experience of a group of maize producers in the seed production, utilization and improvement of their parents of intervarietal hybrids. The study was conducted in Nayarit State, Mexico. In 1996, a group farmers, supported by a technical researcher, evaluated two maize intervarietal crosses. The cross B840xC343 yielded better than nine commercial hybrids. This motived the farmers to produce 20 tons of seed in eight intervarietal crosses during the winter season of 1997/98. The cost of the seed production was 50% less than the cost of commercial hybrid seed. The eight intervarietal crosses were commercial planted in about 400 hectars and were evaluated in four experiments by the farmers. The results showed that two crosses, P3028xA7573 and C385xD880, had the best results. The first cross had a heterosis of 4.1% over the high yielding parent and the second a heterosis of 30% over a parent. Since 1999, the parents of the best intervarietal cross is being improved by reciprocal recurrent selection of half siblings, two years per cycle.

scholarly journals Selection gains for the palm oil production from progenies of American oil palm with oil palm

2021 ◽  
Vol 56 ◽  
Author(s):  
Rui Alberto Gomes Junior ◽  
Alessandra Ferraiolo de Freitas ◽  
Raimundo Nonato Vieira da Cunha ◽  
Antônio José de Abreu Pina ◽  
Higo Otávio Brochado Campos ◽  
...  
Keyword(s):  
Palm Oil ◽  
Oil Palm ◽  
Genetic Parameters ◽  
Recurrent Selection ◽  
Oil Production ◽  
Reciprocal Recurrent Selection ◽  
Fresh Fruit Bunches ◽  
Favorable Conditions ◽  
Selection Of

Abstract The objective of this work was to estimate the genetic parameters, correlations, and selection gains for the oil production of interspecific hybrids progenies between American oil palm, of ‘Manicoré’ origin, and oil palm, of ‘La Mé’ origin. Thirty-nine progenies were evaluated from the sixth to the ninth year after planting, for the productivity of fresh fruit bunches (PROD_FFB), oil content in the bunch (OCB), and palm oil productivity (PROD_OP). The genetic parameters and gains from direct (GDS) and indirect (GIS) selection were estimated for PROD_OP. High values of heritability for the CVg/CVe ratio indicated favorable conditions for the selection. With the selection of 20% of the progenies (selection in both sexes), the following estimates were obtained: 11.15% GDS for PROD_OP, 9.1% GIS for OCB, and 8.1% GIS for PROD_FFB. The PROD_OP of the progenies was of 6,175, 6,057, and 5,995 kg ha-1 per year with GDS and GIS for OCB and PROD_FFB, respectively. The restricted selection of the LM2T male genitor offspring resulted in 5.1% estimated GSD and in a mean of 5,800 kg ha-1 per year for PROD_OP. Selection gains for PROD_OP can be achieved immediately through the selection restricted to oil palm male genitors, and, in the medium and long term, through the interspecific reciprocal recurrent selection between American oil palm and oil palm populations.

scholarly journals Genetic progress in maize from advanced cycles of reciprocal recurrent selection through REML/BLUP

2020 ◽  
pp. 1295-1301
Author(s):  
José Arantes Ferreira Júnior ◽  
Gabriel Moreno Bernardo Gonçalves ◽  
Jocarla Ambrosim Crevelari ◽  
Julio Cesar Fiorio Vettorazzi ◽  
Vivane Mirian Lanhellas Gonçalves ◽  
...  
Keyword(s):  
Grain Yield ◽  
Mixed Models ◽  
Variance Components ◽  
Genetic Parameters ◽  
Recurrent Selection ◽  
Yield Potential ◽  
Reciprocal Recurrent Selection ◽  
Genetic Progress ◽  
Advanced Cycles ◽  
Selection Of

Breeding methods such as reciprocal recurrent selection (RRS) is very important alternative to breeders. This strategy, besides allowing continuous genetic progress, helps maintaining the genetic variability of populations. The aim of the present study was to estimate genetic parameters, as well as to predict selection gains in advanced cycles of reciprocal recurrent selection of maize progenies through mixed models. Two selection cycles were considered. We evaluated 196 and 169 progenies in the 15 and 16 cycles, respectively. The yield potential of the progenies was evaluated from the following characteristics: grain yield, number of ears, weight of ears and weight of 100 seeds. The estimate of variance components and the prediction of genetic values were based on the REML/BLUP method. Overall, the genetic parameters were increased in the 16th cycle estimates compared to the previous cycle. It is worth highlighting that heritability coefficient for the grain yield was (0.81) in the 16th cycle, since it resulted in 21% of selection gain. Results showed that, even after sixteen recurrent selection cycles, the populations under selection have high potential for satisfactory genetic gains.

scholarly journals SCS313 Serrano, a big trefoil selected for flowering ability and seed production

2021 ◽  
Author(s):  
Dediel Junior Amaral Rocha ◽  
Ulisses Arruda Cordova ◽  
Jefferson Flaresso ◽  
Joseli Stradiotto ◽  
Murilo Dalla-Costa
Keyword(s):  
Seed Production ◽  
Recurrent Selection ◽  
Morphological Difference ◽  
Breeding Population ◽  
Low Latitude ◽  
Beginning Of Flowering ◽  
Flowering Ability ◽  
Mean Time ◽  
Livestock Systems ◽  
Selection Of

SCS313 Serrano is a tetraploid cultivar of Lotus uliginosus developed by the Research and Rural Extension Company of Santa Catarina, Brazil, to improve flowering ability and seed production in low-latitude regions. SCS313 Serrano was developed from the selection of individual plants of the cultivar Grasslands Maku. Seeds from the initial breeding population was bulked and used to establish a field trial with spaced plants. The plants were selected and classified as late or early, regarding the beginning of flowering, through visual evaluations based on the time for the beginning of flowering. Selected plants were transplanted to crossing blocks and seed harvested on individual plants; a progeny test was conducted, with four replications, through the establishment of approximately 100 genotypes in a field. This process was repeated for three consecutive cycles of recurrent selection. Considering the mean time for the beginning of flowering and vigor performance, the best five genotypes were selected as parental lines for the synthetic cultivar SCS313 Serrano. A morphological difference between SCS313 Serrano and Grasslands Maku is that SCS313 Serrano has absence of hairs in stems whereas Grasslands Maku has a medium stem hair density. In addition, SCS313 Serrano exhibits profuse flowering ability while Grasslands Maku exhibits very sparse seedhead formation. SCS313 Serrano exhibited good persistence under wet conditions and similar forage yields compared to other lotus commercial cultivars. Thus, SCS313 Serrano is recommended to be used as pasture in mixtures with grass in livestock systems, mainly on wet soils.

scholarly journals EVALUATION OF THE MATERNAL FORMS OF CUCUMBER HYBRIDS FOR OPEN GROUND IN TERMS OF THE DEGREE OF EXPRESSION OF THE FEMALE SEX

2018 ◽  
pp. 40-42
Author(s):  
I. B. Korottseva ◽  
S. N. Belov
Keyword(s):  
Seed Production ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Labor Costs ◽  
Single Male ◽  
Female Type ◽  
Female Sex ◽  
Open Ground ◽  
Male Flowers ◽  
The Cost

Growing heterotic hybrids of cucumber on large areas is possible only if the production of their seeds does not require large additional labor costs in comparison with conventional varieties. Cleaning of maternal forms by flowering type – removal of plants of intermediate type of flowering and single male flowers on plants of predominantly female type requires considerable labor costs. Significantly simplifies and reduces the cost of hybrid seed production using maternal forms of female type that do not have male flowers. It is very important to create maternal forms with a consistently high female expression that do not respond to changing environmental conditions. This will allow hybrid seed production of cucumber not only in protected, but also in the open ground, which will significantly reduce the cost of production of seeds. The objective was to assess the maternal forms of the cucumber hybrids F1 Krepish (L-100), F1 Brunet (L-105), F1 Frant (L-290), F1 Krasotka (L-25) according to the female expression in the conditions of spring film greenhouses and open ground near Moscow. The open ground served as a provocative background for identifying the most stable in terms of the severity of the female sex lines. It was determined that the bee-polluted hybrids of the cucumber F1 Krepish and F1 Brunet are most suitable for conducting hybrid seed production in the open field, since their maternal forms need to be cleaned according to the blooming type less than others.

scholarly journals Male Fertility Genes in Bread Wheat (Triticum aestivum L.) and Their Utilization for Hybrid Seed Production

2021 ◽  
Vol 22 (15) ◽  
pp. 8157
Author(s):  
Manjit Singh ◽  
Marc C. Albertsen ◽  
A. Mark Cigan
Keyword(s):  
Male Sterility ◽  
Seed Production ◽  
Male Fertility ◽  
Production Systems ◽  
Triticum Aestivum L ◽  
Hybrid Seed ◽  
Addition Line ◽  
Hybrid Seed Production ◽  
Wheat Varieties ◽  
The Cost

Hybrid varieties can provide the boost needed to increase stagnant wheat yields through heterosis. The lack of an efficient hybridization system, which can lower the cost of goods of hybrid seed production, has been a major impediment to commercialization of hybrid wheat varieties. In this review, we discuss the progress made in characterization of nuclear genetic male sterility (NGMS) in wheat and its advantages over two widely referenced hybridization systems, i.e., chemical hybridizing agents (CHAs) and cytoplasmic male sterility (CMS). We have characterized four wheat genes, i.e., Ms1, Ms5, TaMs26 and TaMs45, that sporophytically contribute to male fertility and yield recessive male sterility when mutated. While Ms1 and Ms5 are Triticeae specific genes, analysis of TaMs26 and TaMs45 demonstrated conservation of function across plant species. The main features of each of these genes is discussed with respect to the functional contribution of three sub-genomes and requirements for complementation of their respective mutants. Three seed production systems based on three genes, MS1, TaMS26 and TaMS45, were developed and a proof of concept was demonstrated for each system. The Tams26 and ms1 mutants were maintained through a TDNA cassette in a Seed Production Technology-like system, whereas Tams45 male sterility was maintained through creation of a telosome addition line. These genes represent different options for hybridization systems utilizing NGMS in wheat, which can potentially be utilized for commercial-scale hybrid seed production.

scholarly journals Research on Earthwork Calculation Based on TIN Model

2021 ◽  
Vol 248 ◽  
pp. 03001
Author(s):  
Wen Yongxiao ◽  
Yuan Xitun ◽  
Yang Xiongfei ◽  
Zhang Hang ◽  
Han Qi
Keyword(s):  
Grid Method ◽  
Mountainous Area ◽  
Triangular Prism ◽  
Accuracy Estimate ◽  
Engineering Construction ◽  
Square Grid ◽  
Network Method ◽  
The Cost ◽  
Selection Of ◽  
Better Than

In actual engineering construction, the calculation of earthwork directly affects the cost budget of the project and the selection of the optimal plan. Therefore, the calculation accuracy and efficiency of the earthwork are very important. This article introduces the construction principle of the TIN model. Based on the TIN model, the earthwork calculation is carried out by the triangular prism method. The data of a fill-excavation balance project in a rugged mountainous area is selected, and under different conditions, the TIN network method and the square grid method are used to calculate the earthwork, and the results are compared and analyzed with accuracy. Estimate. After comparative analysis, it is found that the earthwork calculation using the TIN network method is simple and cheap, and the calculation result is more accurate. It is better than the traditional square grid method as a whole, and can be used in the actual engineering earthwork calculation.

scholarly journals Identification and Confirmation of RAPD and SCAR Markers Linked to the ms-3 Gene Controlling Male Sterility in Melon (Cucumis melo L.)

2004 ◽  
Vol 129 (6) ◽  
pp. 819-825 ◽  
Author(s):  
Soon O. Park ◽  
Kevin M. Crosby ◽  
Rongfeng Huang ◽  
T. Erik Mirkov
Keyword(s):  
Male Sterility ◽  
Seed Production ◽  
Rapd Markers ◽  
Scar Marker ◽  
Rapd Marker ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Scar Markers ◽  
Male Sterile ◽  
The Cross

Male sterility is an important trait of melon in F1 hybrid seed production. Molecular markers linked to a male-sterile gene would be useful in transferring male sterility into fertile melon cultivars and breeding lines. However, markers linked to the ms-3 gene for male sterility present in melon have not been reported. Our objectives were to identify randomly amplified polymorphic DNA (RAPD) markers linked to the ms-3 gene controlling male sterility using bulked segregant analysis in an F2 population from the melon cross of line ms-3 (male-sterile) × `TAM Dulce' (male-fertile), convert the most tightly linked RAPD marker to the ms-3 gene into a sequence characterized amplified region (SCAR) marker based on a specific forward and reverse 20-mer primer pair, and confirm the linkage of the RAPD and SCAR markers with the ms-3 gene in an F2 population from the cross of line ms-3 × `Mission' (male-fertile). A single recessive gene controlling male sterility was found in F2 individuals and confirmed in F3 families. Two RAPD markers that displayed an amplified DNA fragment in the male-sterile bulk were detected to be linked to the ms-3 gene in the F2 population from the cross of line ms-3 × `TAM Dulce'. RAPD marker OAM08.650 was closely linked to the ms-3 gene at 2.1 cM. SCAR marker SOAM08.644 was developed on the basis of the specific primer pair designed from the sequence of the RAPD marker OAM08.650. The linked RAPD and SCAR markers were confirmed in the F2 population from the cross of line ms-3 × `Mission' to be consistently linked to the ms-3 gene at 5.2 cM. These markers were also present in 22 heterozygous fertile F1 plants having the ms-3 gene. The RAPD and SCAR markers linked to the ms-3 gene identified, and confirmed here could be utilized for backcrossing of male sterility into elite melon cultivars and lines for use as parents for F1 hybrid seed production.

scholarly journals Researches on the Influence of the Sowing Period of Simple Hybrids on Seed Production for the Turda 200 Maize Hybrid

2017 ◽  
Vol 74 (2) ◽  
pp. 79
Author(s):  
Alexandru B. GHEȚE ◽  
Ana COPÂNDEAN ◽  
Voichița V. HAȘ ◽  
Cornel CHEȚAN ◽  
Marcel DUDA ◽  
...  
Keyword(s):  
Seed Production ◽  
Certified Seed ◽  
Seed Quality ◽  
Quality Indices ◽  
Minimum Risk ◽  
Maize Hybrids ◽  
Adverse Conditions ◽  
Sowing Period ◽  
The Cost ◽  
Better Than

The production of certified seed for maize double hybrids is based on the crossing of two simple maize hybrids, one of which is used as a seed producer (maternal form, AxB) and another as pollinator (paternal form, CxD). The production of the seed in the case of double hybrids presents some advantages because the production obtained in the hybridization lot is high, the cost of lower seed production and includes a minimum risk (Penčić and Hadžistević, 1982). Seed quality indices are generally better than by simple hybrids, especially when adverse conditions occur during production (Sarca, 2004).

Predicting the rates of cross-pollination between GM and non-GM crops using RBFNN with SVM and bootstrap approach

2012 ◽  
Vol 1 (1) ◽  
pp. 84
Author(s):  
Chien-Pang Lee ◽  
Wen-Shin Lin ◽  
Bo-Jein Kuo ◽  
Kuo-Chung Chu
Keyword(s):  
Prediction Accuracy ◽  
Gm Crops ◽  
Support Vector ◽  
Cross Pollination ◽  
Bootstrap Approach ◽  
The Cross ◽  
The Cost ◽  
Reduce Execution Time ◽  
Better Than ◽  
Gm Technology

Recently, genetically modified (GM) technology has been successfully used to reduce the cost and to enhance the profit in agriculture. Although GM technology brings many benefits for non-food crops, people still misgive the effects of GM products for the health and the environment. Furthermore, GM crops might affect food (non-GM) crops in the open environment. Hence, how to find strategies for the coexistence of GM and non-GM crops are become a popular issue. One of the strategies is to determine a befitting distance between GM and non-GM crops to reduce the cross-pollination occurred by predicting the rate of cross-pollination. Owing to most of the existing methods for predicting the cross-pollination rates of non-GM crops are only based on the distance between GM and non-GM crops. To counter this problem, we propose a hybrid method, which is composed of radial basis function neural network (RBFNN), support vector machine (SVM) and bootstrap, to apply in this issue. The proposed method includes three specificities. (a) The proposed method reduces the effect of imbalance class problem. (b) The proposed method uses more variables, which are effect the cross-pollination rates, for prediction to enhance the prediction accuracy. (c) The proposed method searches relevant samples to reduce execution time and enhance the prediction accuracy. The results show the performance of our method is better than the existing methods in terms of the root mean square error (RMSE) in prediction and the correlation coefficient between the actual and the predicted cross-pollination rates.

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