Role of putrescine in salt tolerance of Atropa belladonna plant

Ali, Refaat M.

doi:10.1016/s0168-9452(99)00227-7

Cited by 79 publications

(42 citation statements)

References 17 publications

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“…As reported in other plant species (Saker and Ei Ashal 1995;Ali 2000), NaCl additions in this study might induce osmotic stresses within plants and then inhibit plant growth. The continuous growth over time at the low NaCl levels (below 75 mM), but inhibition over time at the high NaCl levels (above 75 mM) suggests that a concentration of 75 mM is perhaps a threshold for NaCl to exert a detrimental effect on C. acuminata seedling growth.…”

Section: Discussionmentioning

confidence: 69%

Effect of NaCl on growth, morphology, and camptothecin accumulation in Camptotheca acuminata seedlings

and¹,

Liu²

2003

Can. J. Plant Sci.

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camptothecin accumulation in Camptotheca acuminata seedlings. Can. J. Plant Sci. 83: 931-938. NaCl salt is shown to increase alkaloid accumulation in some plant species, but creates an extensive problem in plant cultivation. The effect of NaCl on Camptotheca acuminata Decaisne growth, morphology, and camptothecin accumulation (concentration and yield) was studied in a hydroponic culture system. High NaCl levels (above 75 mM) in growth media significantly reduced plant height, weight, leaf number, and leaf length but increased leaf weight. In contrast, low NaCl levels (below 75 mM) only moderately reduced growth and affected morphology. Our results suggest a concentration of 75 mM is the threshold for NaCl to exert a detrimental effect on C. acuminata seedlings. Furthermore, high NaCl levels (above 75 mM) increased camptothecin concentrations both in leaves and roots, whereas low NaCl levels (below 75 mM) had no effect on camptothecin concentrations. However, total leaf camptothecin yield, the product of leaf camptothecin concentration and total leaf dry weight per seedling, decreased with increasing NaCl concentration. There was a negative relationship between plant growth and camptothecin concentration. Our results suggest that high NaCl salinity increases camptothecin concentration, but is not helpful to achieve a high camptothecin yield. Therefore, a salty growth environment should be avoided for camptothecin production. On sait que le sel (NaCl) accroît l'accumulation d'alcaloïdes chez certaines plantes, mais le sel nuit aussi à la culture. Les auteurs ont examiné les effets du sel sur la croissance de Camptotheca acuminata Decaisne, sur sa morphologie et sur l'accumulation de camptothécine (concentration et rendement) dans un système de culture hydroponique. Une forte concentration de sel (plus de 75 mM) dans le milieu diminue sensiblement la taille des plants, leur poids, ainsi que le nombre et la hauteur des feuilles, mais augmente le poids de ces dernières. Une faible concentration (moins de 75 mM), en revanche, ne diminue la croissance et ne modifie la morphologie que modérément. Les résultats indiquent que la concentration de 75 mM sert de seuil aux effets du sel sur les plantules de C. acuminata. Par ailleurs, une forte concentration de sel (plus de 75 mM) accroît la concentration de camptothécine dans les feuilles et les racines, tandis qu'une faible concentration (moins de 75 mM) n'a aucune incidence sur cette substance. Le rendement total des feuilles en camptothécine, soit la quantité de camptothécine dans les feuilles multipliée par le poids sec total des feuilles par plant, diminue quand la concentration de sel augmente. Il existe une corrélation négative entre la croissance de la plante et la concentration de camptothécine. Les résultats laissent croire qu'une forte salinité accroît la concentration de camptothécine, mais pas son rendement. Par conséquent, on évitera les milieux de croissance salins pour produire de la camptothécine.

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Section: Discussionmentioning

confidence: 69%

Effect of NaCl on growth, morphology, and camptothecin accumulation in Camptotheca acuminata seedlings

and¹,

Liu²

2003

Can. J. Plant Sci.

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“…Salt stress can perform preventive effects in many ways. It may interfere with seed germination by changing the water status of the seed so that water uptake is inhibited (Ali 2000). Our results showing the decrease in fresh weight and water content of the seedlings in saline medium may be explained by the failure of the roots to receive sufficient water due to the high osmotic pressure of medium (Al-Karaki 2001).…”

Section: Physiological and Cytogenetical Effects Of Exogenous Avle Inmentioning

confidence: 68%

The Effects of <i>Aloe vera</i> L. Leaf Extract on Some Physiological and Cytogenetical Parameters in <i>Allium cepa</i> L. Seeds Germinated under Salt Stress

2016

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SummaryThe present study was performed to evaluate the role of Aloe vera L. leaf extract (AvLE) on some physiological and cytogenetical parameters of Allium cepa L. seeds exposed to salinity. The radicle length of the seeds germinated in the medium with AvLE alone increased as compared with ones of the control seeds germinated in distilled water medium, while their radicle number and fresh weight reduced according to the control. In addition, the germination percentage of the mentioned seeds statistically was the same as the control seeds. Furthermore, the seeds germinated in the media containing 0.1 mg/L AvLE alone showed a significant increase of mitotic index, although they exhibited a higher number of chromosomal aberrations and micronucleus (MN) formation as compared with the seeds germinated in control conditions. On the other hand, salt stress considerably inhibited the seed germination and seedling growth of A. cepa. Moreover, salinity markedly decreased the mitotic index in root tip meristems of the seeds and increased the number of chromosomal aberrations. The negative effect of salt on the seed germination, seedling growth, mitotic activity and MN formation was alleviated in dramatically varying degrees by AvLE application. In contrast, the detrimental effects of salt on the chromosomal aberrations greatly increased with this treatment. Consequently, we reported that the application of AvLE alone induced chromosomal aberrations and MN formation, which are an indicator of genotoxicity, and had cytotoxic activity in normal conditions. However, the frequency of MN is greatly reduced in root tip cells of the seeds germinated in the medium containing 0.1 mg/L AvLE +0.15 M NaCl.

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“…The results also suggest that NaCl salinity inhibits seed germination and seedling growth of barley like in other seeds. The adverse effect of NaCl has been attributed to changes in osmotic potential resulting from reduced water (Bewley and Black 1994, Bradford 1995, Ali 2000. Phenyl urea pretreatment led to a marked increase in the percentage of germination and seedling growth under stressed conditions.…”

Section: Resultsmentioning

confidence: 99%

Response of salt stressed barley seedlings to phenylurea

Ali¹,

Abbas²

2003

Plant Soil Environ.

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The effect of phenylurea with reported cytokinin-like activities on seed germination, seedling growth, activities of antioxidant enzymes, polyphenol, peroxidase, indoleacetic acid oxidase, and total phenolic compounds, flavonoids was investigated in stressed barley seedlings. The application of phenylurea decreases the activity of peroxidase, indoleacetic acid oxidase and increases the activity of polyphenol oxidase with decrease in total phenolic compounds and flavonoids and consequent increase in growth rate. Saline (NaCl) stress in barley seedlings causes an increase in total phenolic compounds, flavonoids and enhancement of peroxidase and indoleacetic acid oxidase activities and consequent decrease in growth rate. The adverse effect of salt stress on germination, antioxidant enzymes, phenolic compounds, flavonoids can partially be rectified by phenylurea.Keywords: barley; phenylurea; salt stress; antioxidant enzymes; polyphenol oxidase; peroxidase; indoleacetic acid oxidase; phenolic compounds; flavonoids Environmental stresses are thought to result in the production of active oxygen in plant species, causing oxidative stress (Smirnoff 1993, Gossett et al. 1994, Hernandez et al. 1999). The ability of higher plants to scavenge the toxic active oxygen seems to be a very important determinant of their tolerance to environmental stress. The primary compounds of components of this antioxidant system include carotenoids, flavonoids, phenolic compounds as well as antioxidant enzymes such as catalase, peroxidase, polyphenol oxidase and indoleacetic acid oxidase.Phenolic compounds and flavonoids are among the most influential and widely distributed secondary products in the plant kingdom. Many of them play important physiological and ecological roles, being involved in resistance to different types of stress (Delalonde et al. 1996, Rice et al. 1998, Ayaz et al. 2000.Salinity stress can reduce cytokinin export from the root to the shoot in many plants (Rao and Rao 1985, Kuiper et al. 1988, 1990). An adequate cytokinin supply is essential for normal plant development; it can explain why exogenous applications of cytokinin can overcome the effect of salinity stress on the growth of wheat seedlings (Naqui et al. 1982, Roth 1987.In our study we used phenylurea because we believed that phenylurea application is likely to be a commercially viable way of reducing the effects of salinity stress compared with other synthetic cytokinins or kinetin. It is water soluble but it is little known about the response of phenylurea metabolism during stress. Therefore, the present study was undertaken to examine the effect of different levels of phenylurea on germination, seedling growth, phenolic compounds, flavonoids and antioxidant enzymes in barley grown under salinity stress. MATERIAL AND METHODSThe plant material was Hordeum vulgare L. (Giza 123 variety), an important crop grown in Egypt. Seeds were kindly supplied by the Egyptian Ministry of Agriculture. Selected seeds of uniform size were sterilised with 0.1% mercuric chl...

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Role of putrescine in salt tolerance of Atropa belladonna plant

Cited by 79 publications

References 17 publications

Effect of NaCl on growth, morphology, and camptothecin accumulation in Camptotheca acuminata seedlings

Effect of NaCl on growth, morphology, and camptothecin accumulation in Camptotheca acuminata seedlings

The Effects of <i>Aloe vera</i> L. Leaf Extract on Some Physiological and Cytogenetical Parameters in <i>Allium cepa</i> L. Seeds Germinated under Salt Stress

Response of salt stressed barley seedlings to phenylurea

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