Evaluation on Cold Resistance of Four Juglans Species in Leaf-expansion Period

ACTA HORTICULTURAE SINICA ›› 2012, Vol. 39 ›› Issue (12): 2439-2446.

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Evaluation on Cold Resistance of Four Juglans Species in Leaf-expansion Period

TIAN Jing-Hua, WANG Hong-Xia, GAO Yi, ZHANG Zhi-Hua

（1College of Horticulture，Agricultural University of Hebei，Baoding，Hebei 071001，China； 2 Mountainous Areas Research Institute，Agricultural University of Hebei，Baoding，Hebei 071001，China）

Online:2012-12-25 Published:2012-12-25

Abstract

Abstract: The test materials were leaves in leaf-expansion period of 20 Juglans germplasms that belong to four species including J. regia L.，J. hopeiensis Hu，J. mandshurica Maxim.，or J. nigra L. The semi-lethal temperatures（LT₅₀）were estimated by electric conductivity method with Logistic equation. Leaf anatomical structures were observed with paraffin section. The correlations between leaf anatomical structures and its cold resistance were analyzed. The results as follows：The relative electrical conductivities（REC）of walnut leaves were rising with the decrease of the temperature. There were great differences in cold resistance of Juglans germplasms in leaf-expansion period. The semi-lethal temperatures of leaves were from–8℃to 2℃. There were cold resistant germplasms among J. nigra L.，J. mandshuria Maxim. and J. regia L. in leaf-expansion period. There were significant positive correlations（P < 0.01）between the LT₅₀ and REC of leaves treated at 0 ℃ or–3 ℃，and the correlation coefficients were high. LT₅₀ and the REC of leaves treated at 0 ℃ or–3 ℃ for 12 h could be used as physical indicators for cold resistance of Juglans leaves. The main structures of Juglans germplasms leaves were similar，meanwhile there were some specific characteristics for each species. There were significant negative correlations（P < 0.01) between LT₅₀ and the thickness of palisade tissue or leaf blade. The thickness of palisade tissue and leaf blade could be anatomical structure indicators for cold resistance of leaves.

Key words: Juglans, leaf-expansion period, cold resistance, electric conductivity method, semi-lethal temperature, leaf anatomical structure

CLC Number:

S 664.1

TIAN Jing-Hua, WANG Hong-Xia, GAO Yi, ZHANG Zhi-Hua. Evaluation on Cold Resistance of Four Juglans Species in Leaf-expansion Period[J]. ACTA HORTICULTURAE SINICA, 2012, 39(12): 2439-2446.

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Evaluation on Cold Resistance of Four Juglans Species in Leaf-expansion Period

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