對(duì)體形極小的豌豆蚜來(lái)說(shuō),,它們的身體顏色關(guān)乎其生死:其身體的紅色和綠色變化決定了它們對(duì)野外不同的掠食者及寄生蟲的易感性。 如今,,研究人員發(fā)現(xiàn)了一種特別的被稱作立克次氏小體的細(xì)菌,,這種細(xì)菌可將該昆蟲的身體顏色從紅色變成綠色;這一發(fā)現(xiàn)清楚地表明,,遺傳學(xué)之外的因素也可影響這種重要的身體特征,。 Tsutomu Tsuchida及其同事對(duì)法國(guó)的豌豆蚜的基因組進(jìn)行了篩檢。當(dāng)時(shí)他們發(fā)現(xiàn),,有幾株綠色的豌豆蚜?xí)黾t色的后代,。
隨著這些豌豆蚜后代的成長(zhǎng),,研究人員注意到,該昆蟲的身體顏色也從紅色變成綠色,。 因此,,研究人員開(kāi)始調(diào)查已知的會(huì)感染蚜蟲并影響其范圍廣泛的諸如對(duì)高溫的耐受性或?qū)μ鞌车牡挚沽Φ忍卣鞯牟煌膬?nèi)生菌。 研究人員發(fā)現(xiàn)了一種過(guò)去未知的致病性共生菌,。
他們用抗菌素治療以清除該蚜蟲的其它感染以便聚焦于這種新發(fā)現(xiàn)的立克次氏小體,。 Tsuchida及其同事說(shuō),該立克次氏小體看來(lái)可增加蚜蟲中的藍(lán)-綠色素的量,,但一點(diǎn)也不會(huì)影響它們的黃-紅色素,。 根據(jù)這些發(fā)現(xiàn),他們建議,,該內(nèi)共生菌性的關(guān)系會(huì)影響掠食者-被掠食者之間的關(guān)系,,以及在這一眾所周知的昆蟲性害蟲的種群中的寄生關(guān)系。(生物谷Bioon.com)
生物谷推薦英文摘要
Science DOI: 10.1126/science.1195463
Symbiotic Bacterium Modifies Aphid Body Color
Tsutomu Tsuchida1,*?, Ryuichi Koga2,?, Mitsuyo Horikawa3, Tetsuto Tsunoda3, Takashi Maoka4, Shogo Matsumoto1, Jean-Christophe Simon5 and Takema Fukatsu2,*
1Molecular Entomology Laboratory, RIKEN Advanced Science Institute, Wako 351-0198, Japan.
2National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8566, Japan.
3Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan.
4Research Institute for Production Development, Kyoto 606-0805, Japan.
5Institut National de la Recherche Agronomique, UMR 1099 BiO3P, Institut National de la Recherche Agronomique (INRA)/Agrocampus Ouest/Université Rennes 1, BP 35327, 35653 Le Rheu Cedex, France.
Color variation within populations of the pea aphid influences relative susceptibility to predators and parasites. We have discovered that infection with a facultative endosymbiont of the genus Rickettsiella changes the insects’ body color from red to green in natural populations. Approximately 8% of pea aphids collected in Western Europe carried the Rickettsiella infection. The infection increased amounts of blue-green polycyclic quinones, whereas it had less of an effect on yellow-red carotenoid pigments. The effect of the endosymbiont on body color is expected to influence prey-predator interactions, as well as interactions with other endosymbionts.