Journal of Experimental Botany, Vol. 66, No. 3 pp. 945–956, 2015 doi:10.1093/jxb/eru451 Advance Access publication 24 November, 2014 This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details) RESEArCH PApEr Auxin involvement in tepal senescence and abscission in Lilium: a tale of two lilies Lara Lombardi1, Laia Arrom2,3, Lorenzo Mariotti1, Riccardo Battelli4, Piero Picciarelli4, Peter Kille3, Tony Stead5, Sergi Munné-Bosch2 and Hilary J. Rogers3,* 1 Department of Biology, University of Pisa, Via Ghini 5, 56126 Pisa, Italy 2 Department of Plant Biology, Faculty of Biology, University of Barcelona, Avinguda Diagonal, 645, 08028 Barcelona, Spain 3 School of Biosciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK 4 Department of Agriculture, Food and Environment, University of Pisa, Via Mariscoglio 34, 56124 Pisa, Italy 5 School of Biological Sciences, Royal Holloway, University of London, Egham Hill, Egham, Surrey TW20 0EX, UK * To whom correspondence should be addressed. E-mail:
[email protected] Received 4 September 2014; Revised 9 October 2014; Accepted 13 October 2014 Abstract Petal wilting and/or abscission terminates the life of the flower. However, how wilting and abscission are coordinated is not fully understood. There is wide variation in the extent to which petals wilt before abscission, even between cultivars of the same species. For example, tepals of Lilium longiflorum wilt substantially, while those of the closely related Lilium longiflorum×Asiatic hybrid (L.A.) abscise turgid. Furthermore, close comparison of petal death in these two Lilium genotypes shows that there is a dramatic fall in fresh weight/dry weight accompanied by a sharp increase in ion leakage in late senescent L.