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Ploidy
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Ploidy refers to the number of sets of chromosomes in the nucleus of a cell. In their natural state, most orchids (as well as other plants) have 2 sets of chromosomes (one set from each parent) and are referred to as diploid (2N). Either through chance breeding or conversion in nature, intentional breeding in horticulture or chemical manipulation, other combinations can occur. Of most interest in horticulture are triploid (3N) and tetraploid (4N) states. Polyploid (having more than 2 sets of chromosomes) plants have larger cells and stomata than diploid plants but have a slower growh rate and may have reduced fertility. References: Wikipedia and Breeding of Horticultural Crops: Principles and Practices by N. Kumar |
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