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Title: Leaf trichomes in Metrosideros polymorpha can contribute to avoiding extra water stress by impeding gall formation
Authors: Amada, Gaku
Kobayashi, Keito
Izuno, Ayako
Mukai, Mana
Ostertag, Rebecca
Kitayama, Kanehiro
Onoda, Yusuke  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 小林, 慧人
北山, 兼弘
小野田, 雄介
Keywords: Leaf trichome
water limitation
insect interaction
Hawaiian psyllid
Metrosideros polymorpha
Issue Date: 14-Feb-2020
Publisher: Oxford University Press (OUP)
Journal title: Annals of botany
Volume: 125
Issue: 3
Start page: 533
End page: 542
Abstract: Background and Aims: Plants inhabiting arid environments tend to have leaf trichomes, but their adaptive significance remains unclear. Leaf trichomes are known to play a role in plant defence against herbivores, including gall makers. Because gall formation can increase water loss partly through increased surface area, we tested the novel hypothesis that leaf trichomes could contribute to avoiding extra water stress by impeding gall formation, which would have adaptive advantages in arid environments. Methods: We focused on Metrosideros polymorpha, an endemic tree species in the Hawaiian Islands, whose leaves often suffer from galls formed by specialist insects, Hawaiian psyllids (Pariaconus spp.). There is large variation in the amount of leaf trichomes (0–40 % of leaf mass) in M. polymorpha. Three gall types are found on the island of Hawaii: the largest is the ‘cone’ type, followed by ‘flat’ and ‘pit’ types. We conducted laboratory experiments to quantify the extent to which gall formation is associated with leaf water relations. We also conducted a field census of 1779 individuals from 48 populations across the entire range of habitats of M. polymorpha on the island of Hawaii to evaluate associations between gall formation (presence and abundance) and the amount of leaf trichomes. Key Results: Our laboratory experiment showed that leaf minimum conductance was significantly higher in leaves with a greater number of cone- or flat-type galls but not pit-type galls. Our field census suggested that the amount of trichomes was negatively associated with probabilities of the presence of cone- or flat-type galls but not pit-type galls, irrespective of environmental factors. Conclusion: Our results suggest that leaf trichomes in M. polymorpha can contribute to the avoidance of extra water stress through interactions with some gall-making species, and potentially increase the fitness of plants under arid conditions.
Rights: This is a pre-copyedited, author-produced version of an article accepted for publication in Annals of botany following peer review. The version of record Gaku Amada, Keito Kobayashi, Ayako Izuno, Mana Mukai, Rebecca Ostertag, Kanehiro Kitayama, Yusuke Onoda, Leaf trichomes in Metrosideros polymorpha can contribute to avoiding extra water stress by impeding gall formation, Annals of Botany, Volume 125, Issue 3, 14 February 2020, Pages 533–542, is available online at:
The full-text file will be made open to the public on 14 February 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1093/aob/mcz196
PubMed ID: 31784739
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