Plant genetics affects arthropod community richness and composition: Evidence from a synthetic eucalypt hybrid population
Plant genetics affects arthropod community richness and composition: Evidence from a synthetic eucalypt hybrid population
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DOI：
10.1111/j.0014-3820.2000.tb01238.x
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发表时间：
2000-12-01
期刊：
影响因子：
3.3
通讯作者：
Li, HF
中科院分区：
文献类型：
--
作者：
Dungey, HS;Potts, BM;Li, HF
为了研究植物种群遗传变异对节肢动物群落丰富度和组成的影响，我们对苦杏仁桉（Eucalyptus amygdalina）、栗树桉（e.r isdonii）及其FI代和高级杂交后代的节肢动物群落进行了量化。出现了五种主要模式。第一，纯种和杂交种支持的群落差异显著。物种丰富度在杂交种（F-1 > F-2 >扁桃粉>扁桃粉）上显著最高。这些结果与同一物种的野生种群的结果相似，并且代表了首次在合成种群和野生种群研究中都证实了群落结构的遗传成分。杂交种还通过积累亲本物种的共同和特殊分类群（野生种群为100%，合成种群为80%）而发挥生物多样性中心的作用。F(1)s的物种丰富度显著高于单个F(2)家族，表明杂交种上昆虫丰富度的增加可能不是由共适应基因复合物的分裂引起的。(4)节肢动物类群对F-1杂交表现出显性反应，而一般类群对F-1杂交表现出敏感反应。第五，在对31种被认为在植物防御中起作用的叶萜类化合物的分析中，杂种通常是亲本的中间化学型。在单个F-2家族中，我们发现单个树的群落与五种单独的油脂成分（包括油脂产量）之间存在显着关联，这表明遗传对植物防御化学有影响，进而可能影响群落结构。这些研究认为，杂交具有重要的群落水平影响，杂交区存在的遗传变异可用于探索基于遗传的群落结构机制。
To examine how genetic variation in a plant population affects arthropod community richness and composition, we quantified the arthropod communities on a synthetic population of Eucalyptus amygdalina, E. risdonii, and their FI and advanced-generation hybrids. Five major patterns emerged. First, the pure species and hybrid populations supported significantly different communities. Second, species richness was significantly greatest on hybrids (F-1 > F-2 > E. amygdalina > E. risdonii). These results are similar to those from a wild population of the same species and represent the first case in which both synthetic and wild population studies confirm a genetic component to community structure. Hybrids also acted as centers of biodiversity by accumulating both the common and specialist taxa of both parental species (100% in the wild and 80% in the synthetic population). Third, species richness was significantly greater on F(1)s than the single F-2 family, suggesting that the increased insect abundance on hybrids may not be caused by the breakup of coadapted gene complexes. Fourth, specialist arthropod taxa were most likely to show a dominance response to F-1 hybrids, whereas generalist taxa exhibited a susceptible response. Fifth, in an analysis of 31 leaf terpenoids that are thought to play a role in plant defense, hybrids were generally intermediate to the parental chemotypes. Within the single F-2 family, we found significant associations between the communities of individual trees and five individual oil components, including oil yield, demonstrating that there is a genetic effect on plant defensive chemistry that, in turn, may affect community structure. These studies argue that hybridization has important community-level consequences and that the genetic variation present in hybrid zones can be used to explore the genetic-based mechanisms that structure communities.