Intermediate complex morphophysiological dormancy in seeds of the cold desert sand dune geophyte Eremurus anisopterus (Xanthorrhoeaceae; Liliaceae s.l.)

Mamut, Jannathan; Tan, Dunyan; Baskin, Carol C.; Baskin, Jerry M.

doi:10.1093/aob/mcu164

Cited by 17 publications

(12 citation statements)

References 22 publications

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“…Embryos with simple level of MPD grows at temperatures suitable for WS (>15C), while in case of complex level of MPD the embryo grows at low temperatures (0-10C) suitable for CS [7]. Seeds with intermediate PD can after-ripen to some degree, which results in a decrease in the length of the cold stratification period required to break PD [11][12][13]. Also, in case of intermediate level of MPD only cold stratification requires to break MPD of the embryo and applying of GA 3 may substitute for CS in these seeds.…”

Section: Resultsmentioning

confidence: 99%

Seed germination of Paederotella pontica (Rupr. ex Boiss.) Kem-Nath.- rare endemic species of the Caucasus

Shakarishvili

2020

BIO Web Conf.

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Paederotella pontica is a Colchis tertiary relict species, regional narrow endemic to the Caucasus, representative of an oligotypic genus. The aim of this study was to determine dormancy-breaking requirements and develop seed germination protocol for P. pontica. Freshly matured seeds of P. pontica are morphophysiologically dormant (MPD). Mean length of seed is 820 μm, linear embryo is fully differentiated, on average 625 μm long. Penetration of tetrazolium salt indicates the permeability of seed coat and high percentage of vital seeds in capsules. Prior to root emergence, the E:S ratio increased from 0.76 to 0.9. Effects of warm and cold stratification and gibberellic acid (GA3) on embryo growth and seed germination were studied under laboratory conditions. Since cold stratification is the only requirement for the loss of MPD, the longest embryo growth occurred during this treatment and GA3 promoted MPD loss, we concluded that P. pontica seeds have intermediate complex MPD. Based on the treatment results a germination protocol is proposed: 1. Dry storage at 20°C, 2 months; 2. Cold-wet stratification at 3°C, 3 months; 3. Germination at 20/15°C day/night. Under developed conditions germination is fast, synchronous and yields to 80%.

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Section: Resultsmentioning

confidence: 99%

Seed germination of Paederotella pontica (Rupr. ex Boiss.) Kem-Nath.- rare endemic species of the Caucasus

Shakarishvili

2020

BIO Web Conf.

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“…Perennials do not have to form soil seed banks in order for the population to persist, because the perennial plant itself is ‘more or less’ the ‘seed bank’. The cold desert perennials Ixiolirion tataricum , Tulipa iliensis (Tang et al, 2009), Crocus alatavicus (Fu et al, 2013) and Eremurus anisopterus (Mamut et al, 2014b) also do not form a persistent soil seed bank.…”

Section: Discussionmentioning

confidence: 99%

“…Although herbaceous perennials are an important component of the cold desert vegetation of Central Asia (Tang et al, 2009; Sharma and Sharma; 2010; Baskin and Baskin, 2014), their seed germination ecophysiology has received relatively little research attention (Tang et al, 2009; Fu et al, 2013; Mamut et al, 2014b). On the other hand, much research has been done on the germination of cold desert annuals of Central Asia (Sun et al, 2009; Lu et al, 2010, 2015; Ma et al, 2010; Tang et al, 2010; Wang et al, 2010a; Mamut et al, 2014a; Zhou et al, 2015; Chen et al, 2019a,b).…”

Section: Introductionmentioning

confidence: 99%

Versatility in the timing of seed germination of the cold desert herbaceous perennialLeontice incerta(Berberidaceae)

et al. 2020

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AbstractOnly a few studies have been performed on seed germination of perennial ephemeral species native to the cold deserts of central Asia. We hypothesized that seeds of the cold desert perennial ephemeral Leontice incerta exhibit versatility in the timing of germination, that is, having the capacity to germinate at any time in summer, autumn and next spring. At dispersal in late May, only about 30% of the seeds could germinate; thus, a high percentage of the seeds was dormant. Seeds had a fully developed embryo, and dry storage, cold stratification, warm stratification and gibberellin promoted germination; we concluded that they have non-deep physiological dormancy. Seeds buried under natural conditions during summer germinated to 57–86% in autumn (late October) when exhumed and incubated at 5/2–25/15°C. However, seeds were sown in soil exposed to natural temperature and (low) precipitation did not germinate until next spring when the soil was moist. Thus, like various cold desert annuals, seeds of the perennial L. incerta can germinate in summer, autumn and next spring, depending on the availability of soil moisture (rainfall). Rainfall in cold deserts can play an important role in shaping seed germination traits of desert plants.

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“…Light inhibits germination in seeds of many geophytes from relatively dry habitats (e.g. Allium staticiforme , Thanos et al , 1991; Muscari weissii and M. neglectum , Doussi and Thanos, 2002; Leucojum autumnale , Narcissus cavanillesii , Narcissus serotinus , Scilla autumnalis and Urginea maritima , Marques and Draper, 2012; Eremurus anisopterus , Mamut et al , 2014). It is well established that photoinhibition may be ecologically advantageous for species growing in dry habitats, by ensuring below-surface germination and hence protecting seedlings from dehydration and exposure to extremely high temperatures (Koller et al , 1964; Thanos et al , 1991).…”

Section: Discussionmentioning

confidence: 99%

Seed afterripening and germination photoinhibition in the genusCrocus(Iridaceae)

Skourti

Thanos

2015

Seed Sci. Res.

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Mediterranean characteristics are attributed to the genusCrocus, which is inadequately studied in terms of seed germination. An afterripening requirement is very common in environments with warm and dry periods, and photoinhibition has been detected in many angiosperms inhabiting dry and open areas. The effects of afterripening and light on seed germination were investigated for the first time in 23 native GreekCrocustaxa, collected from various localities with either a Mediterranean or a temperate climate. Germination experiments were conducted in continuous darkness and in light at the optimal temperature for each taxon, with both freshly collected and afterripened seeds; warm stratification (20°C, darkness) was also examined in 22 taxa. A number of selected taxa were additionally investigated with respect to afterripening outdoors, afterripening and warm stratification at higher temperatures (35 and 25°C, respectively), stratification at 20/10°C, dry storage at low temperatures, response to gibberellic acid and phenology of embryo growth. It was postulated that an afterripening requirement is a characteristic of the genusCrocus, and we found that it can be fulfilled in nature during the Mediterranean dry summer. Also, for the vast majority of the taxa, warm stratification and stratification at 20/10°C can both meet the afterripening requirement. Embryos of the taxa studied are underdeveloped and have to grow prior to germination. Intrageneric differences of seed germination were observed only towards light, with photoinhibition being predominant in taxa from drier environments.

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Intermediate complex morphophysiological dormancy in seeds of the cold desert sand dune geophyte Eremurus anisopterus (Xanthorrhoeaceae; Liliaceae s.l.)

Cited by 17 publications

References 22 publications

Seed germination of Paederotella pontica (Rupr. ex Boiss.) Kem-Nath.- rare endemic species of the Caucasus

Seed germination of Paederotella pontica (Rupr. ex Boiss.) Kem-Nath.- rare endemic species of the Caucasus

Versatility in the timing of seed germination of the cold desert herbaceous perennialLeontice incerta(Berberidaceae)

Seed afterripening and germination photoinhibition in the genusCrocus(Iridaceae)

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