Effect of reduced water potential on seed germination of a forest tree: a hydrotime approach

Daibes, L. Felipe; Cardoso, Victor José Mendes

doi:10.1590/2317-1545v42224519

Cited by 6 publications

(7 citation statements)

References 39 publications

(51 reference statements)

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“…The exposure of seeds of all species from all populations to decreasing water potential significantly reduced seed germination, in agreement with results reported for many species, including trees (Daws et al 2008;Baskin 2014, Daibes andCardoso 2020;Dantas et al 2020). Despite this, we established a rank order of tolerance to water stress: A. quebracho-blanco, P. praecox and T. stans…”

Section: Germination Response To Temperature and Water Potentialsupporting

confidence: 89%

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Variation in thermal and hydrotime requirements for seed germination of Chaco seasonally dry forest species in relation to population environmental conditions and seed mass

et al. 2022

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Thermal and hydrotime requirements for seed germination can vary with the species, environment in which the seeds developed and/or seed mass. We investigated seed germination responses to temperature and water potential of Aspidosperma quebracho-blanco, Bulnesia retama, Parasenegalia visco, Parkinsonia praecox and Tecoma stans, all of which are native tree species of Chaco seasonally dry forests in northwest Argentina. We determined inter-and intraspecific variability in seed germination through thermal and hydrotime models and correlated model parameters with environmental variables of seed provenance and seed mass. Seeds of all species germinated to high percentage over a range of temperatures. Seeds of A. quebracho-blanco, P. praecox and T. stans were more tolerant to water stress than those of B. retama and P. visco. Thermal and hydrotime parameters for germination varied amongst species and populations. There was a negative correlation between thermal (θ T(50) ) and hydrotime (θ H ) constants and base temperature (T b ) and water potential (Ψ b(50) ). Seed mass correlated negatively with T b and positively with θ T(50) . Species and populations were grouped according to thermal and hydrotime parameters and seed mass but not according to seed provenance. These results suggest that seed germination traits related to temperature, water potential and seed mass are species specific, and the variations within a species are probably due to a high phenotypic plasticity. These species showed a complex set of germination strategies that give them a competitive advantage in different environments, depending on dispersal time, seed mass and local environmental conditions during the germination period.

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Section: Germination Response To Temperature and Water Potentialsupporting

confidence: 89%

“…The exposure of seeds of all species from all populations to decreasing water potential significantly reduced seed germination, in agreement with results reported for many species, including trees (Daws et al . 2008; Baskin & Baskin 2014, Daibes and Cardoso 2020; Dantas et al . 2020).…”

Section: Discussionmentioning

confidence: 99%

Variation in thermal and hydrotime requirements for seed germination of Chaco seasonally dry forest species in relation to population environmental conditions and seed mass

et al. 2022

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“…The germination rate and germination percent of parthenium were highest at all water potentials and at a temperature of 20°C, which is supported by both measured and predicted values from the hydrothermal approach ( Figures 3 , 4 ). Thus, it shows the biological relevance of the model to describe the effects of water potential on germination ( Daibes and Cardoso, 2020 ).…”

Section: Resultsmentioning

confidence: 86%

“…Seeds germination is subjected to water availability ( Reed et al, 2022 ). For this purpose, the HT model is used for quantifying seed germination under different levels of water potential ( Bradford, 1990 ; Batlla and Benech-Arnold, 2015 ; Daibes and Cardoso, 2020 ). The HT concept is similar to the TT model, which is used to describe the germination time and rate on a quantification basis, and this model works in response to different levels of water potential in the germination medium.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the germination response of Parthenium hysterophorus at various temperatures and water potentials by using population-based threshold model

et al. 2022

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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.

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“…Valio and Scarpa (2001) proved that the seeds germination percentage and rate of seven tropical pioneer species in Brazil (Cecropia hololeuca, C. pachystachya, C. glazioui, Solanum gracillimum, S. granuloso-leprosum, S. tabacifolium and Miconia chamissois) were significantly higher in the irradiated condition than in shaded condition. On the other hand, seed germination rate of Peltophorum dubium varied with water potential treatment (Daibes & Cardoso 2020).…”

Section: Germinationmentioning

confidence: 96%

DEVELOPMENTAL MORPHO-ANATOMY AND GERMINATION OF THE SEEDS OF Pterocarpus indicus f. echinatus Willd. VARIANTS

Capiltan,

Maldia,

Quimado

et al. 2022

BIOTROPIA

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Previous studies on the embryo structure of legumes species had resulted in the division of the Fabaceae family into two great subfamilies based on embryo axis curvature. Research on seed morphology and anatomy adds to the knowledge of taxonomy, evolution and ecology. This study determined the seed developmental anatomy, pod and seed morphology as well as germination characteristics of the observed variants (T1 -small prickles; T2 -medium prickles; T3 -long prickles) of Pterocarpus indicus Willd. f. echinatus locally known as prickly narra in the Mount Makiling Forest Reserve (MMFR). Based on the anatomy of the root (radicle) and shoot apex, the formation of the leaf primordium in T2 seeds after radicle protrusion was more progressive. It was observed that the germination rate and the percentage were the highest in T2, where the apical dome was welldeveloped. The germination, pod and seed morphological characters as well as seed anatomical characters were proven to be systematically informative by showing significant differences among the variants.

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Effect of reduced water potential on seed germination of a forest tree: a hydrotime approach

Cited by 6 publications

References 39 publications

Variation in thermal and hydrotime requirements for seed germination of Chaco seasonally dry forest species in relation to population environmental conditions and seed mass

Variation in thermal and hydrotime requirements for seed germination of Chaco seasonally dry forest species in relation to population environmental conditions and seed mass

Quantifying the germination response of Parthenium hysterophorus at various temperatures and water potentials by using population-based threshold model

DEVELOPMENTAL MORPHO-ANATOMY AND GERMINATION OF THE SEEDS OF Pterocarpus indicus f. echinatus Willd. VARIANTS

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