中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
甜橙提取物 | D-limonene | 5989-27-5 | C10H16 | 136.237 |
In conifers, terpene synthases (TPSs) of the gymnosperm-specific TPS-d subfamily form a diverse array of mono-, sesqui-, and diterpenoid compounds, which are components of the oleoresin secretions and volatile emissions. These compounds contribute to defence against herbivores and pathogens and perhaps also protect against abiotic stress.
The availability of extensive transcriptome resources in the form of expressed sequence tags (ESTs) and full-length cDNAs in several spruce (
The functional diversity of these characterized TPSs parallels the diversity of terpenoids found in the oleoresin and volatile emissions of Sitka spruce and provides a context for understanding this chemical diversity at the molecular and mechanistic levels. The comparative characterization of Sitka spruce and Norway spruce diterpene synthases revealed the natural occurrence of TPS sequence variants between closely related spruce species, confirming a previous prediction from site-directed mutagenesis and modelling.
在针叶树中,松柏烯合酶(TPSs)是针叶树特有的TPS-d亚家族的一部分,形成了多种单萜、倍半萜和二萜化合物,这些化合物是松香分泌物和挥发物的组成部分。这些化合物有助于防御食草动物和病原体,也可能对抗非生物胁迫。
几种云杉(Picea)物种中表达序列标签(EST)和全长cDNA等广泛转录组资源的可用性,使我们估计针叶树基因组至少包含69个独特且转录活跃的TPS基因。这个数字与任何已测序和注释良好的被子植物基因组中发现的TPS数量相当。我们对总共21个云杉TPS进行了功能特性化:12个来自西卡云杉(P. sitchensis),5个来自白云杉(P. glauca),4个来自白云杉杂交种(P. glauca × P. engelmannii),其中包括15个单萜合酶,4个倍半萜合酶和2个二萜合酶。
这些特性化的TPS的功能多样性与西卡云杉的松香和挥发物中发现的萜类多样性相似,并为理解分子和机制水平上的化学多样性提供了背景。比较特性化的西卡云杉和挪威云杉二萜合酶揭示了密切相关的云杉物种之间TPS序列变异的自然发生,从而证实了来自位点定向突变和建模的先前预测。