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Nuclear Changes in European Black Pine Seedlings caused by Growth Regulators

Dražena Papeš ; Hrvatska
Višnja Besendorfer ; Hrvatska
Mirjana Pavlica ; Hrvatska


Puni tekst: engleski pdf 914 Kb

str. 31-36

preuzimanja: 294

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Sažetak

Cytogenetic effects caused by two synthetic auxins: 1-naphtaleneacetic acid (NAA) and indole-3-butyric acid (IBA) as well as by synthetic cytokinin benzyladenine (BA), on root tip cells of ten-day-old European black pine (Pinus nigra Arn.) seedlings were observed. The results showed that auxins induced stronger cytogenetic effects than cytokinin. After treatment with auxins the mitotic activity and the corresponding number of chromosomal aberrations increased in parallel to the concentrations used. Both auxins, NAA and IBA, induced almost the same types of nuclear changes such as spindle failure, chromosome fragmentation, laggards and polyploidy. NAA induced a higher frequency of chromosomal changes than IBA. Also, the recovery period after the application of NAA was much slower as compared to that of IBA. Cytokinin BA showed the opposite effect. After treatment with the highest concentration the mitotic activity was very similar to the control, but after the recovery period the mitotic index increased significantly. This was also the case with a number of aberrant cells.

Ključne riječi

Hrčak ID:

159705

URI

https://hrcak.srce.hr/159705

Datum izdavanja:

31.12.1991.

Podaci na drugim jezicima: hrvatski

Posjeta: 806 *