Annual cambial rhythm in Pinus halepensis and Pinus sylvestris as indicator for climate adaptation
To understand better the adaptation strategies of intra-annual radial growth in Pinus halepensis and Pinus sylvestris to local environmental conditions, we examined the seasonal rhythm of cambial activity and cell differentiation at tissue and cellular levels. Two contrasting sites differing in temperature and amount of precipitation were selected for each species, one typical for their growth and the other represented border climatic conditions, where the two species coexisted. Mature P. halepensis trees from Mediterranean (Spain) and sub-Mediterranean (Slovenia) sites, and P. sylvestris from sub-Mediterranean (Slovenia) and temperate (Slovenia) sites were selected. Repeated sampling was performed throughout the year and samples were prepared for examination with light and transmission electron microscopes. We hypothesized that cambial rhythm in trees growing at the sub-Mediterranean site where the two species co-exist will be similar as at typical sites for their growth. Cambium in P. halepensis at the Mediterranean site was active throughout the year and was never truly dormant, whereas at the sub-Mediterranean site it appeared to be dormant during the winter months. In contrast, cambium in P. sylvestris was clearly dormant at both sub-Mediterranean and temperate sites, although the dormant period seemed to be significantly longer at the temperate site. Thus, the hypothesis was only partly confirmed. Different cambial and cell differentiation rhythms of the two species at the site where both species co-exist and typical sites for their growth indicate their high but different adaptation strategies in terms of adjustment of radial growth to environmental heterogeneity, crucial for long-term tree performance and survival.
2016
2017-07-12 09:14:51
1033
Aleppo pine, Pinus halepensis, Scots pine, Pinus sylvestris, cambium, light microscopy, Mediterranean environment, temporate environment, transmission electron microscopy, xylem
alepski bor, Pinus halepensis, Pinus sylvestris, kambij, svetlobna mikroskopija, mediteransko podnebje, rdeči bor, zmerno podnebje, transmisijska elektronska mikroskopija, ksilem
r2
Peter
Prislan
70
Jožica
Gričar
70
Martin
De Luis
70
Klemen
Novak
70
Edurne
Martinez Del Castillo
70
Uwe
Schmitt
70
Gerald
Koch
70
Jasna
Štrus
70
Polona
Mrak
70
Magda
Tušek-Žnidarič
70
Katarina
Čufar
70
UDK
4
630*81:630*11(045)=111
ISSN pri članku
9
1664-462X
DOI
15
10.3389/fpls.2016.01923
COBISS_ID
3
4650150
OceCobissID
13
3011663
Prislan2016.pdf
4859108
Predstavitvena datoteka
2017-07-18 12:11:43
0
Izvorni URL
2022-07-19 11:48:51