![]() In principle, the set of traits must be as extensive as possible and drawn from various different organs of the plant. In order to overcome these problems, morphological traits must fulfil certain requirements in order to be adequate for characterization (Perrier, 1998 Gonz ́lez-Andr ́s, 2001). Chief among them are the polygenic inheritance of morphological features, their generally unknown hereditability (Perrier, 1998) and the influence of domestication on some of the morphological and agronomical parameters, which is a generalized phenomenon in cultivated species (Casas et al., 1999). When used for assessing variability, they may lead to systematic errors. Morphological features have well-known problems for germplasm characterization. In spite of the increasing interest in biochemical and molecular techniques for characterizing and identifying cultivars (Christie, 2001), it remains crucial to have adequate morphological traits.
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