Developmental responses of chia (Salvia hispanica) to variations in thermo-photoperiod: impact on subcomponents of grain yield
Jimena Pérez Brandán A , Ramiro N. Curti B and Martin M. Acreche
A C
+ Author Affiliations
- Author Affiliations
A EEA Salta, Instituto Nacional de Tecnología Agropecuaria, CONICET, Ruta Nacional 68, km 172, 4403 Salta, Argentina.
B Laboratorio de Investigaciones Botánicas (LABIBO), Facultad de Ciencias Naturales and Sede Regional Sur, Universidad Nacional de Salta-CONICET, Salta, Argentina.
C Corresponding author. Email: acreche.martin@inta.gob.ar
Crop and Pasture Science 71(2) 183-189 https://doi.org/10.1071/CP19218
Submitted: 28 May 2019 Accepted: 30 October 2019 Published: 10 February 2020
Abstract
Effect of thermo-photoperiod conditions on pre-flowering phasic development, number of unfolded leaves, verticillaster dry weight at flowering (VDWFL) and grain yield were evaluated for chia (Salvia hispanica L.). The objectives of this study were to: (i) characterise the pre-flowering response of chia to thermo-photoperiod conditions during and pre- and post-inductive subphases; and (ii) determine the relationships between the duration of pre-flowering subphases, the VDWFL and grain yield. Sowing-date experiments were conducted during three consecutive growing seasons with two chia genotypes under non-stressed conditions. Responses to thermo-photoperiod conditions were characterised by fitting a bi-linear model. All pre-flowering subphases showed a quantitative short-day response with a decrease in sensitivity to photoperiod in the later post-inductive subphase. The duration of the pre-inductive subphase was associated with the number of accumulated unfolded leaves, whereas the durations of the post-inductive subphases were not determined by the number of accumulated unfolded leaves. Higher VDWFL was achieved when durations of the pre-flowering subphases increased. In addition, increases in the VDWFL explained most of the variation in grain yield along the thermo-photoperiod conditions. Accordingly, this study suggests that developmental responses of chia and their relationships with VDWFL and grain yield should be taken into account for grain-yield improvement of this orphan crop.
Additional keywords: phenology, phyllochron, sowing date.
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