Affiliation:
1. University of Bartın, Faculty of Forestry, Department of Silviculture, Bartın, Turkey
2. University of Kastamonu, Faculty of Forestry, Department of Silviculture, Kastamonu, Turkey
3. Institute for Forestry, Belgrade
Abstract
Frost-resistance variability of Scotch pine (Pinus sylvestris L. var. hamata
Steven) seedlings grown in nurseries conditions, originated from 10
provenances, have been analyzed. The provenances from Black Sea region,
Central Anatolian region and Eastern Anatolian region in Turkey have been
used in selection of seed zones. The results of frost-resistance tests
indicated a strong relationship of implemented freezing degrees with injury
degrees of Scotch pine needles and photosynthetic productivities. On the
other hand, another significant relationship has been determined between
chlorophyll fluorescence and ion leakage methods (r=-0.801). This result
shows that those two methods can be safely used in determining the damages
due to low temperatures. In frost resistance tests, Scotch pine seedlings
from different provenances have been frozen at -10, -20, -30 and -40?C.
According to the Duncan test results, it has been determined that damage
increased as temperature decreased. The damage level at -10?C implementation
is 3.5% which can be tolerated by plants. But when the temperature has been
decreased to -20?C, the level of damage has increased to 51.25%. As a result
of photosynthetic analyses in this phase, it has been determined that there
is a statistically significant relationship between provenances and
temperature levels. Under the light of those findings, they have determined
that the photosynthetic productivity has significantly decreased at
temperatures between -20?C and -40?C. This situation conforms to injury index
values determined in this study. As a result of injury index and
photosynthetic productivity tests used for determining the damage after
frost-resistance tests, it has been determined that the provenances of
Amasya-Kunduz, Bolu-Alada?, D?zce-Y???lca, Samsun-Vezirk?pr? and
Eski?ehir-?atac?k are more sensitive to frost than other provenances.
Publisher
National Library of Serbia