Redifferentiation of leaflet tissues during midrib gall development in Copaifera langsdorffii (Fabaceae)
Redifferentiation of leaflet tissues during midrib gall development in Copaifera langsdorffii (Fabaceae)
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DOI：
10.1016/j.sajb.2009.10.011
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发表时间：
2010-04
影响因子：
3.1
通讯作者：
D. Oliveira;R. Isaias
中科院分区：
文献类型：
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作者：
D. Oliveira;R. Isaias
Copaifera langsdorffii是食草动物的超级宿主。这种植物具有很大的形态发生潜力，对20多种引起虫瘿的昆虫的刺激有不同的反应。其中，Cecidomyiidae的一个未描述的物种诱导中脉瘿，其中产生一个放射状的cecidogenetic领域和小叶组织再分化。我们的目标是评估的幅度，这cecidogenetic领域，其中小叶组织的影响，由cecidomyid的喂养行动;如何产生最终的胆汁形状;如果组织再分化赋予任何适应价值的瘿食草动物。小叶形态发生遵循的模式在文献中描述的简单的叶子，导致中生植物的安排。由于瘿形成的组织再分化显示，在中脉瘿，下表皮细胞分裂扩大瘿;海绵薄壁细胞起源的存储组织，分泌结构，和维管束;栅栏薄壁细胞变得均匀;和近轴表皮起源的营养组织。细胞伸长是细胞再分化的一个必要步骤，它是由新形成的木质部束引起的水向瘿部位的运输和液泡压力的增加所触发的。中脉瘿的最终形状的产生涉及重复的组织学步骤，以响应cecidogenetic场的振幅。瘿蚊取食作用的最大影响发生在由原表皮和近轴基分生组织再分化的虫瘿组织中，这为瘿蚊的虫瘿形成提供了有利条件。在营养价值、微环境和对天敌的保护作用方面对Langsdorffii midrib gall进行了研究。
The tree Copaifera langsdorffii is a superhost for galling herbivores. This plant species has great morphogenetic potential, and responds differently to the stimuli of more than 20 gall-inducing insects. Among these, an undescribed species of Cecidomyiidae induces a midrib gall in which a radial cecidogenetic field is generated and the leaflet tissues redifferentiate. Our objectives were to assess the amplitude of this cecidogenetic field, in which the leaflet tissues were influenced by the feeding action of the cecidomyiid; how the final gall shape was generated; and if tissue redifferentiation conferred any adaptive value on the galling herbivore. Leaflet morphogenesis followed the pattern described in the literature for simple leaves, resulting in a mesophytic arrangement. Tissue redifferentiation due to gall formation revealed that in a midrib gall, abaxial epidermal cells divided to enlarge the gall; spongy parenchyma cells originated the storage tissue, secretory structures, and vascular bundles; palisade parenchyma cells became homogeneous; and adaxial epidermis originated the nutritive tissue. Cell elongation, a necessary step towards cell redifferentiation, is triggered by an increase in water transport to the gall site and vacuole pressure due to neoformed xylem bundles. The generation of the final shape of the midrib gall involved repetitive histological steps in response to the amplitude of the cecidogenetic field. The largest impact of the cecidomyiid feeding action occurred in gall tissues redifferentiated from protoderm and adaxial ground meristem, which provided advantages to the gall maker of the C. langsdorffii midrib gall in terms of nutritional value, microenvironment, and protection against natural enemies.