寄主植物对桑寄生植物叶片功能性状的影响

Effects of Host Plants on Leaf Functional Traits of Mistletoes

摘要:

为了解寄生植物叶片功能性状的差异及其影响因素，研究了西双版纳地区寄主植物对3种桑寄生植物叶片功能性状的影响，并分析了桑寄生植物与寄主植物叶片功能性状的相关性。结果表明，不同寄主植物的相同寄生植物叶片功能性状存在显著差异，来自7种寄主植物的五蕊寄生(Dendrophthoe pentandra)的叶片含水量(61.2%~70.1%)、氮含量(9.6~16.0 g/kg)、碳氮比(30.8~48.5)以及缩合单宁含量(3.3%~11.0%)等性状的差异较大；从4种寄主植物上获取的澜沧江寄生(Scurrula chingii var. yunnanensis)的叶片含水量(60.0%~71.7%)、碳含量(431.3~502.3 g/kg)和缩合单宁含量(3.8%~9.9%)等性状也呈现较大种间差异，而在2种寄主植物上的离瓣寄生(Helixanthera parasitica)的叶片功能性状没有显著差异。桑寄生植物与寄主植物的叶片含水量、总碳含量、总氮含量、碳氮比和缩合单宁含量呈显著的正相关。寄主植物作为桑寄生植物营养物质的主要来源，会影响桑寄生植物叶片的相应功能性状。桑寄生植物能从寄主植物获取部分的水、碳、氮以及缩合单宁，但对不同元素的获取能力因寄主种类不同而有所差别。

Abstract:

In order to understand the differences of leaf functional traits of parasitic plants and their influencing factors, the effects of host plants on leaf functional traits of three mistletoes in Xishuangbanna were studied, and the correlation between leaf functional traits of mistletoes and host plants was analyzed. The results showed that there were significant differences in leaf functional traits of the same mistletoes from different host plants. The leaf water content (61.2%-70.1%), nitrogen concentration (9.6-16.0 g/kg), C/N (30.8-48.5), and condense tannin content (3.3%-11.0%) of Dendrophthoe pentandra displayed significant differences among its seven host species. Besides, the leaf water content (60.0%-71.7%), carbon concentration (431.3-502.3 g/kg), and condense tannin content (3.8%-9.9%) of Scurrula chingii var. yunnanensis also showed significant difference among its four host species, but there was no significant difference in functional traits of Helixanthera parasitica from its two host species. In general, leaf water content, carbon concentration, nitrogen concentration, C/N, and condense tannin content had positive significant correlation between mistletoes and their host plants. Therefore, it was concluded that host plants as nutrient resource could influence leaf functional traits of mistletoe. Mistletoe obtains water, carbon, nitrogen, and condense tannin from the host plant; but the ability to obtain different elements varies with host species.