Ranunculus asiaticus L. is a quantitative long‐day (LD) flower species, originating from Mediterranean area. Cultivation of this crop for cut flowers has been rising during the last years. Flowering in ranunculus is a complex process, in which the thermal history of tuberous roots and the photoperiod play crucial roles. Specifically, cold treatments of tuberous roots anticipates sprouting and leaf rosette formation, and flowering. Similarly, LD anticipates flowering, but inhibiting the meristematic activity and reducing the number of flower stems. Based on literature, no information seems to be available for ranunculus about the hormonal balance at the different phenological phases, and on the influence of vernalisation on the hormones involved in flowering, and the effects of exogenous gibberellins is controversial. The aim of the experiment was to asses, in two hybrids of R. asiaticus, the influence of tuberous roots vernalisation on plant photosynthesis and photochemistry, gibberellic acid (GA3) and indoleacetic acid (IAA) biosynthesis, and flowering earliness and characteristics. Plants of the hybrids MDR (medium earliness) and MBO (early flowering) (Biancheri Creations, Italy), from rehydrated tuberous roots, were grown in climatic chamber at 18°C, under white fluorescent light (PPFD 170 mol m‐2 s‐1, 16 hours), in a mixture of perlite and peat (70:30 in vol.). In both the treatments, Control (only rehydration) and Vernalisation (exposure of rehydrated tuberous roots to 3,5 °C for 10 days), GA3 and IAA content was determined on tuberous roots at the sowing, and at the rosette stage. Light saturation curves of photosynthesis were determined at the rosette stage, while instantaneous photosynthetic rate and photochemistry, and chlorophyll content were measured at both vegetative and reproductive stages. Results provide a useful characterization of photosynthetic performance of ranunculus during plant development. Data on the influence of corm vernalisation on the hormonal profile in tuberous roots will help the comprehension on the process of flowering in this species. These information have physiological and practical value, as cultivation of ranunculus is increasing worldwide.

Photosynthesis in Ranunculus asiaticus L.: characterization in two Mediterranean hybrids under fluorescent white light / Modarelli, G. C.; Arena, C.; Carillo, P.; De Pascale, S.; Paradiso, R.. - (2018). (Intervento presentato al convegno XXX International Horticultural Congress tenutosi a Istanbul, Turkey nel 12 - 16 August 2018).

Photosynthesis in Ranunculus asiaticus L.: characterization in two Mediterranean hybrids under fluorescent white light

Modarelli G. C.;Arena C.;De Pascale S.;Paradiso R.
2018

Abstract

Ranunculus asiaticus L. is a quantitative long‐day (LD) flower species, originating from Mediterranean area. Cultivation of this crop for cut flowers has been rising during the last years. Flowering in ranunculus is a complex process, in which the thermal history of tuberous roots and the photoperiod play crucial roles. Specifically, cold treatments of tuberous roots anticipates sprouting and leaf rosette formation, and flowering. Similarly, LD anticipates flowering, but inhibiting the meristematic activity and reducing the number of flower stems. Based on literature, no information seems to be available for ranunculus about the hormonal balance at the different phenological phases, and on the influence of vernalisation on the hormones involved in flowering, and the effects of exogenous gibberellins is controversial. The aim of the experiment was to asses, in two hybrids of R. asiaticus, the influence of tuberous roots vernalisation on plant photosynthesis and photochemistry, gibberellic acid (GA3) and indoleacetic acid (IAA) biosynthesis, and flowering earliness and characteristics. Plants of the hybrids MDR (medium earliness) and MBO (early flowering) (Biancheri Creations, Italy), from rehydrated tuberous roots, were grown in climatic chamber at 18°C, under white fluorescent light (PPFD 170 mol m‐2 s‐1, 16 hours), in a mixture of perlite and peat (70:30 in vol.). In both the treatments, Control (only rehydration) and Vernalisation (exposure of rehydrated tuberous roots to 3,5 °C for 10 days), GA3 and IAA content was determined on tuberous roots at the sowing, and at the rosette stage. Light saturation curves of photosynthesis were determined at the rosette stage, while instantaneous photosynthetic rate and photochemistry, and chlorophyll content were measured at both vegetative and reproductive stages. Results provide a useful characterization of photosynthetic performance of ranunculus during plant development. Data on the influence of corm vernalisation on the hormonal profile in tuberous roots will help the comprehension on the process of flowering in this species. These information have physiological and practical value, as cultivation of ranunculus is increasing worldwide.
2018
Photosynthesis in Ranunculus asiaticus L.: characterization in two Mediterranean hybrids under fluorescent white light / Modarelli, G. C.; Arena, C.; Carillo, P.; De Pascale, S.; Paradiso, R.. - (2018). (Intervento presentato al convegno XXX International Horticultural Congress tenutosi a Istanbul, Turkey nel 12 - 16 August 2018).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/752498
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