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Chromosome numbers for the Italian flora: 7
expand article infoGiovanni Astuti, Lijuan Liu, Lorenzo Peruzzi
‡ Università di Pisa, Pisa, Italy
Open Access

Abstract

In this contribution, new chromosome data obtained on material collected in Italy are presented. It includes a total of 105 chromosome counts for three populations of Pulmonaria vallarsae A.Kern. subsp. apennina (Cristof. & Puppi) Cecchi & Selvi and for three populations of P. hirta L.

Keywords

cytogeography, cytotaxonomy, Pulmonaria hirta complex

How to contribute

Texts concerning new chromosome data should be submitted electronically to Giovanni Astuti (gastuti@biologia.unipi.it), including indications on voucher specimens and methods used.

Chromosome counts

Pulmonaria vallarsae A.Kern. subsp. apennina (Cristof. & Puppi) Cecchi & Selvi (Boraginaceae)

Chromosome number

2n = 22 (Figs 1, 2)

Voucher specimen

ITALY. Emilia-Romagna. Casalecchio di Reno (Bologna), Parco Talon (WGS84: 44.47278N, 10.28416E), 76 m s.l.m., 23 March 2018, G. Astuti et L. Liu (PI n° 021283–021302); Calabria. San Fili (Cosenza), Foresta Luta (WGS84: 39.34085N, 16.08722E), margine di bosco a Fagus sylvatica (più in basso a Tilia platyphyllos e Acer platanoides), 1030 m s.l.m., 5 April 2018, G. Astuti, L. Liu, F. Roma-Marzio (PI n° 021323–021342).

Figure 1. 

Pulmonaria vallarsae A.Kern. subsp. apennina (Cristof. & Puppi) Cecchi & Selvi from Parco Talon (Casalecchio di Reno, Bologna), 2n = 22. Scale bar: 10 μm.

Figure 2. 

Pulmonaria vallarsae A.Kern. subsp. apennina (Cristof. & Puppi) Cecchi & Selvi from Foresta Luta (San Fili, Cosenza), 2n = 22. Scale bar: 10 μm.

Chromosome number

2n = 26 (Fig. 3)

Figure 3. 

Pulmonaria vallarsae A.Kern. subsp. apennina (Cristof. & Puppi) Cecchi & Selvi from Rocca di Mezzo (L’Aquila), 2n = 26. Scale bar: 10 μm.

Voucher specimen

ITALY. Abruzzo. Rocca di Mezzo (L’Aquila), in Via dei Prati Santi (WGS84: 42.2125N, 13.51305E), lungo il fossato insieme a Salix apennina, 1289 m s.l.m., 10 April 2018, G. Astuti, L. Liu, F. Bartolucci (PI n° 021303–021322).

Method

Squash preparations were made on root-tips obtained from potted plants. Root tips were pre-treated with 0.4% colchicine for 3 hours and then fixed in Carnoy fixative solution for 1 hour. After hydrolysis in HCl 1N at 60 °C, the tips were stained in leuco-basic fuchsine.

Observations

Puppi and Cristofolini (1996) collected the holotype of the name P. apennina from Parco Talon (Emilia-Romagna). All the 18 plants sampled from this population show the typical chromosome number of P. apennina, i.e. 2n = 22, without any variation. Also the chromosome number found in 18 individuals from Foresta Luta (Calabria) is 2n = 22, and it agrees with a single previous count (Peruzzi and Cesca 2003) available from that area. On the contrary, all the 17 individuals sampled from Rocca di Mezzo (Abruzzo) show 2n = 26 chromosomes. The identification of these plants was based on morphological features, revised by L. Cecchi on herbarium sheets preserved at APP (F. Bartolucci in verbis). Previously, chromosome numbers (2n = 25, 26) intermediate between 2n = 22, typical of P. apennina, and 2n = 28, typical of P. hirta (Cecchi and Selvi 2015), were reported from populations in northern and central Apennines (Puppi and Cristofolini 1996, Vosa and Pistolesi 2004). However, this is the first case in which an intermediate chromosome number is constantly observed within a single population.

G. Astuti, L. Liu, L. Peruzzi

Pulmonaria hirta L. (Boraginaceae)

Chromosome number

2n = 28 (Figs 4, 5, 6)

Voucher specimen

ITALY. Toscana. Poppi (Arezzo), all’Eremo di Camaldoli (WGS84: 43.80902N, 11.82518E), lungo la SP124 nel tratto che porta dall’eremo al Prato alla Penna, al margine della faggeta, 1150 m s.l.m., 24 April 2018, G. Astuti et L. Liu (PI n° 021358–021376); Santa Maria a Monte (Pisa), Valle Lupitana (WGS84: 43.71388N, 10.67218E), nelle schiarite del bosco, 39 m s.l.m., 21 March 2018 G. Astuti et L. Liu (PI n° 021343–021357); Emilia-Romagna. Grizzana Morandi (Bologna), lungo la SP73 presso la località Favari, (WGS84: 44.22385N, 11.09556E), a margine del querceto, 539 m s.l.m., 19 April 2018, G. Astuti et L. Liu (PI n° 021377–021396).

Figure 4. 

Pulmonaria hirta L. from Eremo di Camaldoli (Poppi, Arezzo), 2n = 28. Scale bar: 10 μm.

Figure 5. 

Pulmonaria hirta L. from Valle Lupitana (Santa Maria a Monte, Pisa), 2n = 28. Scale bar: 10 μm.

Method

Squash preparations were made on root-tips obtained from potted plants. Root tips were pre-treated with 0.4% colchicine for 3 hours and then fixed in Carnoy fixative solution for 1 hour. After hydrolysis in HCl 1N at 60 °C, the tips were stained in leuco-basic fuchsine.

Observations

A specimen collected in Camaldoli (Toscana) was selected as the epitype for the name P. hirta by Selvi in Cafferty and Jarvis (2004). We found 2n = 28 chromosomes, the chromosome number typical of this species (Cecchi and Selvi 2015), and no variation among the 16 individuals sampled in this topotypical population. A specimen coming from Valle Lupitana (Toscana) was selected by Puppi and Cristofolini (1996) as the neotype for the name Pulmonaria picta Rouy, a heterotypic syonym of P. hirta. Also for the 18 individuals sampled in this population, we found 2n = 28 chromosomes, in agreement with other counts from the same geographical area (Vosa and Pistolesi 2004). The identification of the population from Favari (Emilia-Romagna) was based on morphological features of basal leaves, and the 18 individuals sampled, all showing 2n = 28 chromosomes, confirmed our identification.

G. Astuti, L. Liu, L. Peruzzi

Figure 6. 

Pulmonaria hirta L. from Favari (Grizzana Morandi, Bologna), 2n = 28. Scale bar: 10 μm.

Acknowledgements

The authors are deeply grateful to Fabrizio Bartolucci, Giancarlo Marconi, Francesco Roma-Marzio and Paolo Pupillo for their help during field activities.

References

  • Peruzzi L, Cesca G (2003) Numeri Cromosomici per la Flora Italiana 1421–1433. Informatore Botanico Italiano 35(1): 85–91.