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Registros recuperados: 22
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ADOPTION OF MAIZE AND WHEAT TECHNOLOGIES IN EASTERN AFRICA: A SYNTHESIS OF THE FINDINGS OF 22 CASE STUDIES AgEcon
Doss, Cheryl R.; Mwangi, Wilfred; Verkuijl, Hugo; De Groote, Hugo.
This paper synthesizes the findings of 22 micro-level studies on technology adoption carried out by the International Maize and Wheat Improvement Center (CIMMYT) with national agricultural research systems in Ethiopia, Kenya, Tanzania, and Uganda from 1996-1999. The authors found that technology adoption is taking place across Eastern Africa but considerable scope remains to improve the productivity of smallholder agriculture in higher potential regions with high levels of adoption. Extension was the variable most highly correlated with technology adoption, and extension services continue to play an important role in disseminating information on new varieties and how to manage them. Despite the usefulness of the micro-study results, especially for priority...
Tipo: Working or Discussion Paper Palavras-chave: Maize; Wheat; Innovation adoption; Technology transfer; Plant Breeding; Small farms; Case studies; Fertilizers; Private sector; Nongovernmental organizations; Research institutions; International organizations; Kenya; Tanzania; Uganda; Farm Management.
Ano: 2003 URL: http://purl.umn.edu/46522
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Analysing genetic control of cooked grain traits and gelatinization temperature in a double haploid population of rice by quantitative trait loci mapping Eprints@IARI
Govindaraj, P.; Vinod, K K; Arumugachamy, S; Maheswaran, M.
Cooking quality in rice grains is a complex trait which requires improvement. Earlier reports show varying genetic influence on these traits, except for a common agreement on waxy (Wx) and alkali degeneration (Alk) loci on chromosome 6. The present study involved 86 doubled haploid lines derived from an indica × japonica cross involving IR64 and Azucena. Grain parameters viz., raw grain length (RGL), raw grain breadth (RGB), cooked grain length (CGL), cooked grain breadth (CGB), gelatinization temperature (GT), grain shape (RGS), length elongation ratio (LER) and breadth expansion ratio (BER) were subjected to mixed model mapping of quantitative trait loci (QTL). Segregation data of 175 markers covering a distance of 2395.5 cM spanning the entire genome...
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2009 URL: http://eprints.iari.res.in/148/1/fulltext(2).pdf
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Analysis of variability parameters for yield and its components in F3 generation of Safflower (Carthamus tinctorius L.) Eprints@IARI
M, Vijaya Sai Reddy; Pooran, Chand; Bontha, vidyadhar; I, Swarnalatha Devi.
Assessment of genetic variability is an important aspect in the determination of the speed and precision of improvement programme in a perticular crop. In general, a population with high variability provides great oppertunity for crop improvement. The potency of a character for effective selection can be judged rationally through combined assessment of heritablity and genetic advance.Therefore, the present study was aimed to study the genetic variability in an early segregating generation of safflower.
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2003 URL: http://eprints.iari.res.in/259/1/MVReddy%2C_Pooran%2C_BV_Dhar_and_ISD_2_-_2003_(2).pdf
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Correlation and path coefficient analysis of various components on seed yield in F3 generation of Sunflower (Carthamus tinctorius L.) Eprints@IARI
M, Vijaya Sai Reddy; Pooran, Chand; I, Swarnalatha Devi; Bontha, vidyadhar.
The characters viz., number of seeds per capitulum,number of capitula per plant,and test weight had the maximum direct effect on yield. Hence,it is suggested to give more emphasis on these charaters while exercising section for yield improving in Safflower.
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2003 URL: http://eprints.iari.res.in/258/1/MVReddy%2C_Pooran%2C__ISD_and_BV_Dhar_1_-_2003_(2).pdf
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Effect of cytoplasmic male sterility (CMS) on panicle exsertion and sheath rot (ShR) incidence in F2 rice hybrids Eprints@IARI
Vinod, K K; Vivekanandan, P; Subramanian, M.
Sheath rot (ShR) incidents segregated with spikelet fertility
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 1990 URL: http://eprints.iari.res.in/152/1/IRRN15%5B1%5D.pdf
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Estimation of genetic parameters for yield and its component in F4 generation of Safflower (Carthamus tinctorius L.) Eprints@IARI
M, Vijaya Sai Reddy; Pooran, Chand; Bontha, vidyadhar; I, Swarnalatha Devi.
The analysis of genetic parameters of 25 cross progenies of safflower revealed high estimates of genotypic coefficient variation and phenotypic coefficient variation for seed yield per plant. Number of seeds per capitulum, number of secondary branches,number of primary branches, test weight and seed yield per plant indicating that simple selection could be effective for improving seed yield and its attributes.
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2004 URL: http://eprints.iari.res.in/260/1/MVReddy%2C_Pooran%2C_BV_Dhar_and_ISD_3_-_2003_(2).pdf
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Evaluation of germplasm for genetic diversity in Pearl millet (Pennisetum glaucum (L.)R.Br.) Eprints@IARI
Bontha, Vidyadhar; I, Swarnalatha Devi.
The hybridization among genetically deverse parental genotypes for specific traits may be useful in bringing the new gene pool in the population and expanding the range of adaptibility.
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2007 URL: http://eprints.iari.res.in/250/1/BV_Dhar_and_ISD_1_-_2007.pdf
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Fases de desenvolvimento da planta de girassol. Infoteca-e
CASTIGLIONI, V.B.R.; BALLA, A.; CASTRO, C. de; SILVEIRA, J.M..
Caracteristicas basicas da planta de girassol; Descricao das fases de desenvolvimento da planta de girassol; Duracao e existencias das principais fases de desenvolvimento da planta de girassol; Avaliacao de caracteres agronomicos em girassol.
Tipo: Documentos (INFOTECA-E) Palavras-chave: Girassol; Melhoramento; Avaliacao; Caracteristica; Desenvolvimento; Fase; Estadio; Brasil; Sunflower; Plant Breeding; Evaluation; Characteristics; Development; Stage; Brazil.
Ano: 1994 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/445797
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Genetic effects for controlling stripe rust (Puccinia striiformis f. sp. tritici) resistance in wheat through joint segregation analysis Agronomy
Ullah, Kalim; Khan, Naqib Ullah; Gul, Rozina; Gul, Samrin; Khan, Mohammad Irfaq; Khan, Imdad Ullah.
Mixed inheritance analysis using joint segregation analysis (JSA) for stripe rust (Puccinia striiformis f. sp. tritici) resistance was carried out in six basic populations (P1, F1, P2, BC1, BC2 and F2) of four wheat crosses (Hashim-08 × LU-26, Farid-06 × Shafaq, Parula × Blue Silver, TD-1 × D-97603) during crop season 2009 to 2012. Genes controlling stripe rust resistance were assessed by using area under disease progress curve (AUDPC). The AUDPC was controlled by mixed two additive-dominant-epistatic major genes plus additive-dominant-epistasis of polygenes in cross Hashim-08 × LU-26 (model E), while in Farid-06 × Shafaq, it was controlled by mixed two major additive-dominant genes plus additive-dominant polygenes (model E-2). In cross Parula × Blue...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Quantitative Genetics; Wheat Breeding; Disease resistance area under disease progress curve (AUDPC); Major gene and polygene inheritance; Segregating populations; Stripe rust (Puccinia striiformis f. sp. tritici); Triticum aestivum L. Genetics; Plant Breeding; Genotypic disease resistance.
Ano: 2016 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/28347
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GENETIC VARIABILITY AND CHARACTER ASSOCIATION IN PEARL MILLET (Pennisetum glaucum (L.) R. Br.) AND THEIR IMPLICATIONS IN SELECTION Eprints@IARI
Bontha, Vidyadhar; Pooran Chand, Pooran Chand; I Swarnalatha Devi, I Swarnalatha Devi; M Vijaya Sai Reddy, M Vijaya Sai Reddy; D Ramachandraiah, D Ramachandraiah.
To assess the genetic variability and character association among the fourteen advanced hybrids of pearl millet have been studied for twelve quantitative traits. Significant differences were observed for all the characters, indicating the diverse genetic nature of the hybrids under study. High PCV and GCV for grain yield, tiller number, fodder yield and number of leaves indicates the possibilities of improving these characters through phenotypic selection for the development of dual-purpose hybrids in pearl millet. High heritability coupled with high genetic advance as percentage of mean was observed for days to flowering, grain yield, plant height, fodder yield, tiller number, days to maturity and leaf length suggesting that these traits are governed by...
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2010 URL: http://eprints.iari.res.in/238/1/genetic_variability.doc
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Genetic variability and character association of yield attributes in Peral millet (Pennisetum glaucum (L.) R.Br.)germplasm Eprints@IARI
Bontha, vidyadhar; Pooran, Chand; I, Swarnalatha Devi.
Estimate the heritable variation of yield components in the germplasm lines of Pearl millet.
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2006 URL: http://eprints.iari.res.in/254/1/BV_Dhar%2C_Pooran_and_ISD_2006.pdf
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Interspecific Hybrids of Wild x Cultivated Triticum Crosses - A Study on the Cytological Behaviour and Molecular Relations Eprints@IARI
Bhagyalakshmi, Kari; Vinod, K K; Kumar, M; Arumugachamy, S; Prabhakaran, A J; Raveendran, T S.
Genetic diversity of the cultivated wheat is narrowing down and is increasingly becoming non-complacent in tackling new pathogenic races and adverse environmental situations. Wild relatives of wheat are rich repositories of beneficial genes that are capable of defying adverse situations. However, these wild species are not readily crossable with cultivated ones. The present study attempted crossing three wild wheat species as females with three cultivated species of varying ploidy to understand the intricate behaviour of hybrids in relation to cytology, morphology and molecular recombination. Post-fertilisation barriers caused hybrid recovery in wild species in contrast to cultivated species. Triticum monococcum did not produce hybrids in any of the...
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2008 URL: http://eprints.iari.res.in/150/1/Bhagyalakshmi_etal_2008.pdf
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Line × Tester analysis for heavy seeds in chickpea Eprints@IARI
Gomathinayagam, P; Nagarajan, P; Vinod, K K; Rathnaswamy, R.
To know the Combining ability of seed weight in chickpea, five lines namely CO1, CO2. CoG4, GoG6 and ICCV2 as females and three testers namely Annigeri, CO3 and L 550 as males were crossed in a line x tester model. The effects of the parents and the sca effects of the hybrids were estimated. The estimates of gca revealed that significant and positive effects were observed with CoG4 (5.241), CoG6 (1.627) and 1CCV2 (1.775) : among lines and with Annigeri (1.468) among testers. The hybrids COG4 x Annigeri showed high sca effects (2.982); while CoG6 x CO3 (4.028) and ICCV2 x CO3 showed • high sca (1.524) with high per se performance. The gca and sca variance ratio showed the preponderance of non-additive gene action for the seed weight in chickpea (0.1734:1).
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 1993
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Molecular anatomy of seedlessness in grapevine: the role of VvAGL11 during seed morphogenesis. Repositório Alice
MALABARBA, J.; BUFFON, V.; MARIATH, J. E. de A.; DORNELAS, M. C.; PINHEIRO-MARGIS, M. M. A. N.; PASQUALI, G.; REVERS, L. F..
2015
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Cultivar; Uva; Viticultura; Grapevine; Stenospermocarpic seedlessness; Chardonnay; Plant Breeding.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1033202
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Nature of association among some quantitative traits in F4 generation of Safflower (Carthamus tinctorius L.) Eprints@IARI
M, Vijaya Sai Reddy; Pooran, Chand; Bontha, vidyadhar; I, Swarnalatha Devi.
Character association and path coefficients were worked in safflower using 25 hybrids on eight characters. Seed yield was positive and associated with number of secondary branches and number of capitula per plant. Number of seeds per capitulum, followed by number of capitula per plant, number of secondary branches and number of primary branches exhibited the highest positive direct effect on seed yield.
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2004 URL: http://eprints.iari.res.in/261/1/MVReddy%2C_Pooran%2C_BV_Dhar_and_ISD_4_-_2004_(2).pdf
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Pollen–pistil interaction in the inter-specific crosses of Sesamum sp Eprints@IARI
Ram, S Ganesh; Sundaravelpandian, K; Kumar, M; Vinod, K K; Bapu, J R Kannan; Raveendran, T S.
The wild species of Sesamum have long been recognized as an important source of many valuable pest and disease resistance genes and other novel traits such as male sterility and plant type for the cultivated taxon. Utilization of these species in crop improvement is marginal because of their inherent low crossability with the cultigen. An understanding of the biological nature of incompatibility systems that impede hybridization offers tools for successful introgressions into cultivated sesame. The objective of this investigation was to observe pollen germination and pollen tube growth in cross pollinated S. indicum pistils as an indicator of pre-zygotic barriers operating in wide crosses involving S. indicum. Three wild species: S. alatum, S. radiatum and...
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2006 URL: http://eprints.iari.res.in/149/1/fulltext.pdf
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QTL and QTL x environment effects on agronomic and nitrogen acquisition traits in rice. Eprints@IARI
Senthilvel, Senapathy; Vinod, K K; Malarvizhi, Palaniappan; Maheswaran, Marappa.
Agricultural environments deteriorate due to excess nitrogen application. Breeding for low nitrogen responsive genotypes can reduce soil nitrogen input. Rice genotypes respond variably to soil available nitrogen. The present study attempted quantification of genotype x nitrogen level interaction and mapping of quantitative trait loci (QTLs) associated with nitrogen use efficiency (NUE) and other associated agronomic traits. Twelve parameters were observed across a set of 82 double haploid (DH) lines derived from IR64/Azucena. Three nitrogen regimes namely, native (0 kg/ha; no nitrogen applied), optimum (100 kg/ha) and high (200 kg/ha) replicated thrice were the environments. The parents and DH lines were significantly varying for all traits under different...
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2008
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R&D Appropriability and Planned Obsolescence: Empirical Evidence from Wheat Breeding in the UK (1960-1995) AgEcon
Rangnekar, Dwijen.
Plant breeders face a unique appropriation problem - plants are reproducible, genetic information is heritable and seeds can be multiplied. The paper uses indicators of varietal age as a proxy for durability to examine strategies of planned obsolescence. Using wheat breeding in the UK, evidence of strategies of planned obsolescence is confirmed. This is then corroborated with evidence of tendencies towards increased proliferation of varieties on the market and breeding strategies that focus on incremental productivity improvements (i.e. increased efficiency) and narrow and limited disease resistance (i.e. reduced durability).
Tipo: Conference Paper or Presentation Palavras-chave: Planned Obsolescence; R&D appropriability; Innovation; Plant Breeding; Crop Production/Industries; L13; O31; Q10.
Ano: 2002 URL: http://purl.umn.edu/24904
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Recurrent mass selection for upright plant architecture in common bean Scientia Agricola
Pires,Luiz Paulo Miranda; Ramalho,Magno Antonio Patto; Abreu,Ângela de Fátima Barbosa; Ferreira,Monica Christina.
Plant with a more upright architecture offers many advantages to farmers. Recurrent mass selection (RS) programs for carioca type common bean have been implemented for the purpose of obtaining new lines that will generate the high yields that are associated with upright plant archi tecture. This study aimed to assess the efficiency of recurrent mass selection (RS) for upright plant architecture in common bean (Phaseolus vulgaris) and the effect of RS on grain yield and to verify whether or not there is still variability in the population that favors continuing selection programs, using information obtained from progenies evaluated in cycle five (CV) and cycle eight (CVIII) of the RS program. Mass selection for more upright plants was performed visually in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant Breeding; Genetic progress; Genetic variability.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300009
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Trait identification and QTL validation for reproductive stage drought resistance in rice using selective genotyping of near flowering RILs Eprints@IARI
Subashri, M; Robin, S; Vinod, K K; Rajeswari, S; Mohanasundaram, K; Raveendran, T S.
Drought resistance is becoming an indispensable character for rice improvement due to the dwindling global water resources. Genetic improvement for drought resistance is achieved through physiological dissection and genetic analysis of independent component traits associated with crop productivity under stress. A subset mapping population of 93 near flowering recombinant inbred lines with uniform phenology was constituted for genetic analysis of reproductive stage drought resistance. The population was phenotyped for 22 physio-morphological traits under two contrasting water regimes imposed at reproductive stage. Broad sense heritabilities of morphological traits were lower under stress than irrigated. Predominant association of plant height, panicle...
Tipo: Article Palavras-chave: Plant Breeding.
Ano: 2009
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