Date

2002

Author

Kandemir, Gaye Eren

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The purpose of the study was to determine the pattern of genetic variation in morphological and physiological traits associated with cold and drought stress using seedling from over-exploited and natural populations of Pinus brutia Ten. (Turkish red pine) from southern Turkey. To determine the pattern of genetic variation existing in over-exploited and natural populations, seedlings from 6 populations each with 40 families were raised in Ankara forest nursery from 1998-2000. Three of the populations (Yaylaalan, 111Çalkaya and Gölhisar) were over-exploited and the others (Alanya, Fethiye and Çameli) were relatively natural populations. In three growing seasons, 17 characters were recorded including cold and drought stress involved traits. The component of variation due to populations varied from 0% in height growth by second flush 1999 (SF99) to 45% in cold damage in 2000 (COLD00) while variance component due to families ranged from 4% in height growth in July 2000 (HTJ00) and height growth in August 2000 (HTA00) to 23% in germination (GER) and survival in July 1998 (SUR1). Over-exploited and natural population group did not vary significantly in studied seedling traits. Evaluation of materials with the nursery winter conditions of 1999 (the lowest temperature during the winter of 2000 was -5.9°C) and 2000 (-15.2°C) and chlorophyll fluorescence measurements showed that Çameli and Gölhisar populations were the most cold tolerant ones while Çalkaya was the least tolerant to cold. Family heritabilities for cold tolerance traits were moderate and suggest that by selection for cold tolerance among families from Çameli and Gölhisar populations, considerable amount of genetic gain could be achieved in one generation. The families, which were suffered greatly from frost, were also the ones suffered from drought. Furthermore, these families accumulated less height growth after induced water stress. The most drought sensitive population was Çalkaya population. There were no significant differences among other populations for drought tolerance. On the average, cold resistant families during the water stress ivexperiment had higher osmotic potential in needles and proline accumulation than cold sensitive families. So osmotic potential of seedlings on proline contents in needles of seedlings during the drought period could be used as a reliable trait for rapid screening of large families from drought tolerant populations.

Subject Keywords

Red pine, Chlorophyll, Plant genetics, Pinus brutia, Cold tolerance, Drought tolerance, Over-exploited population, Natural population, Chlorophyll fluorescence, Genetic variation

URI

https://hdl.handle.net/11511/12850

Collections

Graduate School of Natural and Applied Sciences, Thesis