Eventhough a great deal of information has been accumul- ated about the phenomenon of heterosis, we are sill unable to define exactly why a hybrid grows better than the parents from which it comes. The cause may be physiological and the hybrid may function efiectively with increased metabolic efficiency. The specific physiological processes which contribute to the vigour in the hybrid may be numerous and complex rather than single and simple and they may not be the same for all examples of hybrid vigour. The operational descriptions of heterosis have not yet been well presented.
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