identification of plantlet genetic origin in polyembryonic mango (mangifera indica, l.) cv. rosinha seeds using rapd markers identificação da origem genética de plântulas em sementes poliembriônicas de mangueira (mangifera indica, l.) cv. rosinha por meio de marcadores rapd

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ID: 158078
2006
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Abstract
Mango can be propagated by seeds or by grafting. For commercial purpose, grafting is the most appropriate method because it maintains the genetic characters from the propagated variety. To obtain grafted mango it is important to use polyembryonic varieties as rootstock since they produce a zygotic and many nucellar plantlets. The nucellar plantlets maintain the genetics of the mother-plant thus, are preferred for grafting since they supposedly give more uniformity to the orchard. In general, nurserymen use the most vigorous plantelet to graft, believing that they are nucellar. But, orchard disuniformities on height and yield are very common among mango trees of commercial orchards in Northeast region. The objective of this paper was to identify the genetical origin of plantlets from polyembryonic seeds of Rosinha variety using Random Amplified Polymorphic DNA (RAPD) markers. Moreover, the position of the zygotic embryo and the percentage of the vigorous zygotic and nucellar plantlets was also determined. It was obtained an elevated taxa of vigorous zygotic plantlets which possibly explains the disuniformity on height of trees at commercial mango orchards.
A mangueira pode ser propagada por sementes ou por enxertia. Para fins comerciais, a propagação por enxertia é a mais apropriada, por manter o padrão genético da cultivar propagada. Na obtenção de mudas enxertadas, é importante o uso de variedades poliembriônicas como porta-enxerto, uma vez que essas produzem uma plântula zigótica e várias nucelares. As plântulas nucelares mantêm as características genéticas da planta-mãe e, por isso, são preferidas na propagação por enxertia por, supostamente, oferecerem maior uniformidade no pomar. Em geral, os viveiristas utilizam a plântula mais vigorosa para enxertar, supondo que o mesmo seja de origem nucelar. Porém, desuniformidades de altura e produção são muito comuns em pomares comerciais de manga na região Nordeste. O objetivo deste trabalho foi identificar a origem genética das plântulas de sementes poliembriônicas da variedade Rosinha, utilizando marcadores RAPD (Random Amplified Polymorphic DNA). Além disso, a posição do embrião zigótico e o percentual de plântulas zigóticas e nucelares vigorosas também foram determinados. Foi observada uma elevada taxa de plântulas zigóticas vigorosas a qual, possivelmente, explica a desuniformidade quanto à altura das plantas nos pomares comerciais de mangueira.
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Authors ;Maria Cristina Rocha Cordeiro;Alberto Carlos Queiróz Pinto;Víctor Hugo Vargas Ramos;Fábio Gelape Faleiro;Lilia Marta Santos Fraga
Journal technocom
Year 2006
DOI
10.1590/S0100-29452006000300025
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452006000300025
Keywords
embryo rootstock orchard uniformityplant culture

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