RNA-seq discovery, functional characterization, and comparison of sesquiterpene synthases from Solanum lycopersicum and Solanum habrochaites trichomes
作者:Petra M. Bleeker、Eleni A. Spyropoulou、Paul J. Diergaarde、Hanne Volpin、Michiel T. J. De Both、Philipp Zerbe、Joerg Bohlmann、Vasiliki Falara、Yuki Matsuba、Eran Pichersky、Michel A. Haring、Robert C. Schuurink
DOI:10.1007/s11103-011-9813-x
日期:2011.11
Solanum lycopersicum and Solanum habrochaites (f. typicum) accession PI127826 emit a variety of sesquiterpenes. To identify terpene synthases involved in the production of these volatile sesquiterpenes, we used massive parallel pyrosequencing (RNA-seq) to obtain the transcriptome of the stem trichomes from these plants. This approach resulted initially in the discovery of six sesquiterpene synthase cDNAs from S. lycopersicum and five from S. habrochaites. Searches of other databases and the S. lycopersicum genome resulted in the discovery of two additional sesquiterpene synthases expressed in trichomes. The sesquiterpene synthases from S. lycopersicum and S. habrochaites have high levels of protein identity. Several of them appeared to encode for non-functional proteins. Functional recombinant proteins produced germacrenes, β-caryophyllene/α-humulene, viridiflorene and valencene from (E,E)-farnesyl diphosphate. However, the activities of these enzymes do not completely explain the differences in sesquiterpene production between the two tomato plants. RT-qPCR confirmed high levels of expression of most of the S. lycopersicum sesquiterpene synthases in stem trichomes. In addition, one sesquiterpene synthase was induced by jasmonic acid, while another appeared to be slightly repressed by the treatment. Our data provide a foundation to study the evolution of terpene synthases in cultivated and wild tomato.
番茄(Solanum lycopersicum)和哈勃罗切特番茄(Solanum habrochaites)(f. typicum)的PI127826品系会释放多种倍半萜。为了鉴定参与这些挥发性倍半萜合成的萜合成酶,我们使用大规模平行测序(RNA-seq)获得了这些植物茎毛的转录组。这种方法最初发现了番茄(S. lycopersicum)的6个倍半萜合成酶cDNA和哈勃罗切特番茄(S. habrochaites)的5个倍半萜合成酶cDNA。通过对其他数据库和番茄(S. lycopersicum)基因组的搜索,又发现了2个在茎毛中表达的倍半萜合成酶。番茄(S. lycopersicum)和哈勃罗切特番茄(S. habrochaites)的倍半萜合成酶具有高度的蛋白质同源性。其中一些似乎编码无功能的蛋白质。功能性重组蛋白从(E,E)-法呢基二磷酸酯中产生香豆素、β-石竹烯/α-胡莫烯、绿花烯和瓦伦烯。然而,这些酶的活性并不能完全解释两种番茄植物在倍半萜合成方面的差异。RT-qPCR证实了番茄(S. ly