The Effect of Salinity and Temperature on the Germination of Polymorphic Seeds and Growth of Atriplex triangularis Willd

Khan, M. Ajmal; Ungar, Irwin A.

doi:10.2307/2443323

Cited by 149 publications

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“…It might be because low temperature probably maintains dormancy in seeds during the winter and early spring. Similarly, Khan and Ungar (1984a) have recorded a high germination of A. triangularis at a moderate temperature as compared to low and alternating temperature. The maximum rate of germination in all polymorphic seeds of catchfly is recorded at 20 and 25 o C as compared to higher and lower temperatures.…”

Section: Effect Of Seeding Depthmentioning

confidence: 79%

Germination Ecology of Catchfly (Silene conoidea) Seeds of Different Colors

et al. 2017

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-Catchfly (Silene conoidea), an annual herb, is usually recognized as an emerging weed species in Eurasia and North America. The presence of somatic seed polymorphism might aid in the adaptation of this weed in different climatic conditions. We conducted laboratory and greenhouse experiments to study the seed polymorphism and influence of various environmental factors like temperature, salt stress, osmotic stress and burial depth on the germination and emergence characteristics of catchfly. Optimum germination of seeds of all colors was recorded at a temperature of 15 o C. Germination of catchfly seeds of all colors followed decreasing trend as NaCl concentration increased from 50 mM to 200 mM. Seed germination was maximum (87-96%) at 0 MPa but gradually decreased to 40% as osmotic stress increases up to -0.4 MPa and completely inhibited at 0.6 MPa of all seed colors. A slight increase (from 60 to 95%) in the germination of seeds of black and dark brown colors was observed when seeding depth increased from 0 to 2 cm but decreased when seeding depth increased from 2 to 4 cm in seeds of all colors. There was no emergence of catchfly at seeding depth of 6 cm or greater. Our results concluded that catchfly seeds have the potential to germinate and emerge in various environmental conditions, but germination/emergence percentage of seeds of all colors will be different in different environmental conditions. Soil amendments including deep ploughing may aid for the successful management of this weed in cultivated areas. Keywords

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Section: Effect Of Seeding Depthmentioning

confidence: 79%

Germination Ecology of Catchfly (Silene conoidea) Seeds of Different Colors

et al. 2017

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“…The germination rate was estimated according to the Eq. [1], modification of Timson's index (Khan & Ungar, 1984). The root and shoot lengths were measured and seedling vigour index was determined according to the Eq.…”

Section: Bacteria Strains and Growth Conditionsmentioning

confidence: 99%

Indole-3-acetic acid (IAA) producing Pseudomonas isolates inhibit seed germination and α-amylase activity in durum wheat (Triticum turgidum L.)

Tabatabaei

Ehsanzadeh

Etesami

et al. 2016

Span. j. agric. res.

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The role of plant-associated bacteria in plant physiology and metabolism is well documented, but little has been known about the roles played by Pseudomonas in durum wheat (Triticum turgidum L. var durum) growth and development. An in vitroexperiment was conducted to observe the effect of the inoculation of four indole-3-acetic acid (IAA)-producing Pseudomonas isolates and exogenous IAA on seed germination traits and α-amylase activity of durum wheat. The results showed inoculation with all bacterial isolates led to a decrease in the germination percent, although the extent of the depression varied with the isolate. A significant relationship between concentrations of bacterial IAA and the germination inhibition percent in durum wheat seeds by different bacteria strains was observed. The results of this assay showed the effect of bacterial isolates on α-amylase activity after six and 8 days of inoculation was significant, while effect of these isolates on α-amylase activity after two and 4 days of inoculation was not meaningful. In addition, the exogenously applied IAA displayed a concentration-dependent effect on seed germination attributes and α-amylase activity, consistent with the possibility that the inhibitory effect of bacterial inoculation on seed germination was in consequence of bacteria-produced IAA. Therefore, it may suggested that the inhibitory role of IAA in seed germination and α-amylase activity should be taken into account during the screening of IAA-producing Pseudomonas isolates for durum wheat growth promoting agents.

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“…Germination and emergence variability of alfalfa 137 The rate of germination (GR) was estimated using a modif ied Timson index of germination velocity (Khan and Ungar, 1984): GR = ΣG/t, where G is the percentage seed germination at one-day intervals and t is the total germination period.…”

Section: Laboratory Germinationmentioning

confidence: 99%

Germination and emergence variability of alfalfa (Medicago sativa L.) landraces collected in Southern Tunisia oases

Benabderrahim

Haddad

Hamza

et al. 1970

Span. j. agric. res.

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Alfalfa (Medicago sativa L.) is one of the most important forage crops in the world. It has been originated from the Caucasus region (Michaud et al., 1988). The species presents purple flowers, a tap root, an erect growth habit, coiled pods and no winter dormancy. This plant improves the yield and quality of the following crops by atmospheric nitrogen fixation (Bruulsema and Christie, 1987 AbstractVariability in germination under controlled conditions with and without salt, seeds characteristics and field emergence were evaluated for 20 landraces of Medicago sativa ssp sativa, a forage legume collected from three sites in Tunisia. Highly significant differences were recorded among the landraces (p < 0.001) for all the characters studied except tegument colour. Number of seeds produced per plant ranged between 378 and 460 seeds g -1 . Emergence responses of seeds were different among landraces and sites and their values ranged between 12 to 45%. Salt stress (150 mM) caused substantial reduction in final and rate of germination of all the landraces with an average decline of 62.4 and 69.7%, respectively. Final germination values ranged from 26.5 to 75.75% when supplied distilled water. However, final germination values ranged from 10.75 to 32.5% when the seeds were exposed to saline water (150 mM). Rate of germination ranged from 12.75 to 63.25% and from 6.25 to 21.25% at non-saline and salt stress, respectively. Cluster analysis separated the 20 landraces into four clusters. Three landraces in the first cluster had the lowest germination and the greatest field emergence. One landrace composed the second cluster and showed both high germination and field emergence. Two landraces in the third cluster presented greater germination and low emergence. The other landraces constituted the fourth cluster and had intermediates emergence and germination.Additional key words: arid land; diversity; salt stress; seeds. Resumen Variabilidad en la germinación y en la emergencia de variedades autóctonas de Medicago sativa en diferentes oasis de TúnezSe evaluó la germinación en laboratorio con y sin estrés salino, así como las características de las semillas y la emergencia de 20 poblaciones de la leguminosa forrajera Medicago sativa ssp sativa, procedentes de tres localidades de Túnez. Se observaron diferencias altamente significativas entre las poblaciones (p < 0,001) en todos los caracteres estudiados excepto en el color del tegumento. El número de semillas por gramo varió entre 378 y 460. La emergencia de las semillas fue diferente entre las poblaciones y las localidades (variaron entre el 12 y el 45%). El estrés salino (150 mM) causó una fuerte reducción en todas las poblaciones, tanto en la germinación final como en el porcentaje de germinación, con una reducción media del 62,4 y 69,7%, respectivamente. Los valores de germinación finales variaron entre 26,5 y 75,75% y entre 10,75 y 32,5% con agua destilada y estrés salino, respectivamente. El porcentaje de germinación varió desde el 12,75 al 63,25% y del 6,25 al 21,25% en ...

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The Effect of Salinity and Temperature on the Germination of Polymorphic Seeds and Growth of Atriplex triangularis Willd

Cited by 149 publications

References 0 publications

Germination Ecology of Catchfly (Silene conoidea) Seeds of Different Colors

Germination Ecology of Catchfly (Silene conoidea) Seeds of Different Colors

Indole-3-acetic acid (IAA) producing Pseudomonas isolates inhibit seed germination and α-amylase activity in durum wheat (Triticum turgidum L.)

Germination and emergence variability of alfalfa (Medicago sativa L.) landraces collected in Southern Tunisia oases

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