scholarly journals Avances en la estrategia de mejoramiento genético para especies del género Acacia en la zona Centro Sur de Chile = Acacia species genetic improvement strategy advances central southern Chile

2021 ◽  
Vol 13 ◽  
pp. 121-132
Author(s):  
María Paz Molina Brand ◽  
Juan Carlos Pinilla Suárez
Keyword(s):  
Genetic Improvement ◽  
San Antonio ◽  
Southern Chile ◽  
Improvement Strategy ◽  
Acacia Species

En este trabajo se presentan los aspectos generales de la estrategia de mejoramiento genético formulada para especies del género Acacia en Chile. También se analizan y discuten los primeros resultados de 2 ensayos de progenies de 6 años, San Antonio de Elocoyan (A. dealbata) y Alhuemanque (A. melanoxylon), los cuales fueron establecidos durante el año 2000, en el marco de la implementación de la estrategia de mejoramiento para estas especies. En el caso de A. dealbata, atendiendo a su menor edad de rotación, se propone una selección a nivel de procedencias, familias e individuos, de modo de establecer una segunda generación de mejoramiento genético y seleccionar material superior para clonación y masificación de ganancias genéticas. Para A. melanoxylon se entregan solo antecedentes preliminares que deberán ser ratificados a una edad posterior.

Improvement of cropping systems by integration of rice breeding: a novel genetic improvement strategy

Euphytica ◽  
2008 ◽  
Vol 167 (2) ◽  
pp. 161-164 ◽  
Author(s):  
Michel Vales ◽  
Lucien Séguy ◽  
Serge Bouzinac ◽  
James Taillebois
Keyword(s):  
Genetic Improvement ◽  
Cropping Systems ◽  
Rice Breeding ◽  
Improvement Strategy

scholarly journals Influencing Factors of Grain Nutritional Quality and its Genetic Improvement Strategy in Rice

2020 ◽  
pp. 1-11
Author(s):  
Bo Peng ◽  
Qing-Xi Zhang ◽  
Xia-Yu Tian ◽  
Yan-Fang Sun ◽  
Xin-Hua Huang ◽  
...  
Keyword(s):  
Nutritional Quality ◽  
Genetic Improvement ◽  
Nutritional Value ◽  
Improvement Strategy ◽  
Rice Varieties ◽  
Factors Affecting ◽  
Nutrition Quality ◽  
The World ◽  
Main Food Source

Rice is one of the most important food crops in the world, and about half of the world’s population uses it as the main food source. China’s annual rice output accounts for about 34% of the world’s annual rice output, ranking first in the world, thus China is known as the "Rice Kingdom". Rice has high nutritional value, providing the human body with 35% of the total energy intake and about 28% of the required protein. Therefore, the nutritional value of rice is directly related to human nutrition and health. In this paper, the three aspects of rice nutrition and human health, factors affecting rice nutritional quality and genetic improvement of nutritional quality of rice are reviewed. The new challenges of rice nutrition quality were analyzed, and the prospect of improving rice nutritional quality was prospected. The results provide theoretical basis for genetic improvement of rice nutrition quality and cultivation of new high-quality rice varieties in the future.

Research on Improved Immune Genetic Algorithm and its Application in Integration Planning

2014 ◽  
Vol 998-999 ◽  
pp. 1058-1061
Author(s):  
Wu Xue Jiang ◽  
Min Xia Liu
Keyword(s):  
Genetic Algorithm ◽  
Genetic Improvement ◽  
Improved Genetic Algorithm ◽  
Improvement Strategy ◽  
Immune Genetic Algorithm ◽  
Simulation Experiments ◽  
Intelligence Algorithm ◽  
Integration Planning

In order to improve the efficiency of intelligence algorithm in integration planning and to avoid “premature” phenomenon, an improved genetic algorithm strategy-a method based on fitness density and scaling is proposed in the paper. It applies a new encoding way of integration planning. The two examples of simulation experiments show that the genetic improvement strategy could significantly reduce solving algebra and prevent “premature” phenomenon.

scholarly journals Quantitative and Qualitative Genetic Studies of Some Acacia Species Grown in Egypt

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 243
Author(s):  
Nader R. Abdelsalam ◽  
Hayssam M. Ali ◽  
Mohamed Z. M. Salem ◽  
Hosam E. El-Wakil
Keyword(s):  
Genetic Differentiation ◽  
Genetic Resources ◽  
Genetic Improvement ◽  
Plant Genetic Resources ◽  
Morphological Data ◽  
Genetic Studies ◽  
Acacia Species ◽  
Improvement Programs ◽  
Similarities And Differences ◽  
Qualitative Characteristics

The objective of the current work is to study the genetic differentiation between Acacia species growing in Egypt as plant genetic resources based on morphological, biochemical, and molecular markers. The 20 replicates of Acacia tree collected from four localities from Egypt were A. tortilis ssp. raddiana and A. farnesiana (Siwa Oasis and Borg El-Arab City), A. stenophylla, A. sclerosperma (Marsa Matroh City), and A. saligna (Abis Station Farm, Alexandria). The results based on the previous markers indicated highly significant differences between Acacia species, confirming the hypothesis of the possibility of using morphological, biochemical, and molecular parameters in species identification. Qualitative characteristics results indicated some similarities and differences that are taxonomically important for comparing taxonomical grouping with morphological data for the genetic description of Acacia species. The activities of antioxidant enzymes have been studied intensively and the results provide strong similarities between the Acacia species (69%), between A. raddiana (Siwa and Borg Al-Arab) and A. saligna, followed by all Acacia species (50%). Finally, the molecular studies showed that a total of 563 amplification fragments, 190 fragments were monomorphic, and 373 fragments were polymorphic. The highest number of amplification fragments (21) was detected with OPB-20 primer, while OPA-20 showed seven amplification fragments; the average number was 13.09. The results indicated that Acacia species exhibit high genetic differentiation, helpful in the future for genetic improvement programs. The novelty of the current study is highlighting the importance of plant genetic resources in Egypt and using different techniques to measure the differentiation between these species.

A tale of two genera: exotic Eucalyptus and Acacia species in China. 1. Domestication and research

2020 ◽  
Vol 22 (1) ◽  
pp. 1-18
Author(s):  
R.J. Arnold ◽  
Y.J. Xie ◽  
J.Z. Luo ◽  
H.R. Wang ◽  
S.J. Midgley
Keyword(s):  
Genetic Resources ◽  
Genetic Improvement ◽  
Southern China ◽  
Factors Affecting ◽  
Acacia Species ◽  
The Past ◽  
Breeding Populations ◽  
Eucalypt Plantations ◽  
Production Capacities ◽  
Work Done

In China a substantial plantation industry, including 5.4 M ha of eucalypts and up to 50,000 ha of acacias, has been built on a foundation of R&D and germplasm acquisition for exotic eucalypt and acacia species over the past 40 years. From the 1980s through to the early 2000s a suite of Chinese-Australian collaborative R&D projects made major contributions to domestication, genetic improvement, silviculture and other aspects of plantation eucalypts and acacias in southern China. Even today, germplasm derived from earlier projects still provides the majority of planting stock deployed in China's current eucalypt plantations. For eucalypts, improvements in plantation productivities have been achieved through solid, well managed R&D programs. For acacias, despite work done in past decades to develop breeding populations and production capacities for improved seeds, genetic resources of acacias in China have deteriorated greatly in recent years. Factors affecting domestication and genetic improvement of both genera in China are reviewed in this report along with the research undertaken for both genera over the past 40 years.

scholarly journals Obtaining Triploid Hybrids by Means of Open Pollinations and Controlled Crosses Involving Diploids Parental

2019 ◽  
Vol 11 (5) ◽  
pp. 195
Author(s):  
Reisane Teles Santiago ◽  
Antônio da Silva Souza ◽  
Carlos Alberto da Silva Ledo ◽  
Lucas Aragão da Hora Almeida ◽  
Karen Cristina Fialho dos Santos ◽  
...  
Keyword(s):  
South Africa ◽  
Flow Cytometry ◽  
Environmental Conditions ◽  
Genetic Improvement ◽  
Woody Plant ◽  
The State ◽  
Improvement Strategy ◽  
Chapada Diamantina ◽  
Woody Plant Medium ◽  
Controlled Crosses

The creation of triploid hybrids is an important genetic improvement strategy for the development of new commercial citrus scion varieties. The objective of this work was to quantify the frequency of triploids obtained from natural and controlled crosses of different mandarin varieties under varying environmental conditions in the state of Bahia. The experiments were conducted in the municipalities of Cruz das Almas (Recôncavo Baiano region) and Mucugê (Chapada Diamantina region). The first experiment was based on fruits from open pollinations of the varieties ‘Page’, ‘Ortanique’, ‘Ellendale’, ‘Clemenules’, ‘Swatow’, ‘Piemonte’, ‘Fortune’, ‘South Africa’, ‘Montenegrina’, ‘Kincy’, ‘Span Americana’, ‘Fremont, ‘Nova’, ‘Dancy’ and ‘Murcott’, and the second involved fruits from controlled crosses of female parents ‘Nova’, ‘Fortune’ and ‘Ortanique’ and male parents ‘Page’, ‘Montenegrina’, ‘Swatow’, ‘Fremont’ and ‘Kincy’. The seeds selected were inoculated in test tubes containing approximately 10 mL of Woody Plant Medium (WPM). When the plants reached circa 60 days of age, leaf samples were removed for quantification of the DNA by the flow cytometry technique. In Mucugê, three triploids were identified from open pollinations, ‘Clemenules’ (1) and ‘Ortanique’ (2), while in Cruz das Almas, no triploids were obtained. In the controlled crosses, triploids were only obtained in Mucugê: ‘Ortanique’ × ‘Montenegrina’ (4), ‘Ortanique’ × ‘Kincy’ (1) and ‘Ortanique’ × ‘Swatow’ (2). Based on the data, it is suggested that the environmental conditions of Mucugê favored the formation of triploids.

Welfare, Children, and Families: A Three-City Study (Boston, Chicago, and San Antonio) Embedded Developmental Study, Wave 1,1999

1999 ◽  
Author(s):  
P. Lindsay Chase-Lansdale ◽  
◽  
Ronald Angel ◽  
Linda Burton ◽  
Andrew Cherlin ◽  
...  
Keyword(s):  
San Antonio ◽  
Developmental Study ◽  
Children And Families
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