Sequential temperature control of multi-phasic dormancy release and germination of<i>Paeonia corsica</i>seeds

Porceddu, Marco; Mattana, Efisio; Pritchard, Hugh W.; Bacchetta, Gianluigi

doi:10.1093/jpe/rtv074

Cited by 23 publications

(32 citation statements)

References 37 publications

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“…In species in which the covering endosperm structure obstructs radicle protrusion through the seed coat, such as papaya, early germination occurs in two distinct physical phases (Porceddu et al , 2015). Initial tearing of the seed coat is followed by radicle protrusion through the endosperm.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical, biochemical, and morphological mechanisms of heat shock-mediated germination inCarica papayaseed

Webster

Waterworth

Stuppy

et al. 2016

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Section: Discussionmentioning

confidence: 99%

Biomechanical, biochemical, and morphological mechanisms of heat shock-mediated germination inCarica papayaseed

Webster

Waterworth

Stuppy

et al. 2016

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“…embryo growth, testa rupture, endosperm rupture – radicle emergence) including the epicotyl–plumule emergence event, were also identified for P. corsica seeds (Porceddu et al . ).…”

Section: Discussionmentioning

confidence: 97%

“…; Porceddu et al . ). Nevertheless, the role of gibberellins in dormancy release is controversial (Bewley ); although GA is associated with dormancy release and/or germination, in several species this treatment alone does not completely stimulate germination (Frattaroli et al .…”

Section: Introductionmentioning

confidence: 97%

Dissecting seed dormancy and germination in Aquilegia barbaricina, through thermal kinetics of embryo growth

et al. 2017

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Threshold-based thermal time models provide insight into the physiological switch from the dormant to the non-dormant germinating seed. This approach was used to quantify the different growth responses of the embryo of seeds purported to have morphophysiological dormancy (MPD) through the complex phases of dormancy release and germination. Aquilegia barbaricina seeds were incubated at constant temperatures (10-25 °C) and 25/10 °C, without pre-treatment, after warm+cold stratification (W+C) and GA treatment. Embryo growth was assessed and the time of testa and endosperm rupture scored. Base temperatures (T ) and thermal times for 50% (θ ) of embryo growth and seed germination were calculated. W+C enabled slow embryo growth. W+C and GA promoted rapid embryo growth and subsequent radicle emergence. The embryo internal growth base temperature (T ) was ca. 5 °C for W+C and GA -treated seeds. GA treatment also resulted in similar T estimates for radicle emergence. The thermal times for embryo growth (θ ) and germination (θ ) were four- to six-fold longer in the presence of GA compared to W+C. A. barbaricina is characterised by a multi-step seed germination. The slow embryo growth during W+C reflects continuation of the maternal programme of development, whilst the thermal kinetics of both embryo and radicle growth after the removal of physiological dormancy are distinctly different. The effects of W+C on the multiphasic germination response in MPD seeds are only partially mimicked by 250 mg·l GA . The thermal time approach could be a valid tool to model thermal kinetics of embryo growth and radicle protrusion.

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“…sandalioticum (hereafter R. sandalioticum ) are endospermic and contain a linear underdeveloped embryo ( sensu [ 42 ]). The seeds of these species show morphophysiological dormancy (MPD) [ 19 , 43 , 44 ]. Warm (25 °C for three months) followed by a cold stratification (5 °C for 3 months) release dormancy in A. barbaricina [ 19 ], while warm stratification (25 °C for three months) is required for dormancy break in seeds of P. corsica and R. sandalioticum [ 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

“…The seeds of these species show morphophysiological dormancy (MPD) [ 19 , 43 , 44 ]. Warm (25 °C for three months) followed by a cold stratification (5 °C for 3 months) release dormancy in A. barbaricina [ 19 ], while warm stratification (25 °C for three months) is required for dormancy break in seeds of P. corsica and R. sandalioticum [ 43 , 44 ]. Although these species were thoroughly studied under laboratory controlled conditions [ 19 , 43 , 44 ], how the seed germination kinetics of these species interact with their natural habitat (e.g., favourable environmental conditions for seed dormancy release, embryo growth, and radicle protrusion) needs to be investigated in order to supplement the limited knowledge present in the literature about the thermal control of MPD-type seeds.…”

Section: Introductionmentioning

confidence: 99%

Differential Interpretation of Mountain Temperatures by Endospermic Seeds of Three Endemic Species Impacts the Timing of In Situ Germination

Porceddu

Pritchard

Mattana

et al. 2020

Plants

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Predicting seed germination in the field is a critical part of anticipating the impact of climate change on the timing of wild species regeneration. We combined thermal time and soil heat sum models of seed germination for three endemic Mediterranean mountain species with endospermic seeds and morphophysiological dormancy: Aquilegia barbaricina, Paeonia corsica, and Ribes sandalioticum. Seeds were buried in the soil within the respective collection sites, both underneath and outside the tree canopy, and their growth was assessed regularly and related to soil temperatures and estimates of the thermal characteristics of the seeds. The thermal thresholds for embryo growth and seed germination of A. barbaricina assessed in previous studies under controlled conditions were used to calculate soil heat sum accumulation of this species in the field. Thermal thresholds of seed germination for P. corsica and R. sandalioticum were not previously known and were estimated for the first time in this field study, based on findings of previous works carried out under controlled conditions. Critical embryo length and maximum germination for A. barbaricina were reached in April, and in December for R. sandalioticum. Seeds of P. corsica stay dormant in the ground until the following summer, and the critical embryo length and highest germination were detected from September to December. Soil heat sum models predicted earlier germination by one month for all three species under two Intergovernmental Panel on Climate Change (IPCC) scenarios, based on the assumption that the estimated thermal thresholds will remain constant through climate changes. This phenological shift may increase the risk of mortality for young seedlings. The models developed provide important means of connecting the micro-environmental niche for in situ seed germination and the macro-environmental parameters under a global warming scenario.

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Sequential temperature control of multi-phasic dormancy release and germination ofPaeonia corsicaseeds

Cited by 23 publications

References 37 publications

Biomechanical, biochemical, and morphological mechanisms of heat shock-mediated germination inCarica papayaseed

Biomechanical, biochemical, and morphological mechanisms of heat shock-mediated germination inCarica papayaseed

Dissecting seed dormancy and germination in Aquilegia barbaricina, through thermal kinetics of embryo growth

Differential Interpretation of Mountain Temperatures by Endospermic Seeds of Three Endemic Species Impacts the Timing of In Situ Germination

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