Grayanotoxin I variation across tissues and species of Rhododendron suggests pollinator-herbivore defence trade-offs

被引：4

作者：

Fattorini, Roisin ^{[1
,2
,4
]}

Egan, Paul A. ^{[3
]}

Rosindell, James ^{[1
]}

Farrell, Iain W. ^{[4
]}

Stevenson, Philip C. ^{[4
,5
]}

机构：

[1] Imperial Coll London, Dept Life Sci, Silwood Pk Campus, Ascot SL5 7PY, Berks, England

[2] Univ Liverpool, Inst Syst Mol & Integrat Biol, Dept Biochem & Syst Biol, Liverpool L69 7ZB, England

[3] Swedish Univ Agr Sci, Dept Plant Protect Biol, POB 102, S-23053 Alnarp, Sweden

[4] Royal Bot Gardens, Richmond TW9 3AE, England

[5] Univ Greenwich, Nat Resources Inst, Chatham Maritime, Kent ME4 4TB, England

来源：

PHYTOCHEMISTRY | 2023年 / 212卷

关键词：

Rhododendron; Ericaceae; Plant defence; Functional trade-offs; Phenotypic correlation; Nectar chemicals; Grayanotoxin; SECONDARY METABOLITES; CHEMICAL DEFENSE; NECTAR; EVOLUTION; PLANTS; BRADYCARDIA; ATTRACTION; GRAYANOIDS; RESISTANCE; ERICACEAE;

D O I：

10.1016/j.phytochem.2023.113707

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Grayanotoxin I (GTX I) is a major toxin in leaves of Rhododendron species, where it provides a defence against insect and vertebrate herbivores. Surprisingly, it is also present in R. ponticum nectar, and this can hold important implications for plant-pollinator mutualisms. However, knowledge of GTX I distributions across the genus Rhododendron and in different plant materials is currently limited, despite the important ecological function of this toxin. Here we characterise GTX I expression in the leaves, petals, and nectar of seven Rhododendron species. Our results indicated interspecific variation in GTX I concentration across all species. GTX I concentrations were consistently higher in leaves compared to petals and nectar. Our findings provide preliminary evidence for phenotypic correlation between GTX I concentrations in defensive tissues (leaves and petals) and floral rewards (nectar), suggesting that Rhododendron species may commonly experience functional trade-offs between herbivore defence and pollinator attraction.

引用

页数：7