| Study on physiological anatomical characteristics and cold resistance of 7 Corylus heterophylla×C. Avellana varieties |
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| DOI：10.7606/j.issn.1000-7601.2023.05.15 |
| Key Words: hazelnut cold resistance physiological characteristics leaf anatomical structure principal component analysis |
| Author Name | Affiliation | | LIU Zaiguo | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | ZHAO Tong | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China
Gansu Woody Oil Engineering Research Center, Lanzhou ,Gansu 730020, China | | MA Chao | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | ZHAO Mengjiong | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China | | CHEN Weiqing | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730020, China
Gansu Woody Oil Engineering Research Center, Lanzhou ,Gansu 730020, China |
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| Abstract: |
| The purpose of this study was to preliminarily evaluate the physiological response mechanism of hazelnut to low temperature stress and select cold resistant varieties suitable for planting in high cold regions of Gansu Province. The dormant branches of 7 varieties introduced by Liaoning Economic Forestry Research Institute were used as experimental materials. They were treated with low temperature, and their photosynthesis and related physiological indexes were measured. Meanwhile, the microstructure of leaves of different varieties was observed by paraffin section, and the cold resistance of each variety was comprehensively evaluated by principal component analysis. The results showed that: (1) The highest Pn values of Dawei were 20.7（July）, 11.8（August）and 8.7（September） in different periods, respectively. The lowest Gs of Liaozhen 8 occurred in July and September with 0.11（July） and 0.06（September）, and the lowest Gs was 0.133 mmol·m-2·s-1 of Liaozhen 3 in August; In September, the variety Liaozhen 9 exhibited the highest value of 334.33 μmol·mol-1.On the other hand, the lowest value of Tr, observed in the variety Yuzhui, was only 0.74 mmol·m-2·s-1. (2) Under different temperature treatments (except -20℃), the soluble sugar content of Liaozhen 8 was higher than other varieties. At -30℃, the starch content of Liaozhen 9 was significantly lower than other varieties, which was 19.86 μg·g-1. The starch content of each variety decreased to its lowest level at -25℃, measuring 29.86（Dawei）, 28.98(Liaozhen 8), 19.63(Liaozhen 7), 24.56(Yuzhui), 18.56(Liaozhen 9), 14.44(Liaozhen 3) μg·g-1 and 19.68(Liaozhen 4) μg·g-1, respectively. (3) The proline and malondialdehyde contents as well as superoxide dismutase activity of Dawei reached the highest values at -30℃, respectively. The increase in conductivity content of variety Liaozhen 3 was significantly higher than other varieties at 75.88%, while the lowest increase in conductivity was observed in Yuzhui at 48.65%. (4) As observed by paraffin section, Dawei had the highest thickness of fenestrated and spongy tissues at 168.6 μm and 97.6 μm, respectively. The leaf thickness of all varieties reached 120 μm, and the leaf laxity of Dawei was the highest at 0.62. The thickness of both upper and lower epidermis of Dawei and Liaozhen 7 was above 10 μm. The upper and lower epidermal thicknesses of Liaozhen 3 were the smallest among the seven varieties, at 13.8 μm and 7.5 μm, respectively. According to the comprehensive evaluation of the indicators based on the principal component analysis, it was found that among the seven hazelnut varieties, Dawei had the highest comprehensive score (91.131), Liaozhen 7 and Yuzhui scored the second highest and Liaozhen 3 had the lowest score. Therefore Dawei, Liaozhen 7 and Yuzhui varieties had better cold resistance than other varieties and should be used as reference varieties for demonstration and promotion of cold tolerance in alpine regions. |
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