Is seed hydration memory dependent on climate? Testing this hypothesis with Mexican and Argentinian cacti species

Contreras-Quiroz, Mariana del Rocío; Pando-Moreno, Marisela; Jurado, Enrique; Flores, Joel; Bauk, Karen; Gurvich, Diego E.

doi:10.1016/j.jaridenv.2016.03.001

Cited by 24 publications

(23 citation statements)

References 11 publications

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“…Thus, initial differentiated development among the populations of the species is related to the environmental conditions to which the parental plants are subjected during the process of seed production (Baskin & Baskin ; Contreras‐Quiroz et al . ).…”

Section: Discussionmentioning

confidence: 97%

“…Sultan (2000) demonstrated that individuals can change their physiology according to environmental conditions and such responses to these conditions vary between different populations. Thus, initial differentiated development among the populations of the species is related to the environmental conditions to which the parental plants are subjected during the process of seed production (Baskin & Baskin 2014;Contreras-Quiroz et al 2016).…”

Section: Discussionmentioning

confidence: 99%

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Effects of seed hydration memory on initial growth under water deficit of cactus from two populations that occur in different ecosystems in Northeast Brazil

Lima

Meiado

2018

Plant Species Biology

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Discontinuity during the rehydration process of seeds that germinate in arid and semi‐arid ecosystems leads to the occurrence of hydration and dehydration cycles (HD cycles). HD cycles play an important role in the persistence and dynamics of plants in these ecosystems. Pilosocereus catingicola subsp. salvadorensis is a cactus that occurs in different ecosystems of northeast Brazil. This species is submitted to different environmental conditions, such as irregularity of soil water availability. This factor directly influences seed production, germination and establishment of new individuals in these ecosystems. The aim of this study was to evaluate the effects of HD cycles on the initial growth of P. catingicola subsp. salvadorensis seedlings from different ecosystems under water‐deficit conditions. Seeds collected in two different ecosystems were submitted to 0, 1, 2 and 3 HD cycles and seedlings from these seeds were submitted to water‐deficit treatments. HD cycles had effects not only during germination, but also in the initial growth and establishment of seedlings. Seeds from different populations had distinct responses to HD cycles and water‐deficit treatments. These effects, as acquisition of a greater tolerance of water deficit, were differentiated between populations of the same species that are established in different ecosystems. The effects of HD cycles interfere directly with seedling recruitment dynamics and the maintenance of these populations.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Effects of seed hydration memory on initial growth under water deficit of cactus from two populations that occur in different ecosystems in Northeast Brazil

Lima

Meiado

2018

Plant Species Biology

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“…According to Contreras-Quiroz et al (2016), the presence of hydration memory in the seeds of Cactaceae depends on the climate and the microenvironment where the cacti occur, indicating that environmental conditions imposed on the parental plants influence the germination responses of the cacti seeds when subjected to discontinuous hydration. Thus to test the theory proposed by Contreras-Quiroz et al (2016), two hypotheses were proposed in this study: (1) seeds of the same species collected from populations located in different ecosystems have a different germination response after passing through discontinuous hydration; (2) HD cycles provide greater tolerance to environmental stresses; however, the seed germination response is different between populations. The aim of this study was to determine the occurrence of hydration memory in seeds of two populations of P. catingicola subsp.…”

Section: Introductionmentioning

confidence: 99%

Discontinuous hydration alters seed germination under stress of two populations of cactus that occur in different ecosystems in Northeast Brazil

Lima

Meiado

2017

Seed Sci. Res.

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The water uptake by the seed in arid and semi-arid ecosystems may not be continuous, but may occur in hydration and dehydration cycles (HD). In order to investigate the benefits of discontinuous hydration on seed germination of Pilosocereus catingicola subsp. salvadorensis subjected to environmental stresses, an imbibition curve was determined and times X, Y and Z selected, corresponding to 25, 50 and 75% of the first phase of imbibition, respectively. Seeds of two populations (Caatinga and Restinga) were subjected to 0, 1, 2 and 3 HD cycles, with 48 h of dehydration. Water and saline stress responses were tested at five osmotic potentials (0.0, –0.1, –0.3, –0.6 and –0.9 MPa). Discontinuous hydration provided greater tolerance to water and saline stress in the seeds from the Caatinga region. When the seeds were subjected to water stress, the reduction of the mean germination time (MGT) provided by HD cycles decreased with increasing concentration of the solution. In saline stress, the reduction of MGT was greater in the solutions with the highest concentrations. We conclude that the seeds of the same species collected from populations located in different ecosystems have different germination responses after passage through discontinuous hydration and HD cycles. This provides greater tolerance to environmental stresses but with different responses among populations.

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“…In this present study, hydration times and numbers of HD cycles may had interfered negatively on M. atropurpureum seed germination. Contreras- Queiroz et al (2016) observed that the effects of HD cycles are related to the climate and the microenvironment where the parental individuals occur. Lima and Meiado (2017) demonstrated that seeds produced in different ecosystems present differentiated germinative responses after being submitted to the cycles of HD.…”

Section: Discussionmentioning

confidence: 99%

“…In studies with cactus species, Contreras-Queiroz et al (2016) observed that the presence of seed hydration memory, resulting of HD cycles, depends on the climate and the microenvironment where individuals occur, being then an indication that seed germination of some species is influenced by environmental conditions imposed to parental plants. Lima and Meiado (2017) demonstrated in experiments with seeds of Pilosocereus catingicola (Gürke) Byles & G.D. Rowley subsp.…”

Section: Http://cpsjournalorgmentioning

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 ...

show abstract

Is seed hydration memory dependent on climate? Testing this hypothesis with Mexican and Argentinian cacti species

Cited by 24 publications

References 11 publications

Effects of seed hydration memory on initial growth under water deficit of cactus from two populations that occur in different ecosystems in Northeast Brazil

Effects of seed hydration memory on initial growth under water deficit of cactus from two populations that occur in different ecosystems in Northeast Brazil

Discontinuous hydration alters seed germination under stress of two populations of cactus that occur in different ecosystems in Northeast Brazil

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

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