Germination and recovery of heteromorphic seeds of Atriplex canescens (Amaranthaceae) under increasing salinity

Bhatt, Arvind; Santo, Andrea

doi:10.1007/s11258-016-0633-6

Cited by 54 publications

(35 citation statements)

References 43 publications

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“…In conclusion, our experiment allowed us to investigate the three chromatic seed categories observed for the first time in a desert population of L. platycarpa. Our results show the presence of seed heteromorphism in L. platycarpa, a phenomenon similar to whats previously been reported in Atriplex canescens (Bhatt and Santo 2016). Our study showed that variation in seed mass, final germination percentage and germination rate, as well as the requirements for light and temperature during germination are associated with seed coat colour in L. platycarpa.…”

Section: Discussionsupporting

confidence: 91%

“…Previous studies have reported that the mechanisms preventing seed germination include physiological factors inside the embryo, as well as developmental constraints and mechanical barriers in the fruit or seed coat, suggesting that this may be a widespread phenomenon in many plant species. The low germination of both olive green and brown seeds may imply that they contribute more to the soil seed bank that ensure the persistence of the species during periods with unfavorable climatic conditions that commonly occur in desert environments (El‐Keblawy et al 1997, Bhatt et al 2016a, b). The faster germination of orange seeds at lower and moderate temperatures would enable the seedlings to establish themselves early in the growing season, profiting quickly of the favourable conditions then prevailing.…”

Section: Discussionmentioning

confidence: 99%

“…In many species of desert environments variation in seed colour, size and weight is commonly reported (El-Keblawy et al 2013, Volis and Bohrer 2013, Bhatt and Santo 2016. Such variation may represent the outcome of both physiological, environmental and genetic factors (Dickson andBoettger 1982, Atak et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Effects of seed colour heterogeneity on germination behaviour of the desert plant Lotononis platycarpa (Fabaceae)

Gairola

Shabana

Mahmoud

et al. 2018

Nordic Journal of Botany

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We aimed to determine the ecological role of three seed morphs observed for the first time in a desert population of Lotononis platycarpa (Fabaceae), with respect to their germination requirements. Seeds sorted by seed coat colour (olive green, orange and brown) were germinated under laboratory conditions under two photoperiods (12/12‐h light and continuous dark) and three alternating temperature regimes (15/25, 20/30, 25/35°C). We found that the three distinct seed types differ in their seed mass, germination percentage and speed of germination. Overall, the light‐incubated seeds germinated with higher percentages than seeds in the total darkness. Furthermore, seeds with orange coat germinated with higher percentages at 15/25 and 25/35°C (up to 60%, for both) and significantly faster than the other two colour morphs. Our results suggest an adaptive significance of seed colour heterogeneity in the harsh desert habitat inhabited by the study species.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

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Effects of seed colour heterogeneity on germination behaviour of the desert plant Lotononis platycarpa (Fabaceae)

Gairola

Shabana

Mahmoud

et al. 2018

Nordic Journal of Botany

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“…to the same family, such as Atriplex canescens (Pursh) Nutt. (Bhatt and Santo 2016), also produce heteromorphic seeds. However, the pattern observed in the present study appears inconsistent with the higher germination of larger seeds, well documented in several previous studies.…”

Section: Discussionmentioning

confidence: 99%

Does perianth colour affect the seed germination of two desert shrubs under different storage periods and conditions?

Bhatt

Santo

2018

Nordic Journal of Botany

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Haloxylon salicornicum and Salsola vermiculata (Amaranthaceae) are two perennial shrubs producing fruits with differently coloured perianths (yellow vs pink) on separate individuals. To test the impact of different storage periods (four, eight and twelve months) and temperature conditions (freezing, room temperature and natural field temperatures) on the seed germination of the two seed categories, germination tests were carried out on both species. For both species, collected from wild plants in the Arabian desert (Qatar), seed germination was tested under two photoperiods (light 12/12; dark 24 hours) at 20/30°C for winged (intact) and de‐winged seeds. For each species, all the considered factors (perianth colour, wing presence, photoperiod, storage period and storage conditions) had significant effects on seed germination (p < 0.001), while the interactions among factors varied in their level of significance depending on the species. In both species, yellow seeds germinated considerably better than the pink ones, the presence of wings slowed the germination, and both storage period and temperature conditions highly influenced their germination ability. Our results indicate that seeds from different perianth colours have different germination strategies to delay their germination and distribute the species through time by escaping germination time by imposing some kind of after‐ripening or seed dormancy. The variation in storage time and storage conditions might help in extending their germination period, where one set of seeds germinate immediately, and the other set of seeds becomes dormant and thus contributes to the formation of a soil seed bank for the long‐term recruitment of seedlings. This study highlights an ecological advantageous strategy for these two species growing in the unpredictable desert habitat.

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“…; Minissale et al . ; Baskin & Baskin ; Bhatt & Santo ) or may be associated with the dormancy process. Temperature plays a major role in determining the periodicity of seed germination and the distribution of the species (Baskin & Baskin ).…”

Section: Introductionmentioning

confidence: 99%

Different ecological strategies during the seed germination phase of nine grasses inhabiting the hyper‐arid Arabian desert

Bhatt

Santo

2018

Plant Species Biology

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The effect of photoperiod, thermoperiod and their interaction on seed germination and its rate was studied for nine grasses growing in the Arabian desert. Germination tests were conducted under two photoperiods and three thermoperiods. Germination of light‐incubated seeds of Hyparrhenia hirta, Pennisetum divisum, Stipacapensis, Centropodia forsskaolii, Stipagrostis plumosa, Cymbopogon parkeri and Panicum turgidum was significantly higher than that detected in the darkness. Photoperiod did not influence the seed germination of Aristida adscensionis and Imperata cylindrica. Seeds of all species, except P. divisum, C. parkeri and I. cylindrica, germinated indepen dently of the tested temperature. Our results indicate that species belonging to the same family and growing in the same hyper‐arid desert habitat may influence and act in different ways during the seed germination phase, causing species‐specific effects, and therefore might affect the ecology of each taxon in this harsh environment.

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Germination and recovery of heteromorphic seeds of Atriplex canescens (Amaranthaceae) under increasing salinity

Cited by 54 publications

References 43 publications

Effects of seed colour heterogeneity on germination behaviour of the desert plant Lotononis platycarpa (Fabaceae)

Effects of seed colour heterogeneity on germination behaviour of the desert plant Lotononis platycarpa (Fabaceae)

Does perianth colour affect the seed germination of two desert shrubs under different storage periods and conditions?

Different ecological strategies during the seed germination phase of nine grasses inhabiting the hyper‐arid Arabian desert

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