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Characterization of morphological variation and cold resistance in interspecific somatic hybrids between potato solanum tuberosum l. and solanum brevidens phil



Characterization of morphological variation and cold resistance in interspecific somatic hybrids between potato solanum tuberosum l. and solanum brevidens phil



Euphytica 57(1): 37-50



Somatic hybrids between Solanum tuberosum L. cv. Gracia (2n = 4x = 48) and Solanum brevidens Phil. (2n = 2x = 24) were produced via fusion of mesophyll protoplasts. Selection of the protoplast derived putative hybrid calli was based on their vigorous growth. Additive isozyme patterns and chromosome numbers as well as the expression of parental morphological characters have proved the hybrid origin of the selected regenerants. Extensive chromosome loss during the regeneration process resulted in aneuploid hybrids with high frequency. Genomic instability could not be detected in these plants during the period of vegetative propagation. Regenerants from hybrid tissues exhibited wide morphological variation especially in tuber formation. The detailed morphological analysis based on the use of mutlivariate method (principal component analysis, PCA) enabled to identify morphological groups among the hybrid clones. The positoning of hybrid clones in the PCA space could not be correlated with chromosome numbers. The genomic ratio represented by the tetraploid and diploid parents influenced the morphology of somatic hybrid population according to the applied analytical system. Two selected hybrid clones have exhibited an intermediate degree of frost tolerance compared to the parents, based on the recovery of plants from lower buds after freezing of potted plants.

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Accession: 007102416

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