Abstract
Aneuploids have been identified cytomorphologically in progenies from triploid and diploid-triploid crosses. 30 trisomics, 2 double trisomics, 1 tetrasomic, and 2 higher aneuploids were obtained. Some of the aneuploids were found to be different from those reported earlier and higher aneuploids carried eight extra chromosomes. The plants with one extra chromosome occurred more frequently (67%) than the other aneuploid types.
The changes in morphological traits such as a reduction in the amount of growth and the size of leaf etc. distinguished aneuploids from diploids. In the higher aneuploids the plant parts were highly exaggerated and pollen sterility was very high. The chromosomal counts in acetocarmine squashes confirmed the presence of extra chromosome(s). Aneuploids particularly trisomics were found to be promising and may lead to the production of commercially viable plants.
Abstract
Cytomorfologickým zjišjováním aneuploidů v potomstvu triploidů a z křížení triploidů a diploidů bylo získáno 30 trisomických rostlin, 2 dvojnásobní trisomici, 2 tetrasomici a 2 vyšší aneuploidi s 8 extrachromosony. Rostliny s jedním extrachromosomem se vyskytovaly častěji (67%) než ostatní aneuploidní typy.
U aneoploidnich rostlin dochází ke změnám morfologických znaků, redukcí růstu a velikostí listů atd. se liší od diploidů. U vyšších aneuploidů s 8 extrachromosomy byly naopak rostliny i listy větší a pylová sterilita byla velmi vysoká. Acetokarmínové roztlaky potvrdily přítomnost extrachromosomů. Aneuploidů—zvláště trisomiků—může být využito k produkci komerčně důležitých rostlin.
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Mohammed, S. Aneuploidy in guava. Biol Plant 16, 382–388 (1974). https://doi.org/10.1007/BF02921004
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DOI: https://doi.org/10.1007/BF02921004