Chiari, Lucimara

Jank, Liana

Resende, M. D. V.

Resende, Rosangela M. S.

Valle, Cacilda B.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Genetic Analysis of Selfed and Open Pollinated Progenies of Stylosanthes capitata Rosangela M. S. Resende EMBRAPA, Brazil M. D. V. Resende EMBRAPA, Brazil Liana Jank EMBRAPA, Brazil Lucimara Chiari EMBRAPA, Brazil Cacilda B. Valle EMBRAPA, Brazil Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/12-1/24 The XXI International Grassland Congress / VIII International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]355　 瞯Grasslands/Rangelands Production Systems——— Developing Improved PlantsGenetic analysis of selfed and open pollinated progenies of Stylosanthes capitataR .M .S . Resende1 , M .D .V . Resende2 , L . Jank1 , L . Chiari1 , C .B . V alle11 Embrapa Bee f Cattle , Caixa Postal 154 , 79002‐970 Campo G rande , MS , Braz il , E‐mail : rosangela＠ cnp gc .embrapa .br ,2 Embrapa Forestry , Caixa Postal 319 , 83411‐000 Colombo , PR , Braz ilKey words : forage legume ,genetic parameters ,mating system ,plant breedingIntroduction Sty losanthes cap itata is the most important forage legume currently used in Brazilian Savannas . Information fromgenetic studies of self pollination ( S１) or open pollination of the species ( OP) are important both for the decision of breedingstrategies as well as the composition of future cultivars .Material and methods １９ progenies S１ and OP were evaluated in a random blocks design , with ６ replications and ６ plants perplot , in Campo Grande , MS , for total dry matter and seed yields . Plants were evaluated on an individual basis . Genetic andphenotypic parameters were obtained using the software Selegen‐Reml/Blup ( Resende , ２００２) . An approximate estimate of therate of selfing ( S) of the species was presented by : （１ ＋ S)２ ＝ ４σ２gOPσ２gS１, in which : σ２gOP ,σ２gS１ : additive genetic variance among OPand S１ progenies , respectively .Results Individual narrow sense heritabilities , for the evaluated characteristics in S . cap itata OP and S１ progenies , were ofmoderate magnitude ( Table １) . The estimated genetic correlation between total dry matter and seed yields in OP progenies was０ .８４ and in S１ progenies ０ .７１ . The magnitude of the genetic variation coefficient indicates the possibility of obtaining gainswith selection in future breeding generations . A mean selfing rate of ４９％ was estimated for the characteristics evaluated in S .cap itata , which shows , therefore , that the species has a mixed reproductive system .Based on this evidence , selection based onan index combining the OP and S１ progeny information was proposed . This index has as objectives the improvement of thepopulation with a simultaneous decrease in endogamic depression and was used in S . cap itata considering the selected progeniesfor each type‐OP or S１‐and also the index combining both progenies . The results are presented in Table ２ , for both evaluatedcharacteristics .Table 1 Estimated genetic parameters in Sty losanthescap itata f or p rogenies o f open pollination (OP) and o f asel f pollination generation ( S1 ) f or the characteristicstotal dry matter ( TDM , g / p lant ) and seed yields ( g /p lant) .Parameter TDM SeedOP S１ .OP S１ 貂Va ８８４  .４２ １４４０ .６５ ８ 亮.７８ １７ �.４４Vp ２３０４ $.６２ ５７４ �.２６ ９ 亮.２８ ０ 棗.７１Ve ３２３７ $.６４ ７８２６  .９２ ３１ 刎.６３ ７１ �.９６Vf ６４２６ $.６９ ９４８１  .８３ ４９ 刎.６８ ９０ �.１１h２a ０ 北.１３７６ ０ ⅱ.１４６４ ０ 摀.１７６６ ０ i.１９３６h２aj ０ 北.２１４６ ０ ⅱ.１５５５ ０ 摀.２１７２ ０ i.１９５１Accuracy ０ 哌.７８ ０ 行.９１ ０ 亮.８６ ０ 棗.９４Cvgi ( ％ ) １８ 鲻.４６ ２１ 珑.１８ ２６ 刎.０５ ３４ �.２５μ １６１ 哌.０７５８ １７９ 行.１６７８ １１ *.３７０４ １２ �.１９５６Va : Genetic variance among families ; Vp : Environmental variance amongplots ; Ve : Residual variance ; Vf : Phenotypic variance ; h２a : Individualheritability ; h２aj : Adjusted heritabiltiy ; Cvgi : Coefficient of genetic variance ;μ : Overall mean .Table 2 Order o f the p rogenies o f open pollination (OP)and sel f pollination generation ( S1) , as well as based onan index combining in f ormation o f both p rogenies , f or thecharacteristics o f total dry matter ( TDM ) and seed yields .Order TDM Index Seed IndexOP S１  OP S１ 8１ d７７ 技７２  ７２ y７４ 鬃６６ 6６６ {２ d７４ 技７７  ６６ y７７ 鬃７２ 6７２ {３ d７９ 技６６  ７５ y７９ 鬃７６ 6７６ {４ d７２ 技７９  ７６ y７２ 鬃７４ 6７５ {５ d６４ 技６４  ６４ y６６ 鬃６５ 6６５ {６ d７０ 技７６  ７７ y７０ 鬃７０ 6７０ {７ d７６ 技７４  ７０ y６５ 鬃７５ 6６４ {８ d６５ 技７０  ７９ y６４ 鬃７７ 6７７ {９ d６６ 技７５  ６５ y７６ 鬃６４ 6６２ {１０ {６１ 技６５  ７４ y７５ 鬃７９ 6７４１１ {７５ 技６１  ６２ y６１ 鬃６２ 6６１１２ {６２ 技６２  ６１ y６２ 鬃６１ 6７９Conclusions From the information obtained and pondering the need for short‐term selection gains , we recommend the pursuit ofsynthetic populations , using the five best progenitors identified by the index combining OP and S１ . By this procedure , thereshould be less inbreeding and the synthetic population should maintain productivity after several generations , which is anadvantage both to the pasture system and to the producer .ReferenceResende , M .D .V . (２００２) . Software Selegen‐Reml/Blup . Colombo : Embrapa Florestas , ２００２b . ６５ p . ( Embrapa Florestas .Documentos , ７７) .

Genetic Analysis of Selfed and Open Pollinated Progenies of \u3ci\u3eStylosanthes capitata\u3c/i\u3e

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3279&amp;context=igc

Genetic Analysis of Selfed and Open Pollinated Progenies of \u3ci\u3eStylosanthes capitata\u3c/i\u3e

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