Part of the Forestry Sciences book series (FOSC, volume 24-26)


Many important agricultural species are polyploids. Polyploidy is less common in forest trees and rare in gymnosperms (12, 52). Among the polyploids, triploids occupy an important position in cultivated plants. However, due to sterility barriers they can only be propagated by vegetative means. Triploids are generally vigorous and the banana is perhaps an outstanding example of a triploid crop. In this species maximum vigor is associated with the triploid state. Moreover, since diploid bananas have hard seeds that make their fruit commercially unacceptable, the sterility that accompanies triploidy has the important commercial advantage of genetically deseeding the banana in an efficient and dependable way. Some poplars are also vigorous in the triploid state. The discovery by Muntzing (34) that certain naturally occurring giant types of European aspen are triploids, prompted others to try artificial production of triploid aspen. The normal practice to produce triploids is to cross tetraploids with diploids. Sometimes the crosses may not be successful and therefore the repeated production of triploid seeds would be difficult. Production of triploid plants via endosperm culture in vitro could be useful to overcome this problem.


Somatic Embryo Somatic Embryogenesis Gibberellic Acid Casein Hydrolysate Coconut Milk 
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© Martinus Nijhoff Publishers, Dordrecht 1987

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