Journal of Nuclear Agricultural Sciences

Characteristics of Wax Components in Leaves of Rubber Trees at Different Phenological Stages and Their Effects on Resistance to Erysiphe quercicola

CAO Zhiqi, XU Congying, LIANG Xiaoyu, LI Kunlin, ZHOU Shaoyao, WANG Meng, ZHANG Yu

Journal of Nuclear Agricultural Sciences, 2025, 39(11): 2559-2567. DOI: 10.11869/j.issn.1000-8551.2025.11.2559

组分 Component	名称 Name	分子式 Formula	CAS号 CAS number	古铜期 Bronze stage	淡绿期 Light green stage	成熟期 Mature stage
烷烃 Alkanes	十九烷	C₁₉H₄₀	629-92-5	0.021±0.013b	0.049±0.021ab	0.101±0.022a
	二十一烷	C₂₁H₄₄	629-94-7	0.002±0.002c	0.105±0.012b	0.532±0.010a
	二十七烷	C₂₇H₅₆	593-49-7	2.827±0.357b	4.797±0.106b	10.884±1.385a
	四十四烷	C₄₄H₉₀	7098-22-8	0.153±0.025b	0.590±0.152a	0.693±0.036a
醇类 Alcohols	1-十六醇	C₁₆H₃₄O	32253-82-4	0.012±0.000a	0.024±0.011a	0.018±0.007a
	1-十八醇	C₂₈H₅₈O	67905-27-5	0.004±0.001b	0.010±0.001b	0.066±0.003a
	1-二十二醇	CH₃（CH₂）₂₁OH	661-19-8	0.006±0.001b	0.018±0.001a	—
三萜类 Triterpenes	表皮酚	C₃₀H₅₀O	4439-99-0	0.005±0.001b	0.009±0.000b	0.046±0.001a
	角鲨烯	C₃₀H₅₀	111-02-4	0.124±0.010b	0.338±0.009b	1.101±0.383a
	表木栓醇	C₃₀H₅₂O	16844-71-6	—	—	0.635±0.098a
	木栓酮	C₃₀H₅₀O	559-74-0	—	—	1.116±0.164a
酮类 Ketones	2-十九酮	C₁₉H₃₈O	629-66-3	0.007±0.001c	0.023±0.000b	0.016±0.003a
脂肪酸类 Fatty acids	棕榈酸	C₁₆H₃₁NaO₂	57-10-3	0.008±0.000c	0.191±0.048b	0.437±0.006a
脂肪酸类 Fatty acids	硬脂酸	C₁₈H₃₆O₂	57-11-4	0.014±0.000b	0.047±0.011b	0.105±0.018a
酯类 Esters	邻苯二甲酸二（2-乙基己）酯	C₂₄H₃₈O₄	117-81-7	—	0.098±0.014b	0.156±0.057a
烯烃类 Alkenes	1-六烯烃	C₂₆H₅₂	18835-33-1	0.018±0.003b	0.101±0.006a	0.107±0.004a

Table 1 Key components of wax in rubber tree leaves at different phenological stages

Other figure/table from this article

Fig.1 Erysiphe quercicola infection severity on rubber tree leaves at various phenological stages at 3 and 7 days post-inoculation
Note： Different lowercase letters in the figure indicate significant differences among different phenological stages at the same time point （P<0.05）. The same as following.
Fig.2 The growth of Erysiphe quercicola spores on the leaf wax of rubber trees at different phenological stages
Fig.3 Scanning electron microscope images of rubber leaves at different phenological stages
Note： A， D， and G are the leaves of rubber trees in bronze， light green and mature stages respectively. B， E， and H are magnified 4 000 times. C， F， and I are magnified 8 000 times.
Fig.4 Wax content of rubber tree leaves at different phenological stages
Note： Different lowercase letters in the figure indicate significant differences among various phenological stages （P<0.05）.
Fig.5 Effects of exogenous spraying of friedelin and friedelan-3beta-ol on the growth of Erysiphe quercicola on rubber trees
Note： Different lowercase letters in the figure indicate significant differences among various treatments at the same time point （P<0.05）. The same as following.
Fig.6 Disease incidence after spraying friedelin and friedelan-3beta-ol