Volume 5, Issue 1 (9-2025)
jfer 2025, 5(1): 15-25 |
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Karimi hajii pamogh K, zolfaghari R, Fayyaz P. (2025). Assessing phenological plasticity and frost resistance in three Zagros oak species using a common garden approach. jfer. 5(1), : 2
URL: http://yujs.yu.ac.ir/jzfr/article-1-142-en.html
URL: http://yujs.yu.ac.ir/jzfr/article-1-142-en.html
Yasouj University , khaled0872@gmail.com
Abstract: (84 Views)
Background and objectives: Cold is one of the severe and limiting environmental stresses in forest ecosystems, particularly in temperate regions. With climate change affecting plant phenology and altering cold resistance in spring and autumn (notably in seedlings), it is crucial to identify species and genotypes that exhibit resilience. Therefore, this study focused on assessing the cold tolerance of seedlings from three species: Quercus brantii, Q. infectoria, and Q. libani, and examining how this tolerance relates to their phenological traits, such as bud burst and leaf senescence.
Materials and methods: Seeds from 54 mother trees were collected from the Baneh forest region (located in the Northern Zagros, characterized by higher altitude, latitude, and colder temperatures) and sown in a communal garden in Yasuj (found in the Southern Zagros, with lower altitude, latitude, and warmer conditions) for two years. Various phenological parameters (including the timing, rate, and speed of leaf bud burst and leaf senescence) as well as survival rates and damage of the terminal bud of the seedlings were recorded and analyzed at different time intervals using statistical methods such as repeated measures analysis of variance, Duncan's test, and Pearson correlation.
Results: The results of this research indicated that seedlings of different oak species exhibit notable differences in leaf bud burst speed, damage to seedlings, and survival rates. Specifically, the Q. brantii opened its buds approximately 3-4 days earlier and more rapidly, while, it showed the least damage to the terminal bud and the highest survival rate. In contrast, the Q. infectoria opened its buds later and more slowly than other species and suffered the most damage to the terminal bud and had the lowest survival rate. Additionally, correlation analysis revealed that seedlings with faster bud opening in the early growing season tend to have more terminal bud damage but also higher survival rates. Furthermore, the results of leaf senescence also showed that there was no significant difference among the three species in two years, although a positive correlation between the speed of bud burst and the leaf senescence.
Conclusion: The findings of this research suggest that the Q. brantii exhibits greater resistance to late spring frosts due to its favorable phenology (earlier and faster bud burst) and reduced bud susceptibility to cold. Consequently, it is less affected by late spring frosts associated with climate change compared to the other two species studied. Therefore, it is recommended to planted the Q. infectoria and Q. libani species more in the higher and cooler regions of the Zagros, and to select seeds from genotypes that have a later bud burst in spring for breeding programs.
Materials and methods: Seeds from 54 mother trees were collected from the Baneh forest region (located in the Northern Zagros, characterized by higher altitude, latitude, and colder temperatures) and sown in a communal garden in Yasuj (found in the Southern Zagros, with lower altitude, latitude, and warmer conditions) for two years. Various phenological parameters (including the timing, rate, and speed of leaf bud burst and leaf senescence) as well as survival rates and damage of the terminal bud of the seedlings were recorded and analyzed at different time intervals using statistical methods such as repeated measures analysis of variance, Duncan's test, and Pearson correlation.
Results: The results of this research indicated that seedlings of different oak species exhibit notable differences in leaf bud burst speed, damage to seedlings, and survival rates. Specifically, the Q. brantii opened its buds approximately 3-4 days earlier and more rapidly, while, it showed the least damage to the terminal bud and the highest survival rate. In contrast, the Q. infectoria opened its buds later and more slowly than other species and suffered the most damage to the terminal bud and had the lowest survival rate. Additionally, correlation analysis revealed that seedlings with faster bud opening in the early growing season tend to have more terminal bud damage but also higher survival rates. Furthermore, the results of leaf senescence also showed that there was no significant difference among the three species in two years, although a positive correlation between the speed of bud burst and the leaf senescence.
Conclusion: The findings of this research suggest that the Q. brantii exhibits greater resistance to late spring frosts due to its favorable phenology (earlier and faster bud burst) and reduced bud susceptibility to cold. Consequently, it is less affected by late spring frosts associated with climate change compared to the other two species studied. Therefore, it is recommended to planted the Q. infectoria and Q. libani species more in the higher and cooler regions of the Zagros, and to select seeds from genotypes that have a later bud burst in spring for breeding programs.
Article number: 2
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