Endogenous hormone concentrations correlate with fructan metabolism throughout the phenological cycle inChrysolaena obovata

Abstract

The results show that fructan metabolism correlates well with endogenous hormone concentrations and environmental changes, suggesting that the co-ordinated action of carbohydrate metabolism and hormone synthesis enables C. obovata to survive unfavourable field conditions. Endogenous hormone concentrations seem to be related to regulation of fructan metabolism and to the transition between phenophases, signalling for energy storage, reserve mobilization and accumulation of oligosaccharides as osmolytes.

Fructan dynamics in the underground organs of Chresta exsucca (Asteraceae), a dry season flowering species

“…This indicates intense fructan synthesis and polymerization, which are catalyzed by 1-SST and 1-FFT, respectively. Increased 1-SST activity is induced by high sucrose levels (Ende & Laere 1996b), which could be a result of photoassimilate translocation from the senescing shoots towards underground organs, as is known to occur in Chrysolaena obovata (Rigui et al 2015). In all other phases, oligosaccharide levels were higher than polysaccharide levels, as expressed by a oligosaccharide:polysaccharide ratio > 1 (Fig.…”

“…The timing of phenological shifts in C. exsucca differs from that of other species of Asteraceae from the Cerrado, as exemplified by C. obovata (Carvalho & Dietrich 1993;Rigui et al 2015), A. discolor (Isejima & Figueiredo-Ribeiro 1993;Itaya et al 1999) and I. terminalis (Almeida et al 2017). These species have a well-defined phenological cycle with seasonal development, characterized by resprouting in the beginning of the rainy season, senescence and abscission of the aerial organs at the end of the rainy season, and dormancy of the underground organs in the dry season.…”

SELF-PRUNINGaffects auxin responses synergistically with the cyclophilin A DIAGEOTROPICA in tomato

“…Endogenous indole acetic acid (IAA) levels were determined by gas chromatography tandem mass spectrometry-selecting ion monitoring (GC-MS-SIM, Shimadzu model GCMS-QP2010 SE). Samples (50-100 mg fresh weight, FW) were extracted and methylated as described in (Rigui et al, 2015). About 0.25 μg of the labeled standard [ 13 C 6 ]IAA (Cambridge Isotopes, Inc.) was added to each sample as internal standards.…”

Anatomy and germination of diaspores of Chrysolaena cognata (Less.) Dematt. (Asteraceae)

“…No entanto, Cury et al (2010) também relacionaram a baixa germinabilidade de diásporos de Chresta sphaerocephala (Asteraceae) à eficiência da reprodução vegetativa pelo sistema subterrâneo radical, o que também foi postulado por Velten e Garcia (2008) para Eremanthus elaeagnus. Espécies de Chrysolaena apresentam órgãos sub-terrâneos de reserva, chamados rizóforos, que são ricos em frutanos, importantes carboidratos de reserva (Rigui et al, 2015). Santos (2017) verificou que C. cognata possui sistema subterrâneo do tipo morfológico tubérculo geminífero nos indivíduos adultos.…”