Water stress and temperature on germination and vigor of Handroanthus impetiginosus (Mart. ex DC)

Santos, Paulo C. S.; Benedito, Clarisse Pereira; Alves, Tatianne Raianne Costa; Paiva, Emanoela Pereira de; Sousa, Erivanessa C.; Freires, Afonso Luiz Almeida

doi:10.1590/1807-1929/agriambi.v22n5p349-354

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…The reduction of the osmotic potential induces low water absorption by the seed, negatively affecting the metabolic activity and reduces the degradation and translocation of reserves to the embryonic axis [18], combined with low respiratory activity due to the decrease in the input of oxygen due to the viscosity of PEG 6000 [19], which have directly affected the vigor presented by the first count and the germination speed index of C. spectabilis seeds. The low water absorption reduced the reactions during the germination metabolism, promoting the germination speed reduction and prolonging the seed germination process.…”

Section: Discussionmentioning

confidence: 99%

Physiological Response of Seeds of Crotalaria spectabilis under Drought and Heat Stress

Nóbrega

Silva

Bezerra

et al. 2022

Braz. arch. biol. technol.

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This study evaluate the effect of drought and heat stress on the quality of C. spectabilis seeds. A completely randomized design in a 4×4 factorial scheme, referring to four osmotic potentials based on Polyethylene glycol (PEG 6000 = 0.0, -0.2, -0.4 and -0.8 MPa) and four temperatures (25, 30 and 35 ºC constant and alternating between 25-35 ºC), with four replications of 50 seeds per plot was used. The germination percentage, first count germination, germination speed index, average germination time, average germination speed, length and dry mass of the root, shoot and seedlings were evaluated. C. spectabilis is sensitive to drought stress during germination and seedling establishment, tolerating up to -0.2 MPa. The physiological quality of seeds is reduced with the decrease of osmotic potentials. The temperature range between 25 and 30 ºC are the one that provide better conditions for the germination of the seeds of this species.

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Section: Discussionmentioning

confidence: 99%

Physiological Response of Seeds of Crotalaria spectabilis under Drought and Heat Stress

Nóbrega

Silva

Bezerra

et al. 2022

Braz. arch. biol. technol.

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“…(Sapindaceae) and Pinus nigra J.F.Arnold (Pinaceae) showed that these species, as well as M. atropurpureum, also germinate at low osmotic potentials , even though in a reduced percentage compared to the control. Santos et al (2018), evaluating Handroanthus impetiginosus (Mart. ex DC.)…”

Section: Discussionmentioning

confidence: 99%

Effect of hydration and dehydration cycles on Macroptilium atropurpureum seeds germination under water deficit conditions

Lima¹,

Oliveira²,

Meiado³

2018

Commun. Plant Sci.

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The imbibition process, which is essential for seed germination, can be interrupted due to lack of water in the environment. Once this occurs, seeds have its germination process interrupted and loses the water absorbed to the environment. The objective of this study was to evaluate the effects of hydration and dehydration cycles (HD cycles) on seed germination of Macroptilium atropurpureum under water deficit conditions. Seeds of M. atropurpureum were submitted to 0 (control), 1, 2 and 3 HD cycles at different hydration times. In addition, the seeds were also submitted to osmotic potentials of 0.0, -0.1, -0.3, -0.6 and -0.9 MPa for water deficit simulation. Although the seeds germinated in all of the osmotic potentials used, the seeds presented a reduction in the percentage of germination, independently of the number of HD cycles and the hydration time between each cycle. In addition, HD cycles also negatively affected the mean germination rate, promoting a reduction of this parameter as seeds were submitted to HD cycles and osmotic potentials. Thus, the results demonstrated that HD cycles did not provide an increase in water stress tolerance in M. atropurpureum seeds during germination. Highlighted Conclusions 1)Macroptilium atropurpureum seeds can germinate even in low osmotic potentials conditions. 2) Discontinuous hydration confers a negative effect on M. atropurpureum germination and does not provide a greater tolerance to water deficit.Seed imbibition is a key process in the plant life cycle determining whether seed germination and individual growth will be successful or not (Ribeiro et al. 2015). The imbibition process, which is essential for seed germination, can be interrupted due to lack of water in the environment. Once this occurs, the seed has its germination process interrupted and loses the water absorbed to the environment (Fenner and Thompson 2005). These interruptions during germination process occur in arid and semi-arid environments, where water presents a limit of space and time in its availability, subjecting seeds to hydration and dehydration cycles (HD cycles) (Lima and Meiado 2017). Dubrovsky (1998) pointed that discontinuous hydration ensures a high survival rate during desiccation, demonstrating that seeds may present seed hydration memory, caused by the discontinuous imbibition process.In addition to the high survival rate during desiccation highlighted by Dubrovsky (1998), HD cycles may provide other advantages during the germination process of the seeds of some species. Rito et al. (2009) demonstrated that seeds of Cereus jamacaru DC. subsp. jamacaru (Cactaceae) present seed hydration memory, since, after being submitted to HD cycles, seeds had their percentage of seed germination increased. Pedrero-López et al. (2016), in experiments with seeds of Dodonaea viscosa Jacq. (Sapindaceae) also observed a significant increase of germinability after HD cycles from 22.5% to 63.3%. Discontinuous hydration may also provide greater tolerance to abiotic stress conditions, as observed by Li et ...

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Abiotic stress on seed germination and plant growth of Zeyheria tuberculosa

et al. 2023

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Water stress and temperature on germination and vigor of Handroanthus impetiginosus (Mart. ex DC)

Cited by 6 publications

References 13 publications

Physiological Response of Seeds of Crotalaria spectabilis under Drought and Heat Stress

Physiological Response of Seeds of Crotalaria spectabilis under Drought and Heat Stress

Effect of hydration and dehydration cycles on Macroptilium atropurpureum seeds germination under water deficit conditions

Abiotic stress on seed germination and plant growth of Zeyheria tuberculosa

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