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Final germination percentage (A and B) and germination speed index (C and D) of Buchenavia tomentosa Eichler seeds without endocarp adhered at different incubation temperatures.
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Buchenavia tomentosa produces fruits with ecological function for Cerrado’s fauna. The aims of this paper were to quantify seed germination and behavior on thermal conditions and explain about water absorption of dispersal structure in B. tomentosa seeds. Ripe fruits were pulped, the endocarp removed, and seeds used in the germination tests at temp...
Contexts in source publication
Context 1
... temperature is still influenced by the final germination percentage; the regression model estimated 80% of germination at 19.7 °C and maximum percentage at 28.9 °C ( Figure 4A). Next to the T b and T max , at 15 and 40 °C, the final germination was smaller and differed significantly to the others temperatures ( Figure 4B). ...
Context 2
... temperature is still influenced by the final germination percentage; the regression model estimated 80% of germination at 19.7 °C and maximum percentage at 28.9 °C ( Figure 4A). Next to the T b and T max , at 15 and 40 °C, the final germination was smaller and differed significantly to the others temperatures ( Figure 4B). There was no germination at 10 and 45 °C. ...
Context 3
... highest GSI estimated by model occurred at 28.8 °C ( Figure 4C), with significant statistical reduction above or below 30 °C ( Figure 4D), similar to the value obtained in the optimum thermal condition for germination (29.24 °C). Although t 50 at 30 °C did not differed from 25 °C, when considering germination speed of 100% of the seed population, the differences between the same temperatures become significant. ...
Context 4
... highest GSI estimated by model occurred at 28.8 °C ( Figure 4C), with significant statistical reduction above or below 30 °C ( Figure 4D), similar to the value obtained in the optimum thermal condition for germination (29.24 °C). Although t 50 at 30 °C did not differed from 25 °C, when considering germination speed of 100% of the seed population, the differences between the same temperatures become significant. ...
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Citations
... The different values of growing degree hours at different temperatures are also an incentive for predicting the time of weed management through how much percentage of parthenium seeds would be able to germinate under different climatic conditions (Haji and Gonzalezandujar, 2009). These variations were occurred due to physiological changes in seeds during germination in changing temperatures (Jones et al., 2013;Correa et al., 2020) and these fluctuations were proved to be an imperative signal toward the germination and emergence pattern of parthenium in the field and ultimately toward the control strategies of parthenium weed at the proper time. Interactive effect of water potential and temperature on germination of Parthenium hysterophorus seed under controlled conditions. ...
... Generally, the ability of parthenium biotypes to germinate over a wide temperature range might allow them to overrun. Likewise, a much enhanced germination rate at higher day/night temperatures may promote its dissemination in the future as a result of climate change (Bajwa et al., 2018b;Correa et al., 2020). According to the findings of this study, a reduction in water potential led to a decline in germination rate. ...
Predicting the germination behavior of parthenium weed against different conditions of temperature and osmotic stress is helpful for studying the growth and development history of parthenium in different ecological contexts. Sustainable weed control strategies based on population-based threshold (PBT) models are profitable tools for crop planting date, herbicide application, and tillage operation time. To predict the emergence of parthenium by using thermal time (TT), hydrotime (HT), and hydrothermal time (HTT) analyses, seeds were exposed to varying constant temperatures (5, 10, 15, 20, 25, 30, 35, and 40°C) and water potentials (− 0.25, − 0.5, − 0.75, and − 1.0 MPa) under a controlled environment. Parthenium seeds showed better responses in terms of higher germination percentage and lower germination time at 20 and 25°C. The use of the germination modeling approach proposed the base temperature (7.2°C), optimum temperature (20°C), and ceiling temperature (42.8°C) for this weed. Moreover, germination behavior was also studied at different water potentials under different temperature regimes (10, 20, and 30°C). The HTT model predicted higher germination percentages (82.8 and 54.8%) of parthenium seeds at water potentials from 0 to −0.25 MPa, respectively, under a temperature of 20°C, and also identified a base water potential (Ψb(50) of − 0.54 MPa for germination. In conclusion, the use of the HTT modeling approach is helpful for predicting the emergence response of parthenium in a changing climate and ultimately supportive in time scheduling of parthenium weed management in cropping systems.
... Models have been used to study weeds (Soltani et al., 2016), cultivated species (Kamkar et al., 2012;Parmoon et al., 2015;Derakhshan et al., 2018) and native species (Cochrane et al., 2014;Mattana et al., 2018). In studies of Brazilian tree species of different biomes, such as Cerrado, Drymaria cordata (Cardoso and Pereira, 2009) and Buchenavia tomentosa (Correa et al., 2020); for Amazonian species (Daibes and Cardoso, 2018;Daibes et al., 2019) and for Caatinga species, such as Cenostigma microphyllum (Gomes et al., 2019) and Myracroduon urundeuva (Oliveira et al., 2019a), thermal models proved to be useful to elucidate ecological aspects of species survival and local adaptation. ...
Seed germination is regulated by temperature and can thus be quantified by thermal models, which can predict germination occurrence in biomes and plant survival under possible climate change scenarios. The objective of this study was to quantify germination based on thermal time and survival risk of 14 species in the Brazilian Cerrado in scenarios of future climate change. Seeds were collected in the warmer regions of the Cerrado, central Brazil, placed in incubators to germinate at constant temperatures of 10–50°C and evaluated every hour or day. Germination rate ( R 50 ), time for germination of 50% of the seeds ( T 50 ) and dent-like function were used to determine cardinal temperatures. Thermal time parameters were estimated using the Weibull model. Seed germination forecasts were made based on the International Panel on Climatic Change (IPCC) scenarios of global temperature increase. Base temperatures ( T b ) ranged from 3.5 to 16.5°C, maximum temperatures ( T max ) from 35 to 50°C and optimum temperatures ( T o ) from 30 to 35°C. Estimated thermal time varied from 484°C h to 400°C d at sub-optimal temperatures and 108°C h at 126°C d at supra-optimal temperatures. Species more distributed showed a higher thermal range of germination and are less susceptible to extinction in temperature increase scenarios. The results of this study suggest that seeds that are non-dormant after dispersal may be the most vulnerable in the future. In this context, our predictions contribute to understand how the survival of trees and shrubs will be affected in the Cerrado in the future.
A avaliação de sementes e plântulas em vias experimentais é uma importante fonte de conhecimentos úteis para a produção agrícola sustentável. Neste sentido este artigo tem como base a reunião e compilação de informação sobre os principais métodos de avaliação de experimentos com sementes, em relação à germinação e ao vigor. Para tal, foram enumerados pontos como a qualidade de sementes, protocolos experimentais e suas respectivas exemplificações. Assim, pode ser percebido que a utilização de outros testes e variáveis podem ser ligadas a experimentação com sementes, permitindo um uso melhor dos planos experimentais a fim de contribuir com uma melhor caracterização a este processo científico. A pesquisa com sementes pode ser melhor otimizada para que seus resultados possam ser entendidos e aplicados no ambiente agrícola com maior ênfase.
Erythrina velutina Willd. (Fabaceae) is a tree species that bears social, ecological, and economic importance for northeastern Brazil, a region with frequent temperature variations. The objective of this work was to evaluate the mobilization of reserves during seed germination and seedling establishment of E. velutina at different temperatures, and how these mechanisms are affected in a thermal-stress situation. The seeds germinated at 5, 15, 25, 35, and 45 °C, and the physiological and biochemical aspects of reserve mobilization (starch, lipids, and total proteins) were assessed during seedling establishment. Germination, vigor, and the mobilization of reserves from the cotyledons to the embryonic axis are affected according to the incubation temperature. The temperature of 25 °C favors the mobilization of reserves during seed germination and seedling establishment in E. velutina. In a situation of thermal stress, high temperatures affect the establishment of the seedlings, whereas low temperatures compromise the mobilization of reserves.
