β-Carotene Protects D1 Protein of Thylakoid during Senescence and Water Stress

Biswal, Basanti; Deo, P. M.

doi:10.1007/978-94-009-0173-5_832

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…We had, however, observed that a higher level of the β ‐carotene could be linked with the stability of the Dl protein in the clusterbean cotyledons during senescence and water stress (Biswal and Deo 1995) but the mechanism was not clear. A possible role of β ‐carotene for stability of the Dl protein has been demonstrated in the isolated PS II centres (Barber 1995).…”

Section: Discussionmentioning

confidence: 99%

“…This is, however, not unusual in the context of the recent findings of Murchie et al (1999), who have observed a low efficiency of the cycle during senescence of the flag leaf of a rice variety, IR 65, under photoinhibitory conditions. We had, however, observed that a higher level of the i-carotene could be linked with the stability of the Dl protein in the clusterbean cotyledons during senescence and water stress (Biswal and Deo 1995) but the mechanism was not clear. A possible role of i-carotene for stability of the Dl protein has been demonstrated in the isolated PS II centres (Barber 1995).…”

Section: Parametersmentioning

confidence: 94%

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Response of senescing cotyledons of clusterbean to water stress in moderate and low light: Possible photoprotective role ofβ‐carotene

Deo¹,

Biswal

2001

Physiologia Plantarum

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Senescence of clusterbean (Cyamopsis tetragonoloba L.) cotyledons in moderate light (12 W m-2) brings about a loss in the pigments, enhanced lipid peroxidation and a decline in PS II photochemical activity without any loss either in Dl protein or in the level of beta-carotene. The senescence syndrome is aggravated in the cotyledons of water-stressed seedlings with an increase in thylakoid lipid peroxidation, a decline in the level of beta-carotene and a quantitative loss in the Dl protein. Loss of the protein, however, is arrested in the seedlings experiencing water stress at low light (3 W m-2) intensity that correlates with the stability in the level of beta-carotene and a slow rate of lipid peroxidation. Loss of the protein in moderate light is attributed to water-stress sensitized photoinhibitory damage. The data on changes in the components of xanthophyll cycle suggest the low activity of the cycle both during senescence and water stress. It is, therefore, concluded that beta-carotene may contribute to the assembly and stability of the Dl protein during senescence and water stress in clusterbean cotyledons.

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Section: Discussionmentioning

confidence: 99%

Section: Parametersmentioning

confidence: 94%

Response of senescing cotyledons of clusterbean to water stress in moderate and low light: Possible photoprotective role ofβ‐carotene

Deo¹,

Biswal

2001

Physiologia Plantarum

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“…The photo-protective role of carotenoids in general (Young 1991 and of β-carotene in particular in protection of the photosystem 2 (PS2) reaction centre against photoinhibitory damage is known (Telfer et al 1994, Biswal and Deo 1995, Nayak et al 2001, 2002. Recently, we have observed a loss in the D1 protein in the cotyledons of clusterbean seedlings experiencing PEG-induced water stress at moderate but not low irradiance.…”

Section: Introductionmentioning

confidence: 95%

Water stress-sensitized photoinhibition in senescing cotyledons of clusterbean: Changes in thylakoid structures and inactivation of photosystem 2

Deo¹,

Biswal²,

Biswal³

2006

Photosynt.

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Seedlings of Cyamopsis tetragonoloba were grown on Petri dishes either in water or water plus 3 % PEG-6000 to induce water stress. The senescing cotyledons experiencing the stress exhibited loss in contents of leaf proteins and chlorophyll (Chl) and a decline in oxygen evolution. The effect of PEG treatment was more pronounced at moderate (MI) than low (LI) irradiance. The stress-induced loss in the activity of superoxide dismutase and increase in the thylakoid lipid peroxidation accompanied a change in the physical status of the bilayer membrane as demonstrated by an enhancement of room temperature Chl a fluorescence polarization and decrease in energy transfer efficiency in pigment assembly. This resulted in a sustained decrease in photosystem 2 activity blocking channels of energy utilization. The absorbed quanta, thus unutilized, were excess even at MI, leading to photoinhibitory response.

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Photosynthesis Under Stress

Biswal¹,

Biswal²

1999

Books in Soils, Plants, and the Environment

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β-Carotene Protects D1 Protein of Thylakoid during Senescence and Water Stress

Cited by 3 publications

References 7 publications

Response of senescing cotyledons of clusterbean to water stress in moderate and low light: Possible photoprotective role ofβ‐carotene

Response of senescing cotyledons of clusterbean to water stress in moderate and low light: Possible photoprotective role ofβ‐carotene

Water stress-sensitized photoinhibition in senescing cotyledons of clusterbean: Changes in thylakoid structures and inactivation of photosystem 2

Photosynthesis Under Stress

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