Identification of plantlet genetic origin in polyembryonic mango (Mangifera indica, L.) cv. Rosinha seeds using RAPD markers.
Cordeiro M. C. R., Pinto A. C. Q., Ramos V. H. V., Faleiro F. G., Fraga L. M. S.
Author Affiliation: Empresa Brasileira de Pesquisa Agropecuária (Embrapa Cerrados), Rod. BR020, km 18, CEP 73310-970, Brazil.
Revista Brasileira de Fruticultura 28 : 454-457
Abstract : Mango can be propagated by seeds or by grafting. For commercial purposes, grafting is the most appropriate method because it maintains the genetic characters of the propagated cultivar. To obtain grafted mango, it is important to use polyembryonic cultivars as rootstocks since they produce 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 plantlet to graft, believing that they are nucellar. But, orchard disuniformities on height and yield are very common among mango trees of commercial orchards in the Northeast region. The genetic origin of plantlets from polyembryonic seeds of mango cv. Rosinha was determined using random amplified polymorphic DNA markers. Moreover, the position of the zygotic embryo and the percentage of the vigorous zygotic and nucellar plantlets was also determined. An increase in the number of vigorous zygotic plantlets was observed to cause the disuniformity on the height of trees in commercial mango orchards.