A Study on Heat Tolerance of Six Fern Species from Northern China

doi:10.11924/j.issn.1000-6850.casb2023-0248

Abstract

Abstract:

In order to guide the selection of fern materials for landscape in the summer high-temperature environment of northern China, this study compared the heat resistance of six native fern species from northern China using parameters such as electrical conductivity, half-lethal temperature, and cell damage rate. Pteridium aquilinum var. latiusculum, Onoclea sensibilis var. interrupta, Matteuccia struthiopteri, Dryopteris crassirhizoma, D. expansa, and Athyrium sinense were selected for heat stress treatment. The relative conductivity of them was determined under gradient temperature treatment conditions, and the half-lethal temperature (LT₅₀) was calculated by a Logistic equation. Simultaneously, measurements of fern leaf epidermis structure (leaf area, leaf weight, stomata density), chlorophyll content, and photosynthetic data were also conducted. On such a basis, the correlation between the heat resistance of ferns and each measurement indicator was analyzed and then tested using field observation data. Combining with geographical distribution characteristics of ferns, the thermal resistance of each experimental material was comprehensively evaluated. The results showed that with the increase of temperature, the cell damage rate showed an ‘S’ curve (slow-fast-slow). The ranking of six fern species based on half-lethal temperature ranges from highest to lowest was as follows: D. crassirhizoma (63.77℃)> A. sinense (62.07℃)> D. expansa (61.63℃)> M. struthiopteris (61.13℃)> O. sensibilis var. interrupta (58.10℃)> P. aquilinum var. latiusculum (56.70℃). The field observation data were generally consistent with the conductivity data and the geographical distribution characteristics of ferns. LT₅₀ could be used as one of the evaluating factors for the heat tolerance of ferns. The epidermal morphology of leaves can also be used as a reference for heat tolerance. The selection results can enrich the types of ferns used in garden display in Beijing.

Key words: ferns, heat resistance, electrical conductivity, half-lethal temperature, Logistic equation

WU Fei, LI Peng, WANG Wei, CUI Yulian, XU Yuqing, LU Shanshan, ZHAO Baolin. A Study on Heat Tolerance of Six Fern Species from Northern China[J]. Chinese Agricultural Science Bulletin, 2023, 39(34): 92-97.

Figures/Tables 6

References 27

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植物名称	方程参数		相关系数	半致死温度/℃
植物名称	lna	b	相关系数	半致死温度/℃
荚果蕨	10.7830	0.1764	0.7918	61.13
蕨	8.5109	0.1501	0.8597	56.70
球子蕨	9.3598	0.1613	0.9012	58.03
中华蹄盖蕨	10.5140	0.1694	0.8639	62.07
粗茎鳞毛蕨	12.4280	0.1949	0.9109	63.77
广布鳞毛蕨	11.8080	0.1916	0.9350	61.63

植物名称	方程参数		相关系数	半致死温度/℃
植物名称	lna	b	相关系数	半致死温度/℃
荚果蕨	10.7830	0.1764	0.7918	61.13
蕨	8.5109	0.1501	0.8597	56.70
球子蕨	9.3598	0.1613	0.9012	58.03
中华蹄盖蕨	10.5140	0.1694	0.8639	62.07
粗茎鳞毛蕨	12.4280	0.1949	0.9109	63.77
广布鳞毛蕨	11.8080	0.1916	0.9350	61.63

植物名称	叶面积/cm²	比叶重/(mg/cm²)	气孔密度/(个/mm²)
荚果蕨	3.20	36.66	102
蕨	3.05	31.05	81
球子蕨	1.52	30.88	82
中华蹄盖蕨	5.80	39.71	131
粗茎鳞毛蕨	5.95	64.84	144
广布鳞毛蕨	4.00	42.32	125

植物名称	叶面积/cm²	比叶重/(mg/cm²)	气孔密度/(个/mm²)
荚果蕨	3.20	36.66	102
蕨	3.05	31.05	81
球子蕨	1.52	30.88	82
中华蹄盖蕨	5.80	39.71	131
粗茎鳞毛蕨	5.95	64.84	144
广布鳞毛蕨	4.00	42.32	125

植物名称	色素含量				最大净光合速率/[μmolCO₂/(m²·s)]
植物名称	叶绿素a/[mg/(g·FW)]	叶绿素b/[mg/(g·FW)]	总叶绿素/[mg/(g·FW)]	叶绿素a/叶绿素b	最大净光合速率/[μmolCO₂/(m²·s)]
荚果蕨	1.509	0.326	1.836	4.640	3.7
蕨	1.768	0.505	2.273	3.500	4.2
球子蕨	1.965	0.783	2.747	2.511	3.3
中华蹄盖蕨	0.848	0.140	0.988	6.116	2.9
粗茎鳞毛蕨	0.481	0.262	0.743	1.842	3.8
广布鳞毛蕨	2.684	1.229	3.913	2.184	1.8