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Description of Amazonian Theobroma L. Collections, Species Identification, and Characterization of Interspecific Hybrids

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Description of Amazonian Theobroma L. Collections, Species Identification, and Characterization of Interspecific Hybrids Acta bot. bras. 18(2): 333-341. 2004 Description of Amazonian Theobroma L. collections, species identification, and characterization of interspecific hybrids Carlos Rogério Sousa Silva1, Giorgini Augusto Venturieri2 and Antonio Figueira1 Received: September 07, 2002. Accepted: September 24, 2003 RESUMO – (Descrição de coleções Amazônicas de Theobroma L., identificação de espécies e caracterização de híbridos inter-específicos). No Estado do Pará, Brasil, localizadas nas cidades de Belém e Marituba, existem duas coleções in vivo de espécies brasileiras do gênero Theobroma L. que abrigam, além das espécies naturais, híbridos inter-específicos obtidos natural ou artificialmente. Objetivando organizar uma base de dados sobre as espécies brasileiras do gênero Theobroma, descreve-se neste artigo as coleções existentes, com informação detalhada sobre os híbridos inter-específicos. Inclui-se chave artificial para identificação dos táxons verificados. Palavras-chave: híbridos inter-específicos, Theobroma, germoplasma, Herrania ABSTRACT – (Description of Amazonian Theobroma L. collections, species identification, and characterization of interspecific hybrids). There are two major in vivo collections of species of the genus Theobroma L. in Belém and Marituba, state of Pará, Brazil, and in both there are natural species, as well as natural and artificial interspecific hybrids. In order to organize a database of Brazilian Theobroma species, a description of the existing collections and detailed information about the interspecific hybrids, including an artificial key for their identification, are presented in this article. Key words: interspecific hybrids, Theobroma, germplasm, Herrania Introduction Cuatr., T. obovatum Klotzsch ex Bernoulli, T. simiarum Donn. Smith., T. sinuosum Pavón ex Hubber, Theobroma L. is the genus of the most relevance T. stipulatum Cuatr., T. subincanum Mart.); Oreanthes of the family Sterculiaceae, because of the economic (T. bernouillii Pittier, T. glaucum Karst., T. speciosum importance of the cacao tree (T. cacao L.) (Purseglove Willd., T. sylvestre Mart., T. velutinum Benoist); 1968). Theobroma is of exclusive neotropical origin, Rhytidocarpus (T. bicolor Humb. & Bonpl.); with natural dispersion in tropical lowland rainforests Telmatocarpus (T. gileri Cuatr., T. microcarpum extending from the Amazon basin through Southern Mart.) and Theobroma (T. cacao L.). Representative Mexico (18ºN to 15ºS) (Cuatrecasas 1964). Recent species from all the sections can be found in Brazil, phylogenetic studies, based on combined analysis of except for Andropetalum. The species that occur in plastid atpB and rbcL DNA sequences, morphological, Brazil are: T. grandiflorum, T. obovatum, anatomical, palynological, and chemical characteristics T. subincanum, T. speciosum, T. sylvestre, have been used to propose the inclusion of the family T. microcarpum, T. glaucum, T. canumanense, Sterculiaceae into a broadly defined Malvaceae sensu T. bicolor, and T. cacao, all restricted to the Amazon latu (Judd & Manchester 1997; Alverson et al. 1999; basin (Cuatrecasas 1964). The existence of the species Bayer et al. 1999). T. canumanense is based in the description of two The genus Theobroma contains 22 species classified exsiccates collected near the river Canumão into six sections: Andropetalum (T. mammosum Cuatr. (municipality of Borba, AM). Seeds of Theobroma are & León); Glossopetalum (T. angustifolium Moçiño & recalcitrant, restricting conventional ex situ preservation Sessé, T. canumanense Pires & Fróes, T. chocoense of genetic resources. Therefore, long-term preservation Cuatr., T. cirmolinae Cuatr., T. grandiflorum (Willd. of Theobroma species requires the establishment of ex Spreng.) Schum., T. hylaeum Cuatr., T. nemorale germplasm collection either in situ or ex situ. 1 Laboratório de Melhoramento de Plantas, Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Av. Centenário, 303, C. Postal 96, CEP 13400-970, Piracicaba, São Paulo, SP, Brazil 2 UFSC/CCB-BEG, Universidade Federal de Santa Catarina, Campus de Trindade, CEP 88040-900, Florianópolis, SC, Brazil 3 Corresponding Author: [email protected] 334 Silva, Venturieri & Figueira: Description of Amazonian Theobroma collections, species identification... Interspecific hybridization between Theobroma generating a list of specimens (species and interspecific species is a potential strategy for cacao (T. cacao) hybrids) properly identified by botanical characters and breeding, including the introduction of genes for by molecular and biochemical markers (Silva 2000; resistance against major pathogens, such as the Silva et al. 2001). All specimens were identified and witches’ broom disease caused by Crinipellis physically mapped in the areas. perniciosa (Stahel) Singer, and other traits, such as “Basil George David Bartley” Collection - A field survey abscission of mature fruits and changes in tree canopy was conducted to correctly identify all species architecture. The development of new biotechnologies represented at ERJOH-CEPLAC, with special might facilitate the generation of new interspecific attention in identifying natural hybrids. Based on an hybrids, increasing the importance of Theobroma existing map, the identification of all existing specimens germplasm collections for their potential use in T. cacao was checked, and a field map was established. The breeding programs. identification of the species, with the establishment of There are two important collections of Theobroma a list of species and hybrids and location on a field species in the state of Pará. The “George O’Neill map, followed the same methods used for the “George Addison” collection at “Empresa Brasileira de O’Neill Addison” collection. Pesquisas Agropecuária Amazônia Oriental/ EMBRAPA Amazônia Oriental” in Belém, and the “George O’Neill Addison” Collection - Initially, the “Basil George David Bartley “ collection, established original field map was searched in the library of at the “Estação de Recursos Genéticos do Cacau “EMBRAPA Amazônia Oriental”, followed by (ERJOH)”, at the “Comissão Executiva do Plano da interviewing many researchers who might had been Lavoura Cacaueira” (CEPLAC), in Marituba, that involved with the collection, without success. A new contains natural and artificial interspecific hybrids map was drawn based on the field survey of the between Brazilian Theobroma species. Nevertheless, collection, checking with existing information from most of the information about these collections have reports and fragments of information from persons not been neither organized nor published. Unfortunately, directly or indirectly involved on the establishment and/ some of the information has been completely lost, such or maintenance of the collection. The map was drawn as the original field map and the notebook of the dividing the area into lines and columns, naming and “George O’Neill Addison” collection. Recently, this locating each plant into Cartesian coordinates. collection has been reinventoried by Silva & Venturieri Identification of species and interspecific hybrids - (1998). Botanical vouchers of Theobroma and Herrania Due to the importance of these two collections, species deposited at the herbarium of “EMBRAPA they were subjected to the following procedures: a) Amazônia Oriental” and from the “Museu Paraense redefinition of the collection boundaries, with a Emílio Goeldi” were consulted to proceed survey of existing specimens and localization in field morphological comparative studies of the Theobroma, maps; b) correct botanical identification of the the interspecific hybrids, and Herrania species. species and their hybrids; and c) formulation of a Descriptions available in the literature were also used descriptive synopsis about the species and their during identifications. hybrids, based on morphological descriptors found in the literature, field observations, and comparison with herbarium samples from “EMBRAPA Results Amazônia Oriental” and from the “Museu Paraense Survey of the in vivo collections Emílio Goeldi”. A review about reported interspecific hybrids of Theobroma and Herrania Goudot, and “Basil George David Bartley” collection a critical survey of available information were also presented to organize and establish a consulting Location - This collection is located at the Eastern source about Theobroma. quarter, near the entrance of the “Estação de Recursos Genéticos do Cacau José Haroldo” (ERJOH), at the road BR 316, Km 15, in Marituba, Pará, Brazil (1º12’S; Material and methods 49º13’W). Survey of the in vivo collections - The Amazonian History - To increase the genetic basis of the species Theobroma collections were re-characterized, related to T. cacao for conservation and future use in Acta bot. bras. 18(2): 333-341. 2004 335 breeding programs, a field collection was started in T. subincanum might be occurring in the area, January/1984 by Dr. Basil George David Bartley with especially those assumed as T. grandiflorum in row representatives of all species of the genus Theobroma F11. naturally occurring in the Brazilian Amazon, including some species of the genus Herrania [H. mariae “George O’Neill Addison” collection (Mart.) Decaisne ex Goudot, H. albiflora Goudot and Herrania sp.]. A summary about this collection was Location - This collection belongs to the “Empresa published (Almeida et al. 1987; 1995). This collection, Brasileira de Pesquisa Agropecuária, EMBRAPA named “Basil George David Bartley Collection” Amazônia Oriental”, located in Belém, Pará,
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