Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1093/jxb/erv408
Title (Primary) Endogenous rhythmic growth in oak trees is regulated by internal clocks rather than resource availability
Author Herrmann, S.; Recht, S.; Boenn, M.; Feldhahn, L.; Angay, O.; Fleischmann, F.; Tarkka, M.T.; Grams, T.E.E.; Buscot, F.
Source Titel Journal of Experimental Botany
Year 2015
Department BZF; BOOEK; iDiv
Volume 66
Issue 22
Page From 7113
Page To 7127
Language englisch
Keywords Ectomycorrhiza; growth cessation; Piloderma croceum; Quercus robur; RNASeq; stable isotope labelling
UFZ wide themes RU1
Abstract Common oak trees display endogenous rhythmic growth with alternating shoot and root flushes. To explore the mechanisms involved, microcuttings of the Quercus robur L. clone DF159 were used for 13C/15N labelling in combination with RNA sequencing (RNASeq) transcript profiling of shoots and roots. The effect of plant internal resource availability on the rhythmic growth of the cuttings was tested through inoculation with the ectomycorrhizal fungus Piloderma croceum. Shoot and root flushes were related to parallel shifts in above- and below-ground C and, to a lesser extent, N allocation. Increased plant internal resource availability by P. croceum inoculation with enhanced plant growth affected neither the rhythmic growth nor the associated resource allocation patterns. Two shifts in transcript abundance were identified during root and shoot growth cessation, and most concerned genes were down-regulated. Inoculation with P. croceum suppressed these transcript shifts in roots, but not in shoots. To identify core processes governing the rhythmic growth, functions [Gene Ontology (GO) terms] of the genes differentially expressed during the growth cessation in both leaves and roots of non-inoculated plants and leaves of P. croceum-inoculated plants were examined. Besides genes related to resource acquisition and cell development, which might reflect rather than trigger rhythmic growth, genes involved in signalling and/or regulated by the circadian clock were identified. The results indicate that rhythmic growth involves dramatic oscillations in plant metabolism and gene regulation between below- and above-ground parts. Ectomycorrhizal symbiosis may play a previously unsuspected role in smoothing these oscillations without modifying the rhythmic growth pattern.
Persistent UFZ Identifier
Herrmann, S., Recht, S., Boenn, M., Feldhahn, L., Angay, O., Fleischmann, F., Tarkka, M.T., Grams, T.E.E., Buscot, F. (2015):
Endogenous rhythmic growth in oak trees is regulated by internal clocks rather than resource availability
J. Exp. Bot. 66 (22), 7113 - 7127 10.1093/jxb/erv408