Variation in Drought Tolerance of Different Stylosanthes Accessions

Chandra, Amaresh; Pathak, P. K.; Bhatt, R. K.; Dubey, Archana

doi:10.1023/b:biop.0000041104.54922.31

Cited by 27 publications

(16 citation statements)

References 13 publications

(11 reference statements)

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“…One way many plants coped with water stress is to synthesize and accumulate compounds termed osmoprotectants (or compatible solutes) including polyols, sugars, amino acids, betaines, etc (Bohnert and Jensen 1996). Generally, in many plants free proline accumulates in response to a wide range of stresses, such as salinity stress (Delauney and Verma 1993), drought stress (Zhang et al 1995, Chandra et al 2004, extreme temperatures , heavy metal toxicity ) and nutrient deficiency . However, the precise function of proline accumulation is still a controversial question (Hare et al 1999).…”

Section: ⎯⎯⎯⎯mentioning

confidence: 99%

Effect of osmotic stress and sodium nitroprusside pretreatment on proline metabolism of wheat seedlings

Lei¹,

Yin²,

Ren³

et al. 2007

Biologia plant.

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Effect of osmotic stress and sodium nitroprusside (SNP, NO donor) pretreatment on growth and proline metabolism of wheat seedlings was investigated. Polyethylene glycol 6000 treatment for 2, 4 and 6 d could be termed as mild, moderate and severe stress, respectively, according to decrease in the relative water content. Severe osmotic stress significantly decreased the growth and photochemical efficiency, and increased proline content due to activation of its synthesis. 0.2 mM SNP pretreatment enhanced growth of wheat seedlings, increased variable to maximum fluorescence ratio (F v /F m ) and fluorescence yield, while decreased proline content. However, 2 mM SNP retarded the seedlings growth and chlorophyll a fluorescence, and increased proline accumulation. Our results showed that NO might be involved in the regulation of osmotic stress in a concentration-dependent manner.Additional key words: chlorophyll a fluorescence, exogenous nitric oxide, Triticum aestivum L.

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Section: ⎯⎯⎯⎯mentioning

confidence: 99%

Effect of osmotic stress and sodium nitroprusside pretreatment on proline metabolism of wheat seedlings

Lei¹,

Yin²,

Ren³

et al. 2007

Biologia plant.

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“…Higher LMA can be produced by increases in leaf density, in leaf thickness or both. High leaf thickness is often related to a great tolerance to drought (Chandra et al 2004), but recent studies showed an important decrease in leaf thickness under low irradiance and an important increase in leaf density under low soil water availability (Witkowsky and Lamont 1991, Groom andLamont 1997, Niinemets 2001). Therefore, it seems that sclerophyll leaf structure is not linked to any particular environmental stress and that can respond differently in sun than in the shade leaves.…”

Section: Introductionmentioning

confidence: 99%

Contrasting foliar responses to drought in Quercus ilex and Phillyrea latifolia

Ogaya¹,

Peñuelas²

2006

Biologia plant.

109

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Leaf morphology, longevity, and demography were examined in Quercus ilex and Phillyrea latifolia growing in a holm oak forest in Prades mountains (northeast Spain). Four plots (10 × 15 m) of this forest were submitted to an experimental drought during three years (soil moisture was reduced about 15 %). Leaf area, thickness and leaf mass per area ratio (LMA) were measured in sun and shade leaves of both species. Leaf longevity, the mean number of current-year shoots produced per previous-year shoot (Sn/Sn-1), the mean number of current-year leaves per previous-year shoot (Ln/Sn-1), and the percentage of previous-year shoots that developed new ones were measured once a year, just after leaf flushing. LMA and leaf thickness increased since leaf unfolding except in summer periods, when stomatal closure imposed low photosynthetic rates and leaves consumed their reserves. LMA, leaf area, and leaf thickness were higher in Q. ilex than in P. latifolia, but leaf density was higher in the latter species. Drought reduced the leaf thickness and the LMA of both species ca. 2.5 %. Drought also increased leaf shedding up to ca. 20 % in Phillyrea latifolia and decreased it up to ca. 20 % in Q. ilex. In the later species, Sn/Sn-1 decreased by 32 %, Ln/Sn-1 by 41 %, percentage of shoots developed new ones by 26 %, and leaf area by 17 %. Thus the decrease of leaf number and area was stronger in the less droughtresistant Q. ilex, which, under increasingly drier conditions, might lose its current competitive advantage in these Mediterranean holm oak forests.Additional key words: climate change, leaf longevity, leaf mass per area ratio, Mediterranean forest.

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“…Proline and glycinebetaine are well known compatible osmolytes that accumulate in plants under osmotic stress (Hare and Cress 1997, McNeil et al 1999, Chandra et al 2004, Jimenez-Bremont et al 2006. Their biosynthetic pathways are also well known.…”

Section: Introductionmentioning

confidence: 99%

Salinity induced changes in proline and betaine contents and synthesis in two aquatic macrophytes differing in salt tolerance

Tripathi¹,

Gurumurthi²,

Panigrahi³

et al. 2007

Biol. plant.

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The present work investigated the effect of NaCl and seawater salinity (SWS) on accumulation of proline and glycinebetaine (betaine) and expression of two key enzymes of their biosynthetic pathway, betainealdehyde dehydrogenase (BADH) and Δ 1 -pyrroline-5-carboxylate synthetase (P5CS) in two aquatic macrophytes, salt-tolerant Najas gramenia and moderately-salt-tolerant Najas indica. N. gramenia did not show any accumulation of betaine or expression of BADH in response to NaCl or SWS treatments. The content of proline increased significantly in response to the salt treatments. High expression of P5CS was also observed, however, the transcript abundance did not correlate with the amount of proline. N. indica, exhibited significantly greater accumulation of proline in response to SWS, which contained Ca 2+ in addition to NaCl, than in response to NaCl alone.Additional key words: betaine aldehyde dehydrogenase, NaCl, Najas gramenia, Najas indica, Δ 1 -pyrroline-5-carboxylate synthetase, seawater salinity.

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Variation in Drought Tolerance of Different Stylosanthes Accessions

Cited by 27 publications

References 13 publications

Effect of osmotic stress and sodium nitroprusside pretreatment on proline metabolism of wheat seedlings

Effect of osmotic stress and sodium nitroprusside pretreatment on proline metabolism of wheat seedlings

Contrasting foliar responses to drought in Quercus ilex and Phillyrea latifolia

Salinity induced changes in proline and betaine contents and synthesis in two aquatic macrophytes differing in salt tolerance

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