Environmental factors and survival strategies of annual plant species in the Negev Desert, Israel

Gutterman, Yitzchak

doi:10.1046/j.1442-1984.2000.00032.x

Cited by 116 publications

(119 citation statements)

References 44 publications

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“…The germination of seeds after the acid scarification is in accordance with earlier reports (Gutterman, 1994). Impact of aging in combination of storage for more than 6-15 months has enhanced the germination percentage in desert plant taxa Sen, 1992b, 1992c;Gutterman, 2000). Germination percentage of these seeds got affected when placed under laboratory conditions.…”

Section: Discussionsupporting

confidence: 89%

Seed Germination of selected Taxa from Kachchh Desert, India

et al. 2010

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The district of Kachchh contains many culturally important plants. However, their conservation status is little known due to direct and indirect human activities. This study was undertaken with the aim of contributing to the conservation of the native species of these semi-arid regions through germination trials under laboratory conditions. Mature fruits of ten selected species were collected randomly from the known habitats to obtain viable seeds. These seeds were pre-treated with growth regulators singly or in combination after acid scarification or without scarification. Seeds were found to be dormant due to presence of thick seed coat or due to low level of endogenous hormonal level. Most of these seeds required different storage period to mature. Only seeds of Capparis cartilaginea germinated without treatment while the other species required treatments. Addition of growth regulators has enhanced seed germination in few taxa singly and in some plant cases in combination.

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Section: Discussionsupporting

confidence: 89%

Seed Germination of selected Taxa from Kachchh Desert, India

et al. 2010

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“…c . f. The larger mass of unit a and its greater adherence to soil or sand particles may promote settlement of seeds onto the soil surface, thereby preventing them from being dispersed by wind or insects away from the favourable microhabitat of the mother plant (Gutterman, 1994(Gutterman, , 2000. When bracteoles were removed from the dispersal units of C. arenarius, the mass of water taken up and rate of absorption and dehydration decreased significantly.…”

Section: Role Of Bracteoles In Dispersal and Germinationmentioning

confidence: 99%

Trade-offs between seed dispersal and dormancy in an amphi-basicarpic cold desert annual

Tan

Baskin

et al. 2013

Annals of Botany

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† Background and Aims Several studies have demonstrated trade-offs between depth of seed dormancy and dispersal ability for diaspore-dimorphic species. However, relatively little is known about trade-offs between these two life history traits for a species that produces more than two diaspore morphs. The aim of this study was to investigate the relationship between seed dormancy and dispersal in Ceratocarpus arenarius, an amphi-basicarpic cold desert annual that produces a continuum of dispersal unit morphs. † Methods A comparison was made of dispersal and dormancy breaking/germination responses of dispersal units from ground level (a), the middle of the plant canopy (c) and the top of the plant canopy (f ). Various features of the morphology and mass of dispersal units and fruits (utricles) were measured. The role of bracteoles in diaspore dispersal by wind, settlement onto the soil surface and dormancy/germination was determined by comparing responses of intact dispersal units and fruits. Movement of dispersal units by wind and animals, seed after-ripening, germination phenology and the presence of water-soluble germination inhibitors in bracteoles were tested using standard procedures. † Key Results Dispersal units a, c and f differed in morphology and mass; in the majority of cases, extremes were exhibited by a and f, with c being intermediate. Overall, relative dispersal ability was f . c . a, whereas relative intensity of dormancy was a . c . f. Bracteoles increased dispersal distance by wind, enhanced settlement of diaspores onto the soil surface and mechanically inhibited germination. † Conclusions The results provide evidence for a model in which there is a continuous inverse-linear relationship between diaspore dispersal ability and depth of dormancy. Thus, dispersal unit heteromorphism of C. arenarius results in a continuum, from no dispersal ability/high dormancy (dispersal unit a) to high dispersal ability/low dormancy (unit f ), which may be a bet-hedging strategy in the cold desert environment.

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“…Thus, a large and long-living soil seed bank may be retained for many years to come. Therefore, under such extreme and unpredictable desert conditions, the risk to the survival of such plant species is reduced, in particular in the most extreme desert areas (Gutterman, 1993(Gutterman, , 2000a(Gutterman, , 2001a(Gutterman, -c, 2002a). …”

Section: Discussionmentioning

confidence: 99%

“…Sometimes the whole spikelet is dispersed as a unit in which the upper and lower glumes cover the one to five caryopses, each enclosed by its upper and lower pale ( Fig. 1) (Evenari & Gutterman, 1976;Loria & Noy-Meir, 1979/ 80;Feinbrun-Dothan, 1986;Gutterman, 1993Gutterman, , 1994Gutterman, , 2000a2002a;Danin & Orshan, 1999).…”

Section: Introductionmentioning

confidence: 99%

Environmental factors and survival strategies of annual plant species in the Negev Desert, Israel

Cited by 116 publications

References 44 publications

Seed Germination of selected Taxa from Kachchh Desert, India

Seed Germination of selected Taxa from Kachchh Desert, India

Trade-offs between seed dispersal and dormancy in an amphi-basicarpic cold desert annual

The inhibitory effect of Negev Desert loess soil on the fast germinating caryopses of Schismus arabicus (Poaceae)

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