Abstract
Spindle positioning, meiotic nonreduction, and polyploidy in plants.
Highlights
Polyploidy, the state of having more than two sets of chromosomes, is common in flowering plants, including the major crops [1]
The occurrence of parallel spindles at meiosis II, resulting in a single plane of cell division and formation of dyad spores, is a frequently found mechanism for 2n gamete formation and is genetically equivalent to FDR in that it results in retention of heterozygosity for centromeric markers (Figure 1)
Subsequent analysis showed that T-DNA insertions in AtPS1 result in the production of diploid pollen, and triploidy in as many as 30% of progeny
Summary
Polyploidy, the state of having more than two sets of chromosomes, is common in flowering plants (angiosperms), including the major crops [1]. While polyploids can originate by an increase of chromosome number either during somatic growth or during meiosis, the major route is considered to be via the formation of unreduced gametes [7]. The formation of 2n gametes resulting from failure of reduction during meiosis occurs in several plant species and can give rise to triploids that can serve as a bridge to the establishment of an even set of chromosomes in subsequent generations [8].
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