Prediction of direct and indirect genetic gains and genotypic correlations in rubber tree progenies

The objective of this work was to estimate the genetic parameters, genotypic and phenotypic correlations, and direct and indirect genetic gains among and within rubber tree (Hevea brasiliensis) progenies. The experiment was set up at the Municipality of Jaú, SP, Brazil. A randomized complete block design was used, with 22 treatments (progenies), 6 replicates, and 10 plants per plot at a spacing of 3x3 m. Three‑year‑old progenies were assessed for girth, rubber yield, and bark thickness by direct and indirect gains and genotypic correlations. The number of latex vessel rings showed the best correlations, correlating positively and significantly with girth and bark thickness. Selection gains among progenies were greater than within progeny for all the variables analyzed. Total gains obtained were high, especially for girth increase and rubber yield, which were 93.38 and 105.95%, respectively. Young progeny selection can maximize the expected genetic gains, reducing the rubber tree selection cycle.

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Genetic parameters and estimated genetic gains in young rubber tree progenies

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2013000400009 ◽

2013 ◽

Vol 48 (4) ◽

pp. 411-416 ◽

Cited By ~ 4

Author(s):

Cecília Khusala Verardi ◽

Erivaldo José Scaloppi Junior ◽

Guilherme Augusto Peres Silva ◽

Lígia Regina Lima Gouvêa ◽

Paulo de Souza Gonçalves

Keyword(s):

Genetic Gain ◽

Genetic Parameters ◽

Block Design ◽

Rubber Tree ◽

First Year ◽

Genetic Gains ◽

Selection Gain ◽

Randomized Block Design ◽

Using Data ◽

Selection Of

The objective of this work was to assess the genetic parameters and to estimate genetic gains in young rubber tree progenies. The experiments were carried out during three years, in a randomized block design, with six replicates and ten plants per plot, in three representative Hevea crop regions of the state of São Paulo, Brazil. Twenty-two progenies were evaluated, from three to five years old, for rubber yield and annual girth growth. Genetic gain was estimated with the multi-effect index (MEI). Selection by progenies means provided greater estimated genetic gain than selection based on individuals, since heritability values of progeny means were greater than the ones of individual heritability, for both evaluated variables, in all the assessment years. The selection of the three best progenies for rubber yield provided a selection gain of 1.28 g per plant. The genetic gains estimated with MEI using data from early assessments (from 3 to 5-year-old) were generally high for annual girth growth and rubber yield. The high genetic gains for annual girth growth in the first year of assessment indicate that progenies can be selected at the beginning of the breeding program. Population effective size was consistent with the three progenies selected, showing that they were not related and that the population genetic variability is ensured. Early selection with the genetic gains estimated by MEI can be made on rubber tree progenies.

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Prediction of genetic gains with selection between and within S2 progenies of papaya using the REML/Blup analysis

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2017001200005 ◽

2017 ◽

Vol 52 (12) ◽

pp. 1167-1177 ◽

Cited By ~ 1

Author(s):

Tamiris Pereira da Silva ◽

Francisco das Chagas Vidal Neto ◽

Júlio César Do Vale

Keyword(s):

Genetic Gain ◽

Carica Papaya ◽

Genetic Parameters ◽

Block Design ◽

Stem Diameter ◽

Average Mass ◽

Genetic Gains ◽

Randomized Complete Block Design ◽

Selection Of

Abstract: The objective of this work was to predict the genetic gains with selection of superior individuals within papaya (Carica papaya) progenies using the REML/Blup analysis. Thirty-six S2 progenies, originated from the Calimosa and Tainung 1 hybrids, and two commercial control checks were evaluated in a randomized complete block design, with four replicates. The following traits were evaluated: heights of plants and first fruit; stem diameter at 12 and 18 months; number of days required for fruiting; number, mass, and average mass of commercial fruit; and number and mass of carpelloid and pentandric fruit. The magnitudes of the genetic parameters indicated that the variability present in most of the characters allows greater genetic gain if the selection is made at the progeny level, and not in individual plants. For selection among progenies, PROT-268, PROT-74, PROT-55, and PROT-22 were the most promising, with the greatest genetic gain for the studied characters. In the selection among and within progenies, the prediction of the gains is higher for the increase in the expression of the number of commercial fruit and for the decrease in the expression of pentandric fruit.

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Seed Yam Production Using High-Quality Minitubers Derived from Plants Established with Vine Cuttings

Agronomy ◽

10.3390/agronomy11050978 ◽

2021 ◽

Vol 11 (5) ◽

pp. 978

Author(s):

Beatrice Aighewi ◽

Norbert Maroya ◽

Lava Kumar ◽

Morufat Balogun ◽

Daniel Aihebhoria ◽

...

Keyword(s):

Block Design ◽

Research Station ◽

International Institute ◽

Tropical Agriculture ◽

Single Node ◽

Cropping Season ◽

Randomized Complete Block Design ◽

The World ◽

Cropping Seasons ◽

Set Up

Yam (Dioscorea spp.) is a valuable food security crop in West Africa, where 92% of the world production occurs. The availability of quality seed tubers for increased productivity is a major challenge. In this study, minitubers weighing 1, 3, and 5 g produced from virus-free single-node vine cuttings of two improved yam varieties (Asiedu and Kpamyo) growing in an aeroponics system were assessed for suitability in seed production at a population of 100,000 plants ha−1. A 3 × 2 factorial experiment with randomized complete block design and three replications was set up during the cropping seasons of 2017 to 2019 at the International Institute of Tropical Agriculture Research Station in Kubwa, Abuja, Nigeria. Results showed field establishments of 87%–97.8%. Yields differed with minituber size, variety, and cropping season; the highest was 31.2 t ha−1 in 2019 and the lowest, 10 t ha−1 in 2018 from 5 and 1 g Kpamyo minitubers, respectively. The estimated number of tubers produced per hectare by 1, 3, and 5 g minitubers was 101,296, 112,592, and 130,555, with mean weights per stand of 159.2, 187.3, and 249.4 g, respectively. We recommend using less than 6 g minitubers for seed yam production due to their high multiplication rates.

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Bioefficacy of some biorational insecticides for the control of Aphis gossypii Glover, 1877, (Hemiptera: Aphididae) on greenhouse grown cucumber

Acta agriculturae Slovenica ◽

10.14720/aas.2016.107.2.14 ◽

2016 ◽

Vol 107 (2) ◽

pp. 419 ◽

Cited By ~ 1

Author(s):

Mohammad Saeed Emami

Keyword(s):

Broad Spectrum ◽

Block Design ◽

Aphis Gossypii ◽

Coconut Oil ◽

Randomized Complete Block Design ◽

Aphis Gossypii Glover ◽

Sodium Sulfosuccinate ◽

Set Up

Aphis gossypii Glover, 1877 is a serious pest of cucumber in greenhouse plantings. Biorational insecticides are an alternative of broad spectrum insecticides for aphid suppression in greenhouse. In this regards, the efficiency of some biorational insecticides including soap based on coconut oil, surfactant based on sodium sulfosuccinate and antifeeding based on potassium nicotinate were assayed on A. gossypii in the cucumber greenhouse. The trials were set up in a randomized complete block design with four replications. Samplings were carried out one day before spraying and 3, 7, 14 and 21 days after spraying. The data were submitted to ANOVA and the means comparison was performed using Duncan’s test. The results indicated that the highest mortality in insecticidal soap, surfactant and antifeeding treatments occurred after 3 days, with 78.47 %, 67.16 % and 60.48 % mortality, respectively. The results of the trials are discussed in terms of improving management of the populations of A. gossypii.

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Alternatives to sowing vegetable type soybeans

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89131998000400007 ◽

1998 ◽

Vol 41 (4) ◽

pp. 429-436 ◽

Cited By ~ 1

Author(s):

Edcarlos Mannfredini ◽

Deonisio Destro ◽

Martin Homechin ◽

Gustavo Sachsida ◽

Édison Miglioranza

Keyword(s):

Plant Height ◽

Block Design ◽

Germination Percentage ◽

Flowering Plant ◽

Food Type ◽

Individual Plant ◽

Crop Failure ◽

Randomized Complete Block Design ◽

Set Up ◽

Disposable Plastic

Today, soybean crops of the Tamba Kurodaisu cultivar are sown in beds prior to transplantation to the field. This planting system has caused crop failure due to damage to the root system. An experiment to test different sowing alternatives to obtain plantlets for cropping of food type big seeded soybean was set up with the following treatments: sowing in beds; sowing in 130 cm³ newspaper cups; sowing in test tubes of volumes of 30 cm³, 60 cm³ and 70 cm³; sowing in 70 cm³ disposable plastic cups; sowing on 90 cm³ styrofoam trays. A randomized complete block design was used, and the following traits were assessed: germination percentage; number of days to flowering; plant height at flowering; number of days to maturity; plant height at maturity; number of seeds per plant; individual plant yield; weight of a hundred seeds. Results should that three methods could be used to set up Tamba Kurodaisu cultivar crops: sowing in disposable plastic cups, sowing in beds with later transplant, or direct sowing in the field.

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Phenotypic stability and genetic gains in six-year girth growth of Hevea clones

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x1999000700015 ◽

1999 ◽

Vol 34 (7) ◽

pp. 1223-1232 ◽

Cited By ~ 9

Author(s):

Paulo de Souza Gonçalves ◽

Alberto Kazutoshi Fujihara ◽

Altino Aldo Ortolani ◽

Ondino Cleante Bataglia ◽

Nelson Bortoletto ◽

...

Keyword(s):

Experimental Design ◽

Regression Coefficient ◽

Block Design ◽

Rubber Tree ◽

Phenotypic Stability ◽

Plateau Region ◽

Genetic Gains ◽

Paulo State ◽

Randomized Block Design ◽

Clonal Variance

Rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Müell. Arg.] budgrafts of seven clones were evaluated on five contrasting sites in the plateau region of the São Paulo State, Brazil. The objective of this work was to study the phenotypic stability for girth growth. The experimental design was a randomized block design with three replications and seven treatments. Analysis of variance of girth at six-year plant growth indicated a highly significant clone x site interaction. Only linear sites and clone x site components of clone x year interaction were significant, indicating that the performance of clones over sites for this trait could be predicted. The clones GT 1 and PB 235 showed the greatest stability in relation to girth growth, with foreseen responses to change, introduced in the sites. The clones PB 235 and IAN 873 showed significative difference in relation to regression coefficient, representing clones with specific adaptability on favorable and unfavorable sites respectively. The clone GT 1 became the most promissory one in the study of stability and adaptability even showing low girth growth. Expected genetic gains from planting sites, along with estimates of clonal variance and repeatability of clonal means are generally greatest or close to the greatest when selection is done at the same site.

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Plantain-Tree Rubber Intercropping Systems Improved Productivity in the Tropical Humid Zone of Ghana, West Africa

International Journal of Agronomy ◽

10.1155/2021/3240686 ◽

2021 ◽

Vol 2021 ◽

pp. 1-16

Author(s):

Erasmus Narteh Tetteh ◽

Eric Owusu Danquah ◽

Akwasi Adutwum Abunyewa ◽

Caleb Melenya Ocansey ◽

Emmanuel Amoah Boakye ◽

...

Keyword(s):

Population Density ◽

Growth And Development ◽

Positive Relationship ◽

Cropping Systems ◽

Block Design ◽

Rubber Tree ◽

Western Region ◽

Optimum Population ◽

Randomized Complete Block Design ◽

Sole Cropping

A three-year field trial was conducted between 2014 and 2017 in the Ellembelle and Jomoro districts of the Western region of Ghana where rubber production is common to determine the optimum population density of plantain when grown in combination with immature rubber tree crops. The trials were arranged in a Randomized Complete Block Design with 3 replications. The treatments were sole rubber, sole plantain, and three intercrops of one row of plantain in between two rows of rubber, two rows of plantain in between two rows of rubber, and three rows of plantain in between two rows of rubber. The rubber clone used was GT1 while the variety of plantain used was false horn. The results showed that population density of plantain had significant effect on the growth of the associated rubber. Growing plantain at closer spacing of 1.5 m under the high-density plantain treatment significantly increased plantain yield compared to the other cropping systems. There was a significant positive relationship between population density of plantain and the rubber tree growth and development. The optimum population density of plantain when intercropped with rubber was 1,666/ha. The study showed intercropping was advantageous over sole cropping for both crops.

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VARIAÇÃO LONGITUDINAL E EFEITO DO ESPAÇAMENTO NA MASSA ESPECÍFICA BÁSICA DA MADEIRA DE Mimosa scabrella E Ateleia glazioveana

FLORESTA ◽

10.5380/rf.v43i2.29266 ◽

2013 ◽

Vol 43 (2) ◽

pp. 327 ◽

Cited By ~ 2

Author(s):

Elder Eloy ◽

Braulio Otomar Caron ◽

Rômulo Trevisan ◽

Denise Schmidt ◽

Magda Lea Bolzan Zanon ◽

...

Keyword(s):

Block Design ◽

Wood Quality ◽

Basic Density ◽

Technological Characteristic ◽

Diameter At Breast Height ◽

Breast Height ◽

Living Space ◽

Randomized Complete Block Design ◽

Axial Variation ◽

Set Up

Este trabalho teve como objetivo avaliar a variação longitudinal e o efeito do espaçamento de plantio na massa específica básica das árvores de Mimosa scabrella Benth e Ateleia glazioveana Baill, aos 36 meses de idade. Analisou-se um experimento instalado em delineamento de blocos completos casualizados, com três repetições. Os tratamentos foram definidos em função dos espaçamentos (2,0x1,0 m, 2,0x1,5 m, 3,0x1,0 m e 3,0x1,5 m). Foram avaliadas 72 árvores, sendo essas medidas e cubadas pelo método de Smalian. Em seguida, foram retirados discos nas posições do tronco: 0,10 m (base), 1,30 m do solo (DAP – Diâmetro a Altura do Peito), 25%, 50% e 75% da altura total da árvore, para determinação da massa específica básica. A massa específica básica em árvores de Mimosa scabrella apresentou um decréscimo até a região do DAP, seguido de acréscimo, sem tendência de estabilização com a altura. A Ateleia glazioveana apresentou uma tendência de decréscimo no sentido base-topo das árvores. Os espaçamentos influenciaram a variação da massa específica básica em árvores de Mimosa scabrella e Ateleia glazioveana, não sendo verificada uma variação sistemática positiva ou negativa em relação ao espaço vital proporcionado.Palavras-chave: Variação axial; característica tecnológica da madeira; qualidade da madeira; espaçamento de plantio. AbstractLongitudinal variation and effect of spacing on basic density wood of Mimosa scabrella and Ateleia glazioveana. This study aimed to evaluate the variation in length and effect of spacing of the basic density of Mimosa scabrella Benth e Ateleia glazioveana Baill, trees with 36 months of age. We analyzed an experiment set up in randomized complete block design with three replications. The treatments were defined by the spacing (2.0x1.0 m, 2.0x1.5 m, 3.0x1.0 m, 3.0x1.5 m). 72 trees were evaluated, and these measures and scaled by the method of Smalian. Then, the disks were removed from the trunk positions: 0.10 m (base), 1.30 m (DAP - diameter at breast height), 25%, 50% and 75% of the total height of the tree, determining the basic density. The basic density in trees of Mimosa scabrella showed a decrease to the region of the DAP, followed by addition, without a tendency to stabilize with time. The Ateleia glazioveana showed a decreasing trend towards bottom-up tree. The spacing influenced the variation of basic density in trees of Mimosa scabrella e Ateleia glazioveana not been verified a systematic positive or negative trend in relation to the living space provided. Keywords: Axial variation; technological characteristic of wood; wood quality; planting space.

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Plot size for evaluation of Arabica coffee yield

Acta Scientiarum Agronomy ◽

10.4025/actasciagron.v41i1.42712 ◽

2019 ◽

Vol 41 ◽

pp. e42712

Author(s):

Bráulio Fabiano Xavier de Moraes ◽

Fernando Henrique Ribeiro Barroso Toledo ◽

Kaio Olímpio das Graças Dias ◽

Vinícius Teixeira Andrade ◽

Daniel Furtado Ferreira ◽

...

Keyword(s):

Block Design ◽

Basic Unit ◽

Parameter Estimates ◽

Coffee Production ◽

Resampling Methods ◽

Arabica Coffee ◽

Plot Size ◽

Coffee Yield ◽

Randomized Complete Block Design ◽

Set Up

In most cases, in genetic breeding of Arabica coffee, plot size is defined in an empirical manner. It is often based only on the experience of the breeders and the availability of resources, potentially leading to a reduction in precision. Therefore, the aim of this study was to estimate the size of the experimental plot for evaluation of coffee yield. We evaluated two experiments for validation of cultivars with 12 treatments set up in a randomized complete block design with three replicates and plots composed of 50 plants. Each plant was considered as a basic unit. Estimates of ideal plot size were made by maximum curvature of the coefficient of variation, linear-plateau segmented model and by the resampling methods. We discussed the variations in the parameter estimates for different plot sizes. Divergence was seen among the plot sizes estimated by the different methodologies. Increasing the number of plants per plot led to a higher experimental precision to the point that the increase was no longer significant. The plot size recommended for evaluating coffee production is from seven to 19 plants.

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Performance of Six Genotypes of Tritordeum Compare to Bread Wheat under East Mediterranean Condition

Sustainability ◽

10.3390/su12229700 ◽

2020 ◽

Vol 12 (22) ◽

pp. 9700

Author(s):

Ioanna Kakabouki ◽

Dimitrios F. Beslemes ◽

Evangelia L. Tigka ◽

Antigolena Folina ◽

Stella Karydogianni ◽

...

Keyword(s):

Bread Wheat ◽

Block Design ◽

Wheat Yield ◽

Significance Level ◽

Yield And Quality ◽

Gluten Content ◽

Significant Difference ◽

Randomized Complete Block Design ◽

Dry Conditions ◽

Set Up

Four advanced tritordeum lines were studied and compared to two commercial varieties of tritordeum and wheat cultivars in yield and quality features, in Greece. For this purpose, a two-year experiment was established in the Greek territory. The field experiment was set up in Randomized Complete Block Design (RCBD) with blocks, with different lines and varieties. Head emergence was calculated based on Growing Degree Days (GDDs), which was significantly affected by the year. The significance of differences between treatments was estimated by using Fisher’s least significant difference (LSD) test with significance level p = 0.05. The weight of 1000 seeds of the two commercial varieties differed from the equivalent weight of 1000 seeds of tritordeum lines, approximately 1 g. Yield was significantly affected by lines/varieties and year. Compared to tritordeum yield, wheat yield marked the highest values. This difference was almost 2 kg ha−1. Gluten content was significantly affected by lines/varieties. The highest gluten content was firstly noticed at wheat GENESIS (34.2%) variety and secondly at tritordeum Aucan (33.2%) variety. Protein was higher in tritordeum lines HT-1704 (15.5%), HT-1707 (15.1%) and Aucan variety (15.2%) during the first experimental year. Tritordeum seems to have significant adaptability to dry conditions in Greece and significant yields compared to the existing commercial varieties and bread wheat.

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