Physiological and biochemical changes associated with cotton fibre development

Thaker, Vrinda S.; Rabadia, V. S.; Singh, Y. D.

doi:10.1007/s11738-999-0027-7

Cited by 13 publications

(14 citation statements)

References 14 publications

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“…In aquatic plants under P limitation, PAs may be released extracellularly into the i surrounding environment (Healey and Hendzel, 1979;Smith and Kalff, 1981;Lapointe et al, 1994), and / or may accumulate internally in both apoplastic and symplastic tissues (Jansson et al, 1988;Thaker et al, 1996). Alkaline PA activity has been inversely related to P availability in seagrasses as well as many other aquatic plants.…”

Section: Phosphorus Assimilationmentioning

confidence: 99%

“…Although acid PAs in terrestrial plants can be involved in important functions such as seed germination, secondary thickening of cell walls, and carbohydrate metabolism (Basra et al, 1989;Thaker et al, 1996), little is known about acid PAs and seagrasses (Table 4). In vitro acid PA activities have been used as an indicator of thermostability in Zostera marina and Z. noltii (Lutova and Feldman, 1981).…”

Section: Phosphorus Assimilationmentioning

confidence: 99%

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Review of nitrogen and phosphorus metabolism in seagrasses

Touchette

Burkholder

2000

Journal of Experimental Marine Biology and Ecology

329

232

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Within the past few decades, major losses of seagrass habitats in coastal waters impacted by cultural eutrophication have been documented worldwide. In confronting a pressing need to improve the management and protection of seagrass meadows, surprisingly little is known about the basic nutritional physiology of these critical habitat species, or the physiological mechanisms that control their responses to N and P gradients. The limited available evidence to date already has revealed, for some seagrass species such as the north temperate dominant Zostera marina, unusual responses to nutrient enrichment in comparison to other vascular plants. Seagrasses derive N and P from sediment pore water (especially ammonium) and the water column (most nitrate). The importance of leaves versus roots in nutrient acquisition depends, in part, on the enrichment conditions. For example, a shift from reliance on sediment pore water to increased reliance on the overlying water for N and P supplies has been observed under progressive water-column nutrient enrichment. Seagrasses may be N-limited in nutrient-poor waters with sandy or (less so) organic sediments, and P-limited in carbonate sediments. On the basis of data from few species, seagrasses enrichment (as low as 3.5-7 mM NO , 3-5 weeks), which is actively taken up without apparent 3 product feedback inhibition. Inhibition by elevated nitrate has also been reported, with description of the underlying physiological mechanisms, in certain macroalgae and microalgae. In Z. marina, this effect has been related to the high, sustained energy demands of nitrate uptake, and to inducement of internal carbon limitation by the concomitant 'carbon drain' into amino acid assimilation. In contrast, nitrate enrichment can stimulate growth of Z. marina when the sediment, rather than the water column, is the source. Because seagrass species have shown considerable variation in nutritional response, inferences about one well-studied species, from one geographic location, should not be applied a priori to that species in other regions or to seagrasses in general.Most of the available information has been obtained from study of a few species, and the basic nutritional physiology of many seagrasses remains to be examined and compared across geographic regions. Nonetheless, the relatively recent gains in general understanding about the physiological responses of some seagrass species to nutrient gradients already have proven valuable in both basic and applied research. For example, physiological variables such as tissue C:N:P content have begun to be developed as integrative indicators of nutrient conditions and anthropogenic nutrient enrichment. To strengthen insights for management strategies to optimize seagrass survival in coastal waters adjacent to exponential human population growth and associated nutrient inputs, additional emphasis is critically needed to assess the role of variable interactions-among inorganic as well as organic N, P and C, environmental factors such as temperature, ...

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Section: Phosphorus Assimilationmentioning

confidence: 99%

Section: Phosphorus Assimilationmentioning

confidence: 99%

Review of nitrogen and phosphorus metabolism in seagrasses

Touchette

Burkholder

2000

Journal of Experimental Marine Biology and Ecology

329

232

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“…Substrate was the same as for acid phosphatase and reaction was measured at 405 nm (Thaker et al 1996).…”

Section: Methodsmentioning

confidence: 99%

Activity of some enzymes in barley caryopses during imbibition in aluminium presence

Šimonovičová¹,

Tamás²,

Huttová³

et al. 2004

PLANT SOIL ENVIRON

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Peroxidase, superoxide dismutase, acid and alkaline phosphatase, esterase and glucosidase activities were studied during imbibition of barley caryopses in the presence of aluminium. Antioxidative enzymes (peroxidase, superoxid dismutase) showed elevated activity already 2 h a�er the onset of imbibition in the presence of Al. In contrast hydrolytic enzymes (phosphatases, glucosidase, esterase) were only moderately activated at low Al concentrations (1-2mM), while strong inhibition was observed at higher Al concentrations (4-8mM). In in vitro conditions 8mM Al had no effect on the activity of acid phosphatase, moderately inhibited alkaline phosphatase and glucosidase and strongly esterase activity. During imbibition of caryopses in solution without Al an increase of the pH value of the imbibition solution from 4 to 6 has occurred, while in the presence of Al the shi� in pH value was less expressive and dependent on Al concentration. At 8mM Al concentration no change in the pH value of imbibition solution was observed. The SDS-PAGE analysis of polypeptides released to the imbibition solution in the presence of Al revealed the accumulation of two polypeptides with relative molecular mass of 35 and 18 kDa. The release of 96 and 27.5 kDa polypeptides was completely inhibited at 8mM Al concentration. These results confirmed that Al is able to influence different physiological processes already during seed imbibition and early growth phases of barley seedlings.

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“…The method of Thaker et al (1996) was followed for the estimation of acid phosphatase activity. The reaction mixture consisted of 75 mM sodium acetate buffer (pH 4.2), 5 mM p-nitrophenylphosphate (in buffer), and the enzymatic solution.…”

Section: Acid Phosphatase Assaymentioning

confidence: 99%

“…Acid phosphatases are a group of enzymes that nonspecifically catalyze the hydrolysis of a variety of phosphate esters and are widely distributed in nature. They have been extensively studied in a number of plant systems (Kaneko et al 1990, Thaker et al 1996) and have considerable diversity with regard to their physical properties.…”

mentioning

confidence: 99%

Biochemical Changes Associated With Brassica juncea Seed Development. IV. Acid and Alkaline Phosphatases

Saroop

Chanda

Singh

1999

J Plant Growth Regul

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Changes in acid and alkaline phosphatase activities in cytoplasmic and wall-bound fractions of developing mustard (Brassica juncea) seed were studied. Growth was measured by seed dry weight and water content. Seed dry weight data were fitted to a cubic polynomial equation. Seed water content and dry matter accumulation was significantly correlated. Cytoplasmic acid and alkaline phosphatase activities were substantially less in the cytoplasmic fraction than the wall-bound fraction. Wall-bound acid phosphatase activity was low initially, but high levels were maintained after day 25, indicating a relationship with dry matter accumulation. The results suggest that acid phosphatase plays an important role during mustard seed development.

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Physiological and biochemical changes associated with cotton fibre development

Cited by 13 publications

References 14 publications

Review of nitrogen and phosphorus metabolism in seagrasses

Review of nitrogen and phosphorus metabolism in seagrasses

Activity of some enzymes in barley caryopses during imbibition in aluminium presence

Biochemical Changes Associated With Brassica juncea Seed Development. IV. Acid and Alkaline Phosphatases

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