Germination Response of Greasewood (Sarcobatus vermiculatus) to Temperature, Water Potential and Specific Ions

Romo, J. T.; Eddleman, Lee E.

doi:10.2307/3899252

Cited by 25 publications

(17 citation statements)

References 10 publications

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“…Percentage and rate of germination generally decreased with decreasing temperature and moisture availability, but some seeds were able to germinate even near environmental extremes. Germination percentage and rate at 25ЊC and Ϫ1.5 MPa were similar to those recorded for Sarcobatus vermiculatus (Romo and Edelman, 1985), a halophyte. At low water potentials (Ϫ1.0 to Ϫ1.5 MPa), percentage germination of A. australis var.…”

Section: Discussionsupporting

confidence: 78%

From flowering to dispersal: reproductive ecology of an endemic plant, Astragalus australis var. olympicus (Fabaceae)

Kaye

1999

American J of Botany

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Astragalus australis var. olympicus is an endemic plant of the Olympic Mountains, Washington. It is considered a Species of Concern by the U.S. Fish and Wildlife Service. This study focused on the reproductive biology of the plant from flower production through seed germination to identify possible weak points that might contribute to its rarity and impede its conservation. Most plants produced a large mean number of flowers and ovules (314.8 and 4106, respectively), but relatively few of these formed fruits and seeds (25.8 and 3.8%, respectively). In decreasing importance, ovules in fruits were lost to predation, seed abortion, and lack of fertilization. The percentages of these fates differed among sites and years. Excluding pollinators by bagging flowers reduced fruit set by ∼50%, but seed set per fruit and seed mass were unaffected. Germination was affected by scarification, temperature, and moisture availability. About 11% of seeds damaged by predispersal seed predators (weevil larvae) remained viable and were released from dormancy. I hypothesize that predispersal seed predation (over 80% at one site) has a negative effect on population growth. Conservation of this species could benefit from improved fruit set and decreased seed predation.

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Section: Discussionsupporting

confidence: 78%

From flowering to dispersal: reproductive ecology of an endemic plant, Astragalus australis var. olympicus (Fabaceae)

Kaye

1999

American J of Botany

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“…PEG was found to be less inhibitory to germination than iso-osmotic salt solutions, deviating from observations made with some halophytes (Romo andEddleman 1985, Katembe et al, 1998). This indicates a specific ion toxicity effect and emphasizes the non-halophytic characteristics of these species.…”

Section: Discussionsupporting

confidence: 52%

Responses of germination and radicle growth of two Populus species to water potential and salinity

Zhang

Runge

et al. 2006

For. Stud. China

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The effects of water potential, NaCl and Na 2 SO 4 on germination and radicle growth of two riparian tree species, Populus euphratica Oliv. and P. pruinosa Schrenk (Salicaceae), were tested. Growth chamber studies revealed an optimum temperature range for seed germination of both species between 15-35°C. The final germination percentage of both species decreases with decreasing water potential in all types of solution applied in the experiments. P. pruinosa was less tolerant to low Ψ W stress than P. euphratica, especially in salt solutions. Germination percentages fell below 20% for P. pruinosa at -0.6 MPa (NaCl) or -0.4 MPa (Na 2 SO 4 ) and for P. euphratica at -1.2 MPa (NaCl) or -0.6 MPa (Na 2 SO 4 ). Radicle growth of both species was inhibited by high concentrations of PEG, NaCl and Na 2 SO 4 . However, growth was enhanced at -0.13 and -0.29 MPa in PEG or at -0.13 MPa in NaCl solutions compared to distilled water. Radicle growth of P. euphratica was higher than that of P. pruinosa. Germination and radicle growth of both species exhibited ion toxicity. Na 2 SO 4 was more toxic than iso-osmotic solutions of NaCl. Radicle growth proved to be more sensitive than seed germination. Thus, flooding does not only yield the necessary soil moisture for germination but also favors seedling establishment of both species through leaching of salts from the soil surface. The different sensitivity of the species during their early growth stages might, moreover, contribute to the observed differences in their distribution in the Talim Basin (northwest China).

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“…When NaCl enters the seeds, it decreases the Ψ W in the seeds and promotes water uptake by them. Seeds that germinate better in NaCl than in isotonic PEG solutions have been reported for some other species (Sharma 1973;Romo and Eddleman 1985;Tobe et al 1999). The Ψ W of the NaCl solution that inhibited germination of both H. ammodendron and H. persicum was rather low compared with those that inhibit germination of many halophytic species (Partridge and Wilson 1987;Myers and Morgan 1989;Khan and Rizvi 1994;Khan and Ungar 1996;Ungar 1996).…”

Section: Discussionmentioning

confidence: 83%

Effects of sodium chloride on seed germination and growth of two Chinese desert shrubs, Haloxylon ammodendron and H. persicum (Chenopodiaceae)

Tobe

Li²,

Omasa³

2000

Aust. J. Bot.

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The effects of sodium chloride (NaCl), polyethylene glycol-6000, temperature and light on germination and the effects of NaCl on growth were investigated in two Chinese desert shrubs, Haloxylon ammodendron (C.A.Mey.) Bunge and H. persicum Bunge ex Boiss. et Buhse. Both species occur in non-saline sand dunes; H. ammodendron also occurs in saline land, although it is not dominant there. Percentage germination of H. ammodendron and H. persicum in -3.0 MPa (667 mmol kg -1 ) NaCl was 91 and 64%, respectively. Hydroponic culture of each species for c. 3 months with NaCl solutions of 0, 200, 400 and 600 mmol kg -1 showed that the survival of H. ammodendron was highest (82.3%) at 400 mmol kg -1 NaCl, while that of H. persicum decreased with increasing NaCl concentration and was low (11.1%) at 400 mmol kg -1 NaCl. Sodium concentration in shoot tissues of 99-day-old seedlings grown at 400 mmol kg -1 NaCl exceeded 1000 mmol kg -1 in both species, while Na concentration in non-transpiring young seedlings grown in 400 mmol kg -1 NaCl was 240 and 350 mmol kg -1 for H. ammodendron and H. persicum, respectively. The results indicate that both species have relatively low adaptability to salinity at the older seedling stage compared with that at the germination and young seedling stage, and that H. ammodendron shows higher adaptability to salinity at the older seedling stage than H. persicum. It was concluded that salinity adaptability in the later developmental stage of these species determines their distribution with respect to salinity.

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Germination Response of Greasewood (Sarcobatus vermiculatus) to Temperature, Water Potential and Specific Ions

Cited by 25 publications

References 10 publications

From flowering to dispersal: reproductive ecology of an endemic plant, Astragalus australis var. olympicus (Fabaceae)

From flowering to dispersal: reproductive ecology of an endemic plant, Astragalus australis var. olympicus (Fabaceae)

Responses of germination and radicle growth of two Populus species to water potential and salinity

Effects of sodium chloride on seed germination and growth of two Chinese desert shrubs, Haloxylon ammodendron and H. persicum (Chenopodiaceae)

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