INFIVE   05416
INSTITUTO DE FISIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Changes in leaf hormone concentrations in soybeans growing under non-inductive photoperiods after flowering.
Autor/es:
CANO, MARÍA GABRIELA; GUIAMET, JUAN JOSÉ; KELLY, SANTIAGO JULIÁN.; TAMBUSSI, EDUARDO ALBERTO; FANELLO, DIEGO DARÍO
Lugar:
Santa Fe
Reunión:
Congreso; XXXIII Argentinian meeting of plant physiology; 2021
Institución organizadora:
Sociedad Argentina de Fisiologia vegetal
Resumen:
In soybeans (Glicinemax L. Merr) short days induce or accelerate flowering. In plants exposedto non-inductive photoperiods (i.e. long days) after flowering theduration of post-flowering developmental stages is lengthened, with a concomitantdelay of leaf senescence and pod development. Since changes in hormoneconcentrations could underlie these responses, the aim of this work was to determinateif non-inductive photoperiodic after flowering altered leaf hormonalconcentrations. Plants of soybean growing under field conditions were exposed toinductive (natural day length) or non-inductive (natural day length + 4 hsartificial light) photoperiods starting at flowering. At 17, 24, 36 and 58Thermal days (Td) after flowering, leaf concentration of salicylic acid (SA), indole aceticacid (IAA), jasmonic acid (JA), abscisic acid (ABA), zeatin (Z), dihydrozeatin(DHZ), isopentenyladenine (iP) and gibberellic acid (GA1 and GA3) were measured.At 17, 24 and 36 Td there were no significant differences between photoperiods inthe concentration of none of these hormones. At 58 Td the plants undernon-inductive photoperiod had significantly higher leaf concentrations of GA1,Z and iP compared to inductive photoperiods. The increased concentrations of Zand iP may be partly responsible for delayed leaf senescence, whereas changesof GA1 could be associated to delayed development of pods..