Maia A C D, Schlindwein C
Departamento de Zoologia, Universidade Federal de Pernambuco, Cidade Universitária, Av. Prof. Morais Rego, 1235, Recife, BR 50670-420, Brazil.
Plant Biol (Stuttg). 2006 Jul;8(4):529-34. doi: 10.1055/s-2006-924045.
Flowering, pollination ecology, and floral thermogenesis of Caladium bicolor were studied in the Atlantic Rainforest of Pernambuco, NE Brazil. Inflorescences of this species are adapted to the characteristic pollination syndrome performed by Cyclocephalini beetles. They bear nutritious rewards inside well-developed floral chambers and exhibit a thermogenic cycle which is synchronized to the activity period of visiting beetles. Heating intervals of the spadix were observed during consecutive evenings corresponding to the beginning of the female and male phases of anthesis. Highest temperatures were recorded during the longer-lasting female phase. An intense sweet odour was volatized on both evenings. Beetles of a single species, Cyclocephala celata, were attracted to odoriferous inflorescences of C. bicolor and are reported for the first time as Araceae visitors. All the inflorescences visited by C. celata developed into infructescences, whereas unvisited inflorescences showed no fruit development. Findings of previous studies in the Amazon basin of Surinam indicated that Cyclocephala rustica is a likely pollinator of C. bicolor. This leads to the assumption that locally abundant Cyclocephalini species are involved in the pollination of this species.
在巴西东北部伯南布哥州的大西洋雨林中,对双色芋的开花、传粉生态学和花的产热进行了研究。该物种的花序适应了Cyclocephalini甲虫所执行的典型传粉综合征。它们在发育良好的花腔内部提供营养奖励,并表现出一个与访花甲虫活动期同步的产热周期。在连续的夜晚观察到佛焰花序的加热间隔,对应于花期的雌蕊期和雄蕊期开始时。在持续时间较长的雌蕊期记录到最高温度。在这两个晚上都挥发着浓烈的甜味气味。一种单一物种的甲虫,即Celata Cyclocephala,被双色芋有气味的花序所吸引,并且首次被报道为天南星科的访客。所有被Celata Cyclocephala访问过的花序都发育成果序,而未被访问的花序则没有果实发育。在苏里南的亚马逊盆地先前研究的结果表明,Rustica Cyclocephala可能是双色芋的传粉者。这导致人们推测当地丰富的Cyclocephalini物种参与了该物种的传粉。