scholarly journals Aplicación de metodologías participativas para el mejoramiento genético de frijol en Honduras.

2006 ◽  
Vol 12 (2) ◽  
pp. 219 ◽  
Author(s):  
Juan Carlos Rosas
Keyword(s):  
Plant Breeding ◽  
Central America ◽  
Crop Production ◽  
Participatory Plant Breeding ◽  
Small Farmers ◽  
Improved Varieties ◽  
Golden Yellow ◽  
The Common ◽  
Bean Research ◽  
Yield Responses

Even though it is recognized that traditional plant breeding approaches have been effective on increasing yields and solving pest problems that limit crop production, it is still argued that the levels of adoption, and expected impacts, have been limited. Small farmers who produced most of the basic grains are included under this context; they do not posses the resources to change their environment to obtain the yield responses that are expected from improved varieties with higher potential. However, in the case of beans in Central America, improved varieties developed by conventional plant breeding methods have been valuable in reducing the dissemination of diseases that could have caused severe yield reductions in the region, i.e. bean golden yellow mosaic. Participatory plant breeding (PPB), which involves an active farmer participation in the development of varieties for specific adaptation, is an alternative for increasing the access and adoption of improved varieties by small farmers who have limited access to improved technologies and/or use low inputs. In Central America, already exists some initiatives of PPB in bean and maize crops; regarding with these initiatives, the interests and expectations of farmers, organizations and donors have increased recently. This publication intents to provide some guidelines on the application of PPB approaches for the genetic improvement of the common bean; it is based in the experience obtained by breeders of the Bean Research Program of Zamorano, during the first two years of a project conducted in collaboration with technical personnel of a nongovernmental organization and farmers from various communities of Yorito and the Lago Yojoa in Honduras.

Improving Soybean Production Using Light Supplementation at Field-Scale: A Case Study

2021 ◽  
Vol 9 (3) ◽  
pp. 259
Author(s):  
Ernane M Lemes ◽  
Breno N R Azevedo ◽  
Matheus F I Domiciano ◽  
Samuel L Andrade
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Crop Production ◽  
High Efficiency ◽  
Field Scale ◽  
Soybean Crop ◽  
Illumination System ◽  
Progress Curve ◽  
Commercial Area ◽  
Yield Responses

In modern agriculture, there is a growing need for increasing crop efficiency while minimizing environmental impacts. The use of high-efficiency light supplementation to enhance plant development is limited for high-productive crops at field conditions (outdoor). This study evaluated the soybean plant’s yield responses in an open commercial area (field scale) cultivated under conditions of artificial light supplementation. A commercial irrigated (pivot) area received an illumination system for light supplementation (LS) in its inner pivot spans. About 40 hours of LS were applied to the plants during the soybean crop cycle. The area’s outer pivot spans did not receive light supplementation (nLS). The internode number, the plant height, the pods per plant were evaluated weekly to compute the area under the progress curve (AUPC). The grain yield at harvest was also assessed. The AUPC of the internode number, plant height and pods per plant were positively affected by the LS treatment. The regular soybean cycle (nLS) is about 17 weeks; however, the LS harvest occurred three weeks later. Light supplementation increased soybean grain yield by 57.3% and profitability by 180% when compared to nLS. Although light supplementation at field scale poses a challenge, it is now affordable since sustainable field resistant technologies are now available. The present study is the first known report of light supplementation used to improve soybean crop production at field scale.

scholarly journals Climate Smart Agriculture as Final Goal: Use of Improved Cereals Varieties in Cinzana, Mali.

2017 ◽  
Vol 5 (1) ◽  
pp. 50
Author(s):  
Kalifa TRAORE ◽  
Daouda SIDIBE ◽  
Harouna COULIBALY
Keyword(s):  
Food Security ◽  
Water Conservation ◽  
Crop Production ◽  
Heavy Rain ◽  
Sub Saharan Africa ◽  
Improved Varieties ◽  
Farmer Organizations ◽  
Conservation Technology ◽  
Sub Saharan ◽  
Smart Agriculture

Climate variability and change are recognized as the greatest challenge to crop production and food security in sub-Saharan Africa. This work assesses farmers’ perception on the contribution of improved varieties of sorghum and millet in the search for food security in Cinzana rural commune of Mali in the current context of climate change.The methodology was based on focus group surveys with both, the decentralized technical services, administrative and municipal authorities, NGOs, farmer organizations and producers but also farmer exchanges visits on improved varieties tested in farmer’s field.The result shows that climate change is described by the majority of farmers (87%) as decrease in rainfall amount and length of rainy seasons, high increases in temperature and high deforestation and water scarcity. Unpredictability of climate, (80%), drought (70%) and heavy rain (65%) occurrence were identified as major perception of farmers on risks in climate for crop production and soil degradation. After farmers’ study tour, 80% of the participants mentioned a better growth of plants and increase of soil moisture with the use of contour ridges tillage as a water conservation technology. Adapted cycle (55%) and higher yield (37%) of improved varieties were farmer’s main drivers for adoption of improved millet and sorghum varieties.The study revealed that local farmers have substantial knowledge on climate variabilities and risks and also are aware of some adaptation strategies. However, for wide scale adoption of effective strategies, capacity strengthening appeared a prerequisite.

scholarly journals Alternative breeding processes: at which extent Participatory Breeding should modify the concept of ideotypes in plant breeding?

OCL ◽  
2018 ◽  
Vol 25 (6) ◽  
pp. D606 ◽  
Author(s):  
Patrick Vincourt ◽  
Pierre Carolo
Keyword(s):  
Plant Breeding ◽  
Agricultural Production ◽  
Developed Countries ◽  
Limiting Factors ◽  
Participatory Plant Breeding ◽  
Participatory Breeding ◽  
General Expectation ◽  
The Developed Countries ◽  
Definition Of ◽  
Alternative Organizations

The Participatory Plant Breeding (PPB) concept emerged twenty years ago, particularly with the aim to build alternative organizations of the plant breeding activities in developing countries. It now as well questions the developed countries, in the frame of a more global expectation to make all the stakeholders more involved in the agricultural production, from the farmers to its final clients. We discuss here some of the questions addressed by this trend with regard to the definition of the ideotype: (a) different forms of PPB? (b) changing the paradigm: Client Oriented Breeding? (c) a new way to manage {genotype * environment} interactions? (d) mainly societal concerns at stake? (e) biodiversity and ideotypes. As the same key, technical, limiting factors are involved in both PPB and classical breeding, it is suggested to consider PPB as one of the ways in the frame of a general expectation for diversification, thus eventually resulting in the promotion of alternative ideotypes, rather than an alternative process.

scholarly journals Detecting bean golden yellow mosaic virus in bean breeding lines and in the common legume weed Macroptilium lathyroides in Puerto Rico.

1969 ◽  
Vol 85 (3-4) ◽  
pp. 165-176
Author(s):  
Lydia I. Rivera-Vargas ◽  
Vilmaris Bracero-Acosta ◽  
James S. Beaver ◽  
Dan E. Purcifull ◽  
Jane E. Polston ◽  
...  
Keyword(s):  
Puerto Rico ◽  
Mosaic Virus ◽  
Yellow Mosaic Virus ◽  
Phaseolus Vulgaris L ◽  
Breeding Lines ◽  
Golden Yellow ◽  
Enzymelinked Immunosorbent Assay ◽  
The Common ◽  
Polymerase Chain ◽  
Macroptilium Lathyroides

Bean golden yellow mosaic virus (BGYMV) is a geminivirus transmitted by whiteflies (Genus: Bemisia). This virus causes significant fosses in common bean (Phaseolus vulgaris L.). Serological techniques such as enzymelinked immunosorbent assay (ELISA) have been widely used for detection of viruses. We evaluated existing monoclonal antibodies (3F7,2G5 and 5C5) for the detection of BGYMV isolates in bean fines in Puerto Rico. Monoclonal antibody 3F7 was the most effective in detecting the virus in tissues of line DOR 364 and susceptible cuftivars Top Crop and Quest. However, it was not effective in the detection of BGYMV in lines of DOR 303, which showed typical symptoms. Sampfes from Macroptilium lathyroides, a weed that might be a possible reservoir of the virus, were also tested for viraf infection. ELISA tests were inconclusive for detection of geminiviruses in M. lathyroides. Polymerase Chain Reaction (PCR) was also used to complement BGYMV diagnosis in M. lathyroides and in bean lines that showed symptoms but were negative for the ELfSA test. Two sets of primers, specific for Begomovirus such as BGYMV, were used in PCR experiments. Using PCR, we were able to detect the virus in the line DOR 303 and in M. lathyroides tissues.

scholarly journals Neoxabea mexicana sp. nov. (Gryllidae: Oecanthinae): A new species from Mexico and a key for Neoxabea in North and Central America

2021 ◽  
Vol 30 (2) ◽  
pp. 99-106
Author(s):  
Nancy Collins ◽  
Carlos Gerardo Velazco-Macias
Keyword(s):  
New Species ◽  
Central America ◽  
Calling Song ◽  
Sound Recordings ◽  
Tree Cricket ◽  
The Status ◽  
Male Calling ◽  
The Common ◽  
A New Species ◽  
Rule Out

A new species of tree cricket, Neoxabea mexicanasp. nov., is described from northeast Mexico. Although it has morphological similarities to two other species found in Mexico, there are distinguishing characters, such as a well-developed tubercle on the pedicel, black markings on the maxillary palpi, one of the two pairs of spots on the female wings positioned at the base of the wings, stridulatory teeth count, and the pulse rate of the male calling song. The calling song description and pre-singing stuttering frequencies are provided. Character comparisons that rule out other species in the genus are presented. The common name given to this new species is Mexican tree cricket. Sound recordings and video are available online. We also make some clarification of the status of Neoxabea formosa (Walker, 1869), described as Oecanthus formosus, and present a key of Neoxabea in North and Central America.

scholarly journals Mosca-Branca, Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae) em feijoeiro: Características gerais, bioecologia e métodos de controle

2017 ◽  
Vol 10 (1) ◽  
pp. 01-08
Author(s):  
Anderson Gonçalves da Silva ◽  
Arlindo Leal Boiça Junior ◽  
Bruno Henrique Sardinha de Souza ◽  
Eduardo Neves Costa ◽  
James da Silva Hoelhert ◽  
...  
Keyword(s):  
Common Bean ◽  
Bemisia Tabaci ◽  
Crop Production ◽  
Insect Pests ◽  
Economic Losses ◽  
Common Beans ◽  
Bean Plants ◽  
De Se ◽  
Before And After ◽  
The Common

Resumo. A cultura do feijoeiro pode ser infestada por insetos que afetam a produção antes e após a colheita, tendo como estimativa de perdas causadas nos rendimentos pelas pragas variando de 33 a 86%. Dentre essas pragas a mosca-branca Bemisia tabaci (Genn.) Autor merece destaque. Esta ocasiona danos diretos decorrentes de sua alimentação e indiretos que ocorrem por meio da excreção açucarada de honeydew ou “mela” e simbiose com a fumagina. No entanto, o dano mais sério causado pela B. tabaci é a transmissão de viroses como o mosaico-dourado-do-feijoeiro, provocando perdas econômicas que podem variar de 30% a 100%. Desse modo, o objetivo do presente estudo é disponibilizar informações a respeito de aspectos importantes de B. tabaci, como: histórico e distribuição geográfica, bioecologia e dinâmica populacional, plantas hospedeiras, métodos de controle adotados, dentre outros, a fim de se fornecer subsídios para futuras pesquisas sobre a mosca-branca em feijão.Whitefly Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae) in common beans: General characteristics, bioecology, and methods of controlAbstract. Common bean plants are infested by insects, which can ultimately affect the crop production before and after harvest, with estimated losses ranging from 33 to 86%. Among the insect pests infesting the common beans the whitefly Bemisia tabaci (Genn.) stands out. This species cause direct injury by feeding on the plants and indirect injury by excreting sugary honeydew that is after colonized by the sooty mold. In addition, the most serious damage caused by B. tabaci is the transmission of virus diseases, especially the common bean golden mosaic, responsible for economic losses varying from 30 to 100%. This review aims at providing information on important aspects of B. tabaci including its geographical distribution, bioecology, population dynamics, host plants, and methods of pest control. We expect that this review can provide valuable subsidies for future studies on the whitefly in common beans.

scholarly journals Biotegnologie — ’n Nuwe benadering in planteteling

1991 ◽  
Vol 10 (1) ◽  
pp. 18-25
Author(s):  
D. I. Ferreira
Keyword(s):  
Tissue Culture ◽  
Molecular Biology ◽  
Plant Breeding ◽  
Cell Biology ◽  
Crop Production ◽  
Recombinant Dna ◽  
Global Approach ◽  
Recombinant Dna Technology ◽  
Half Century ◽  
Dna Technology

Conventional plant breeding has made a significant impact on the increase in crop production during the last half century. Several shortcomings however, opened up the opportunities for the application of biotechnology in plant breeding. The vari­ous approaches in the field of cell biology (tissue culture) and molecular biology (recombinant DNA technology) are dis­cussed and the application thereof is advocated in a global approach to plant breeding.

scholarly journals Scientific support to plant breeding and seed production in Siberia in the XXI century

2021 ◽  
Vol 25 (4) ◽  
pp. 448-459
Author(s):  
N. P. Goncharov
Keyword(s):  
Plant Breeding ◽  
Seed Production ◽  
Russian Federation ◽  
Crop Production ◽  
Breeding Strategy ◽  
Agricultural Science ◽  
Agricultural Area ◽  
Natural Soil ◽  
Economic Sector ◽  
The Russian Federation

Agriculture in the Russian Federation is fundamental to the country’s economic performance, living standards, the wellbeing of people and state safety. Considerations relating to food security, prospects of and challenges before plant breeding in the Siberian Federal District (SFD), the largest agricultural area of the Russian Federation, are provided in the article. The agricultural area used in the SFD is about 50 million hectares and accounts for 13 % of the country’s gross grain production. The need for the introduction of modern molecular biological methods, bioengineering and IT technology is demonstrated and discussed. As Russia as a whole, Siberia is largely engaged in unpromising extensive farming practices, which rely on natural soil fertility, and this factor should be taken into account. Another issue is noncompliance with intensive farming technologies used for cultivating new-generation commercial cultivars. Although capital investments in plant breeding are the most cost effective investments in crop production, breeders’ efforts remain underfunded. The article explains the need for fundamental reform in this economic sector: the recognition of plant breeding as being a fundamental science; a fair increase in its funding; the development of a breeding strategy, nationally and regionally; the further expansion of the network of the Breeding Centers; the re-establishment and improvement of the universities’ departments specialized in plant breeding and seed production; having more state-funded places in the universities for training plant breeders to be able to maintain and cement the country’s advanced position in plant breeding and to develop new globally competitive next-generation cultivars of main crops. Should these issues be ignored, all the problems that have accumulated to date will lead to risks of long-term instability in this economic sector. The need for the careful preservation of continuity in plant breeders and plants being bred is stated. The regulatory functions of the state and agricultural science in plant breeding, plant industry and seed production are considered.

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