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Meiotic restitution mechanisms and 2 n pollen formation in a Solanum tuberosum dihaploid and in dihaploid × wild species hybrids *
Author(s) -
Conicella C.,
Genualdo G.,
Errico A.,
Frusciante L.,
Monti L. M.
Publication year - 1996
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1996.tb00893.x
Subject(s) - meiosis , pollen , biology , hybrid , ploidy , prophase , botany , anaphase , microspore , genetics , chromosome , stamen , gene
A Solatium tuberosum dihaploid that proved to be a 2 n pollen producer, exhibited two types of meiotic abnormality involved in 2 n pollen formation: premature cytokinesis at prophase II and parallel/tripolar spindles in meiosis II. For this reason such a dihaploid was preferentially used as a seed parent in crosses with the diploid species S. tarijense, S. sanctae‐rosae , and S. phureja. Diploid interspecific hybrids were evaluated for male fertility, for 2 n pollen production and stability over three years and for meiotic nuclear restitution mechanisms. Pollen stainability ranged from 6 to 85% and 2 n pollen from 5 to 35% among hybrids. The meiotic mechanism generating 2n pollen was that of spindle abnormality in meiosis II and consequent dyad/triad formation. High correlation was found between fused/parallel spindles and dyads.