Salt uptake and shoot water relations in mangroves

Paliyavuth, Chanita; Clough, Barry; Patanaponpaiboon, Pipat

doi:10.1016/j.aquabot.2004.01.002

Cited by 56 publications

(41 citation statements)

References 20 publications

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“…Similar results have been obtained in A. marina (Downton, 1982) and other halophytes (Marcum and Murdoch, 1992;Paliyavuth et al, 2004). Nitrate, phosphate, sulfate and oxalate remained relatively constant with salinity (Table 1).…”

Section: Leaf Ion Concentrationsupporting

confidence: 85%

“…Similar Na + /K + ratios (7-25) were measured in mature leaves of mangrove species grown under controlled and natural conditions at lower salinity levels (Atkinson et al, 1967;Clough, 1984;Ball, 1988;Paliyavuth et al, 2004;Parida et al, 2004). Potassiumsodium selective ratios (S K,Na ), computed from K + plant / Na + plant ÷ K + water /Na + water (Pitman, 1977), for plants growing in presence of salt ranged from 4.5 to 16.5 and were similar to the values reported for other mangrove species (Dowton, 1982;Clough, 1984;Paliyavuth, 2004). The capability of A. germinans to take up K + efficiently even in high-salinity environments may be regulated by the K + transporter (Trk/ HKT) family (Gierth and Mäser, 2007).…”

Section: Salinity Effects On Ion Composition and Salt Secretion Rate supporting

confidence: 60%

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Salinity effects on leaf ion composition and salt secretion rate in Avicennia germinans (L.) L.

Suárez

Medina

2008

Braz. J. Plant Physiol.

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The effect of salinity on leaf water relations, and rate and ionic composition of leaf secretion was investigated in plants of Avicennia germinans growing under controlled salinity conditions. Increases in salinity from 0 to 940 mol NaCl m -3 reduced the predawn water potential from -0.56 to -4.16 MPa and the solute potential from -2.27 to -4.48 MPa, whereas the pressure potential remained positive in all treatments. Compared to the control, at 940 mol NaCl m -3 Na + and Cl -concentrations of leaf sap increased 19 and 7 times, respectively. With the addition of salt the main ions accumulated in leaves were Na + and Cl -whereas plants grown without salt accumulated K + in leaves at levels similar to those of Na + with salt treatments. Secretion rates of Na + and Cl -ions increased up to the highest salinity treatment, amounting to 59 and 46 times respectively, compared to control plants. The increase in secretion rate contributed to counteract the increase of salt concentration in the leaf. In the treatments receiving salts, the Na + /K + ratio of leaf sap ranged from 4 to 10, whereas that of the secretion ranged from 24 to 56. The ratio of Cl -vs the rest of anions remained around 3 in the leaf sap of salt-treated plants whereas it varied between 96 and 243 in the secretion. With increasing salinity higher secretion rates maintained the internal ion leaf concentration relatively low. The selective character of the secretion contributes to maintain favourable Na + /K + and Cl -/anion ratios in the leaf cells.

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Section: Leaf Ion Concentrationsupporting

confidence: 85%

Section: Salinity Effects On Ion Composition and Salt Secretion Rate supporting

confidence: 60%

Salinity effects on leaf ion composition and salt secretion rate in Avicennia germinans (L.) L.

Suárez

Medina

2008

Braz. J. Plant Physiol.

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“…This variation may represent species-specific accumulation of salt in their leaves. Additionally, as a salt accumulator, X. granatum (Paliyavuth et al 2004) may expel excess salt by dropping leaves (Munns 1992), which is also supported by the results from our leaf demography study.…”

Section: Iforest -Biogeosciences and Forestrysupporting

confidence: 75%

“…Seed germination is greater in less saline conditions (approximately 60%) than in high saline conditions (approximately 20% - Mahmood et al 2014a). Xylocarpus granatum is considered to be a salt accumulating species (Paliyavuth et al 2004) and occurs in association with H. fomes, Avicennia officinalis or Brugeira gymnorrhiza. Xylocarpus granatum covers 3.09% of the total vegetated area of the Sundarbans, which declined at a rate of 0.10% year -1 during the 1926-1997 period (Iftekhar & Saenger 2008).…”

Section: Introductionmentioning

confidence: 99%

Salinity strongly drives the survival, growth, leaf demography, and nutrient partitioning in seedlings of Xylocarpus granatum J. König

Siddique¹,

Saha²,

Salekin³

et al. 2017

iForest

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Salinity is increasing in the Sundarbans (Bangladesh) due to sea-level rise and the reduction of fresh water flow. Xylocarpus granatum is one of the most valuable mangrove tree species of the Sundarbans. We conducted a six-month long study to investigate the effect of salinity on the survival, growth, leaf demography, and nutrient partitioning in parts of X. granatum seedlings. Our results showed that most of the seedlings (90%) survived at 0 to 5 PSU salinity, and this survival percentage was found to decrease at higher saline conditions. Salinity of more than 25 PSU was lethal to the plants as no seedlings survived under these conditions. In this salinity (25 PSU), accelerated leaf fall coupled with a reduction in the new leaves caused loss of leaves. The relative growth rate (RGR) was higher at 0 to 5 PSU salinity, and conversely, a lower growth rate was observed with increased salinity. Higher saline conditions created stress, which inhibited nutrient (N, P and K) accumulation in different parts (leaf, stem, bark and root) of the seedlings. We concluded that salinity is a critical factor for the growth and survival of X. granatum either by inhibiting plant nutrient uptake or due to salinity related toxicity.

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“…Mangroves grow in the intertidal zone between land and sea. They are frequently inundated by tide leading to waterlogging and fluctuation in salinity (Naidoo et al 2002;Sengupta and Chaudhuri 2002;Paliyavuth et al 2004;Jagtap and Nagle 2007). Like other marine organisms, they are exposed to the air and thus to the risk of desiccation and overheating; on the other hand they face waterlogging and salinity (Naidoo et al 2002;Sengupta and Chaudhuri 2002;Paliyavuth et al 2004;Jagtap and Nagle 2007).…”

Section: Introductionmentioning

confidence: 99%

Salt tolerance mechanisms in mangroves: a review

Parida

Jha

2010

Trees

318

230

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Mangroves are woody plants which form the dominant vegetation in tidal, saline wetlands along tropical and subtropical coasts. The current knowledge concerning the most striking feature of mangroves i.e., their unique ability to tolerate high salinity is summarized in the present review. In this review, we shall discuss recent studies that have focused on morphological, anatomical, physiological, biochemical, molecular and genetic attributes associated with the response to salinity, some of which presumably function to mediate salt tolerance in the mangroves. Here we shall also review the major advances recently made at both the genetic and the genomic levels in mangroves. Salinity tolerance in mangroves depends on a range of adaptations, including ion compartmentation, osmoregulation, selective transport and uptake of ions, maintenance of a balance between the supply of ions to the shoot, and capacity to accommodate the salt influx. The tolerance of mangroves to a high saline environment is also tightly linked to the regulation of gene expression. By integrating the information from mangroves and performing comparisons among species of mangroves and non-mangroves, we could give a general picture of salt tolerance mechanisms of mangroves, thus providing a new avenue for development of salt tolerance in crop plants through effective breeding strategies and genetic engineering techniques.

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Salt uptake and shoot water relations in mangroves

Cited by 56 publications

References 20 publications

Salinity effects on leaf ion composition and salt secretion rate in Avicennia germinans (L.) L.

Salinity effects on leaf ion composition and salt secretion rate in Avicennia germinans (L.) L.

Salinity strongly drives the survival, growth, leaf demography, and nutrient partitioning in seedlings of Xylocarpus granatum J. König

Salt tolerance mechanisms in mangroves: a review

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