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Chromosome numbers and pollen stainability of three species of Pacific Island breadfruit ( Artocarpus , Moraceae)
Author(s) -
Ragone Diane
Publication year - 2001
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.2307/2657070
Subject(s) - moraceae , biology , pollen , artocarpus , botany , ploidy , interspecific hybrids , hybrid , chromosome , cultivar , interspecific competition , chromosome number , karyotype , gene , genetics
Chromosome numbers were determined for 48 accessions of breadfruit ( Artocarpus altilis, A. mariannensis , and A. camansi [Moraceae]) from 16 Pacific Island groups, Indonesia, and the Philippines. Artocarpus camansi and A. mariannensis exhibit counts of 2 n = 56; 2 n = 56 (diploidy) and 2 n = 84 (triploidy) were observed for A. altilis . Most diploid cultivars of A. altilis were seeded, but two cultivars with reduced seed number were observed. Micronesian accessions included putative interspecific hybrids between A. altilis and A. mariannensis . The majority of these accessions were seedless diploids, but triploid putative hybrids were also observed. Pollen stainablility was shown to correlate with the degree of seediness.