Do pollinators prefer bigger floral organs? A case study on Iris pumila L.
2018
Аутори:
Vuleta, AnaBudečević, Sanja
Manitašević Jovanović, Sanja
Tucić, Branka
Остала ауторства
Uzelac, BrankaТип документа:
Конференцијски прилог (Објављена верзија)
,
© 2018 by the Serbian Plant Physiology Society
Метаподаци
Приказ свих података о документуАпстракт:
Angiosperm flowers serve as an advertisement for pollinators and are, therefore, believed to
be shaped by pollinator-mediated selection. The large flower size, which is one of the distinct
characteristics of the genus Iris, might have evolved under the strong selective pressures imposed
by pollinators, either because larger flowers indicate more rewards or because the pollinators can
detect them from a greater distance. To test the role of visual floral signals in attracting pollinators and, consequently, pollination efciency, we compared the phenotypic expressions of flower
height and centroid size of petaloid floral organs: falls, standards and style arms, as well as anthocyanin absorption between naturally pollinated and non-pollinated flowers of I. pumila plants
grown in a common-garden experiment. Our results indicated that I. pumila pollinators generally
preferred taller flowers with greater organ sizes compared to the alternative ones. However, the
direction of pollinator-mediated selection appeared to be strongly flower organ-specifc: positive
on fall, negative on style arm and neutral on standard size. The observed results are in agreement
with the functions that each of these floral structures has in the pollination process: standards are
a long-distance reward signals, falls are landing platform for pollinating insects, while style arms,
as upper parts of the pollination tunnels, promote pollen deposition. We failed to corroborate the
existence of pollinator-mediated selection on anthocyanin absorption. This suggested that some
other aspects of flower colour might be more attractive to insect pollinators, or that different biotic or abiotic factors could account for the maintenance of flower colour polymorphism in I. pumila.
Кључне речи:
floral organ size; anthocyanins; pollinator attraction; Iris pumilaФинансирање / пројекти:
- Еволуција у лабораторији и адаптације у природи (RS-MESTD-Basic Research (BR or ON)-173007)
У:
- Uzelac B, editor. Book of abstracts. 3rd International Conference on Plant Biology (22nd SPPS Meeting); 2018 Jun 9-12; Belgrade, Serbia. Belgrade: Serbian Plant Physiology Society; Institute for Biological Research "Siniša Stanković"; Faculty of Biology; 2018. p. 86.