Changes in Activities of Antioxidant Enzymes in Sunflower Leaves of Different Ages

Sairam, R. K.; Singh, Dharmendra; Srivastava, G. C.

doi:10.1023/a:1027328814591

Cited by 27 publications

(20 citation statements)

References 42 publications

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“…In soybean plants in our experiment a decrease in SOD activity was recorded, from 875.17 to 588.3 U g -1 fr.m. There are also reports suggesting both an increase in various antioxidant systems as well as a decrease in the activity of these enzymes, during senescence [21], pathogen invasion [22] or herbicide treatments [2]. Similar response was observed in weeds treated with herbicide formulation for Cat activites.…”

Section: Resultssupporting

confidence: 56%

Effects of linuron and dimethenamid on antioxidant systems in weeds associated with soybean

2008

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Changes in antioxidant systems in soybean and associated weeds (Ambrosia artemisiifolia L., Chenopodium album L., Convolvulus arvensis L and Sinapis arvensis L.) were studied in relation to treatment with herbicides linuron and dimethenamid in the field experiment. Differences in the total superoxide dismutase (SOD) and catalase (Cat) activities were observed in plants after application of herbicide formulation. Quantities of superoxide (O2.-) and hydroxyl (·OH) radicals and malonyldialdehyde (MDA), reduced glutathione (GSH) and total polyphenols content were also determined. In addition to this, potential antioxidant activity of the plant ethanolic extracts were assessed based on the scavenging activity of stable DPPH free radicals. Results obtained suggest that plants investigated 1) expressed different antioxidant systems in response to herbicide treatment; 2) enzymatic and non-enzymatic protective mechanisms were complementary; 3) some weed species showed distinctive and combined activity of several biochemical parameters, such as Ambrosia artemisiifolia.

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Section: Resultssupporting

confidence: 56%

Effects of linuron and dimethenamid on antioxidant systems in weeds associated with soybean

2008

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“…It has been shown that the activity of the antioxidant enzymes such as SOD, ascobate peroxidase (APO) and CAT are higher in young than in old leaves of sunflower while peroxidase showed lower activity in young than in old leaves (SAIRAM et al, 2003). This may explain the lack of activation of PG-POD in young leaves observed in this study.…”

Section: Resultsmentioning

confidence: 47%

Differential responses between mature and young leaves of sunflower plants to oxidative stress caused by water deficit

et al. 2010

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RESUMO Os efeitos do estresse hídrico e da reidratação nas trocas gasosas juntamente com alterações na lipoperoxidação e atividade da pirogalol peroxidase (PG-POD) foram estudados em folhas adultas e jovens de plantas de girassol (Helianthus annuus L.) cultivadas em casa de vegetação. O estresse hídrico reduziu a fotossíntese (P N ), a condutância estomática (g s ) e a transpiração (E) nas folhas adultas e jovens. No entanto, a amplitude da redução foi dependente da idade da folha. A concentração intercelular de CO 2 (C i ) aumentou nas folhas adultas, mas não apresentou alteração nas folhas jovens

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“…The mean of 4 readings per leaf from 3 leaves per treatment were measured. The membrane stability index (MIS) was calculated by the following equation (Sairam, 2003):…”

Section: Membrane Stability Indexmentioning

confidence: 99%

Defense enzyme activities and biochemical variations of Pelargonium zonale in response to nanosilver application and dark storage

Hatami¹,

Ghorbanpour²

2014

Turk J Biol

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IntroductionPelargonium zonale is one of the most important bedding ornamental plants, which is grown as a potted plant for its colorful, single or double showy flowers and attractive foliage. Leaf senescence and petal abscission are critical problems that break down cellular components and reduce the longevity and marketability values of many flowering plants (Serek et al., 1998). Moreover, leaf senescence is a complex molecular and physiological action that may result from several factors including phytohormones (e.g., abscisic acid and ethylene) and environmental stresses (e.g., temperature and darkness) (Weaver et al., 1998). Dark-induced senescence happens during commercial shipping and handling of Pelargonium species or other members of the family Geraniaceae (Reid et al., 2002). Many investigations suggested that the most important variations observed during plant senescence are chlorophyll degradation, increase in ethylene production, reduction in antioxidant enzyme activity, increase in reactive oxygen species (ROS) levels, and cell membrane damage (Prochazkova and Wilhelmova, 2007). This process has some similarities with natural senescence, which suggests that dark-induced cell death is a result of an active program that include the participation of signaling molecules, transcription factors, and catabolic enzymes (Buchanan-Wollaston et al., 2003). Plants are generally protected against this oxidative stresses by a wide range of radical scavenging systems such as antioxidative enzymes like superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxidase (APX), and catalase (CAT), as well as nonenzymatic compounds like carotenoids (Cameron and Reid, 2001;Zimmermann and Zentgraf, 2005). Therefore, any treatment that can help diminish ROS levels would be clearly advantageous in improving the plant performance and longevity.Several approaches using ethylene antagonists such as silver nitrate (AgNO 3 ), silver thiosulfate (STS), and 1-methylcyclopropene (1-MCP) have been investigated over the years for improving quality and longevity of ethylene-sensitive flowers (Serek and Trolle, 2000). However, STS and AgNO 3 are heavy metal pollutant substances and were not used commercially due to their

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Changes in Activities of Antioxidant Enzymes in Sunflower Leaves of Different Ages

Cited by 27 publications

References 42 publications

Effects of linuron and dimethenamid on antioxidant systems in weeds associated with soybean

Effects of linuron and dimethenamid on antioxidant systems in weeds associated with soybean

Differential responses between mature and young leaves of sunflower plants to oxidative stress caused by water deficit

Defense enzyme activities and biochemical variations of Pelargonium zonale in response to nanosilver application and dark storage

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