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From Mediterranean coasts to Tatra Mountains and beyond: Plant chromosome number variation

Date:
November 27, 2012
Source:
Pensoft Publishers
Summary:
It is well known that plants show huge variation in chromosome numbers, mainly because of multiple genome copies. One of the most intriguing issues in botany is to clarify the geographical pattern linked to this variation. In the research, the hypothesis that mean chromosome number in vascular plants increases at increasing latitude was tested.

Chromosome number is the most basic feature concerning the genome of a species, and it is known for about one third of higher plant species. In particular, for plants of Italy, Slovakia, and Poland, online chromosome number databases have been developed: 'Chrobase.it -- Chromosome numbers for the Italian flora', 'Karyological database of ferns and flowering plants of Slovakia' and 'Chromosome number database -- PLANTS', respectively. The three datasets account for about 35%, 60% and 40% of the whole floras, respectively.

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"We used these datasets to compare chromosome number variation among plants of the three countries, with the aim to verify whether the patterns of chromosome number variation parallel the differences in latitudinal ranges" said Dr Peruzzi, leading author of the article, published in the open access journal Comparative Cytogenetics.

A concept that the occurrence of multiple genome copies (polyploidy) in plants tend to increase with latitude had already been formed in the second half of twentieth century, but pioneer works in this field had not significant statistical coverage, due to the absence of large, readily accessible datasets.

In the study, significant differences among the three countries were evidenced, confirming that mean chromosome number increases with increasing latitude. Mean chromosome number was used as an objective proxy of polyploidy.

In perspective, it would be interesting to verify whether the same chromosome number evolution dynamics occurs in the Austral hemisphere as well. Unfortunately, as far as we are aware, large chromosome number databases of these territories with significant latitudinal variations are not available, at the moment.


Story Source:

The above story is based on materials provided by Pensoft Publishers. Note: Materials may be edited for content and length.


Journal Reference:

  1. Lorenzo Peruzzi, Grzegorz Gσralski, Andrzej Joachimiak, Gianni Bedini. Does actually mean chromosome number increase with latitude in vascular plants? An answer from the comparison of Italian, Slovak and Polish floras. Comparative Cytogenetics, 2012; 6 (4): 371 DOI: 10.3897/CompCytogen.v6i4.3955

Cite This Page:

Pensoft Publishers. "From Mediterranean coasts to Tatra Mountains and beyond: Plant chromosome number variation." ScienceDaily. ScienceDaily, 27 November 2012. <www.sciencedaily.com/releases/2012/11/121127111344.htm>.
Pensoft Publishers. (2012, November 27). From Mediterranean coasts to Tatra Mountains and beyond: Plant chromosome number variation. ScienceDaily. Retrieved December 22, 2014 from www.sciencedaily.com/releases/2012/11/121127111344.htm
Pensoft Publishers. "From Mediterranean coasts to Tatra Mountains and beyond: Plant chromosome number variation." ScienceDaily. www.sciencedaily.com/releases/2012/11/121127111344.htm (accessed December 22, 2014).

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