Analysis of thermal dependence on the germination of braquiarão seeds using the thermal time model

Nakao, Evandro Afonso; Cardoso, Victor José Mendes

doi:10.1590/1519-6984.15714

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…The relationship of RGR with LWR was not significantly positive in plants of IT1, while in stressed plants it was highly significant (P≤0.001), probably explained by the lower development of DM in relation to leaf area. It is known that the optimum LAI is that which produces the maximum rate of dry matter; this is achieved when the crop intercepts virtually all the available radiation [ 36 ], and as a result the lowest leaves are still capable of maintaining a positive carbon balance [ 33 ]. NAR was determinant in the growth of plants in the early phenological stages, when the effect of self-shading did not influence photosynthesis.…”

Section: Discussionmentioning

confidence: 99%

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Effect of sowing date and water availability on growth of plants of chia (Salvia hispanica L) established in Chile

Silva¹,

Arriagada²,

Campos-Saez³

et al. 2018

PLoS ONE

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From 2010 to 2014 two trials were performed to assess the effect of sowing date (SD1, SD2) and irrigation treatments (IT1, IT2) on the growth of chia in central Chile, measuring leaf area (LA) and dry matter (DM) as primary parameters and relative growth rate (RGR), net assimilation rate (NAR), leaf weight ratio (LWR), crop growth rate (CGR) and specific leaf weight (SLW) as secondary parameters. Both LA and DM reached maximum values between 640 and 1150 accumulated degree days (ADD). However, LA and DM were 25% greater for sowing dates than for available water. Flowering date was also not affected by sowing date or water availability; plants flowered at 1140 and 942 ADD in SD1 and SD2 respectively, and at 499 ADD in the water availability trial. Sowing date had a significant effect on RGR 0.15 g g-1 d-1 for SD1 and 0.12 g g-1 d-1 for SD2 at 410 ADD. Greater water availability increased RGR by 60% compared to stressed plants, however NAR was similar between sowing dates with a tendency to greater values in SD2 plants; maximum values were recorded at 514 ADD in IT1 and IT2, with a tendency toward higher values in IT1. Thus, the primary growth variables LA, DM and flowering are genetically determined. However, the derived growth variables RGR, LWR, NAR, CGR and SLW were affected by sowing date and water availability, with significant differences at p≤ 0.05. The results showed that the sowing date and water availability influence significantly the growth parameters. The physiological component (NAR) show a strong influence on the growth rate of the chia (RGR), above the morphological component (SLW and LAR).

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Section: Discussionmentioning

confidence: 99%

“…Since temperature is a fundamental factor governing physiological changes in a crop, thermal time provides a quantitative estimate of those changes. This numerical approach has shown good results in the dynamic modeling of the growth and phenology of crops [ 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of sowing date and water availability on growth of plants of chia (Salvia hispanica L) established in Chile

Silva¹,

Arriagada²,

Campos-Saez³

et al. 2018

PLoS ONE

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“…Thermal time is the thermal sum accumulated per day that is necessary for the germination of 50% of the seed lot [18]. Temperature is one of the most important bioclimatic elements in determining the response of seeds to changing environmental conditions [19].…”

Section: Introductionmentioning

confidence: 99%

Thermal Time and Cardinal Temperatures for Germination of Cedrela odorata L.

Sampayo-Maldonado¹,

Ordoñez‐Salanueva²,

Mattana

et al. 2019

Forests

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Thermal time models are useful to determine the thermal and temporal requirements for seed germination. This information may be used as a criterion for species distribution in projected scenarios of climate change, especially in threatened species like red cedar. The objectives of this work were to determine the cardinal temperatures and thermal time for seeds of Cedrela odorata and to predict the effect of increasing temperature in two scenarios of climate change. Seeds were placed in germination chambers at constant temperatures ranging from 5 ± 2 to 45 ± 2 °C. Germination rate was analyzed in order to calculate cardinal temperatures and thermal time. The time required for germination of 50% of population was estimated for the current climate, as well as under the A2 and B2 scenarios for the year 2050. The results showed that base, optimal and maximal temperatures were −0.5 ± 0.09, 38 ± 1.6 and 53.3 ± 2.1 °C, respectively. Thermal time (θ1(50)) was 132.74 ± 2.60 °Cd, which in the current climate scenario accumulates after 5.5 days. Under the A2 scenario using the English model, this time is shortened to 4.5 days, while under scenario B2, the time is only 10 hours shorter than the current scenario. Under the German model, the accumulation of thermal time occurs 10 and 6.5 hours sooner than in the current climate under the A2 and B2 models, respectively. The seeds showed a wide range of temperatures for germination, and according to the climate change scenarios, the thermal time accumulates over a shorter period, accelerating the germination of seeds in the understory. This is the first report of a threshold model for C. odorata, one of the most important forest species in tropical environments.

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“…The thermal time value (Table 3) was substantially lower than that of other weeds, such as different species of Solanum (20,22) or tropical species such as Pennisetum typhoydes (44,70). This indicates a rapid germination response compared with those of other plant species.…”

Section: Discussionmentioning

confidence: 90%

Application of the thermal time model for different Typha domingensis populations

León

Cortijo

Izquierdo

et al. 2020

Preprint

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BackgroundTypha domingensis Pers. is a perennial emergent plant that in comparison to other Typha species, produces more biomass. This species is used in Green Floating Filters (GFFs), one of the most innovative systems of wastewater treatment to bioremediate eutrophic waters and produce biomass as biofuel feedstocks. The establishment of a GFF depends on the seed germination and plant responses under conditions of a new habitat. This study analysed the germination response of four different populations of T. domingensis through a thermal time model to determine which population would have the fastest germination for establishment in a GFF.ResultsSeeds from the Badajoz (Ba), Cuenca (Cu), Madrid (Ma) and Seville (Se) populations were exposed to different thermal regimes (constant and alternating temperatures between 15 and 30°C) and photoperiods (0, 3, 5, 7,10 and 20 days in darkness) to determine the parameters of the thermal model. Regardless of other parameters, no germination occurred in total darkness (20 days). The mean value of the base temperature (Tb) was 16.4±0.2°C in all treatments. The optimum temperature (To) values in Ma and Ba were 25°C, and those in Cu and Se were 22.5°C. The germination response decreased when the temperature approached Tb and increased when it was close to To. In comparison to temperatures with a ΔT= 5°C or 10°C, those with a ΔT= 15°C or ΔT= 0°C had the highest germination response and lowest thermal time (θT(50)). The photoperiod had a relationship with θT(50), but it was not proportional. The populations also affected germination; Cu had the highest values of To and germination response but had a lower θT(50). which coincides with the lowest mean ambient temperatures.Conclusion According to these results, the germination response of T. domingensis under optimal conditions was high in all populations but was affected to a greater or lesser extent depending on thermal regimes, photoperiods, and population. The thermal time model allowed us to determine that in comparison to other populations, Cu is the best population for establishment in a GFF due to its high germination response under the conditions tested.

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Analysis of thermal dependence on the germination of braquiarão seeds using the thermal time model

Cited by 8 publications

References 16 publications

Effect of sowing date and water availability on growth of plants of chia (Salvia hispanica L) established in Chile

Effect of sowing date and water availability on growth of plants of chia (Salvia hispanica L) established in Chile

Thermal Time and Cardinal Temperatures for Germination of Cedrela odorata L.

Application of the thermal time model for different Typha domingensis populations

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