Differential responses of ribulose-1,5-bisphosphate carboxylase/oxygenase activities of two Vigna unguiculata cultivars to salt stress

Aragão, Maria Erivalda Farias de; Guedes, Marjorie Moreira; Otoch, Maria de Lourdes Oliveira; Guedes, Maria Izabel Florindo; Melo, Dirce Fernandes de; Lima, María da Guia Silva

doi:10.1590/s1677-04202005000200003

Cited by 16 publications

(8 citation statements)

References 19 publications

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“…Nevertheless, it is not clear if the photosynthetic response depends on stomatal or non-stomatal factors. Aragäo et al (2005) found that Vita3 had a lower RA than Vita5 under salt stress, while the former grew better than the latter.…”

Section: Introductionmentioning

confidence: 92%

Photosynthetic response of salt-tolerant and sensitive soybean varieties

Lu¹,

Cao²,

Feng³

et al. 2009

Photosynt.

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The physiological response of two soybean varieties to salt stress was examined. The results showed that salt stress induced a significantly (p<0.01) lower decrease of the net photosynthetic rate (P N ) in salt-tolerant S111-9 than in saltsensitive Glycine max. P N decrease was positively related to the decrease of stomatal conductance (g s ) and intercellular CO 2 concentration (C i ) in S111-9, while with g s in G. max. a threshold of relative water content (RWC) was found, above which a slight decrease in RWC lead to a sharp reduction in g s . The photochemical quenching (q P ), the efficiency of open PSII centers(Φ PSII )and the Rubisco activity (RA) significantly decreased with increasing salinity level in G. max. The maximum PSII quantum yield(F v /F m )decreased significantly under the highest NaCl in both varieties. The higher reduction of RA in G. max was attributed to Rubisco content, which was mainly regulated at LSU expression level rather than at rbcL transcript level. These findings led us to conclude that the salt-induced reduction in P N was mainly due g s and RA for S111-9 and G. max, respectively.

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Section: Introductionmentioning

confidence: 92%

Photosynthetic response of salt-tolerant and sensitive soybean varieties

Lu¹,

Cao²,

Feng³

et al. 2009

Photosynt.

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“…Under high saline stress, the metabolic processes of photosynthesis are affected, and the thermostatic pressure is activated by a number of stroma enzymes that reduce CO 2 (Xue et al, 2008 ; Biswal et al, 2011 ). Additionally, the activity of Rubisco is inhibited both in vitro and in vivo under high salt stress (Aragao et al, 2005 ). In general, the enhanced activity of Rubisco provides stability to plants under stress conditions, and the leaf rubisco level shows a positive relationship with phosphorous (P) and N levels in most C 3 plants, except in glycophytic species; however, a contrasting relationship is detected under salt stress (Aragao et al, 2005 ; Taub, 2010 ; Makino, 2011 ).…”

Section: Effects On Activities Of Key Photosynthetic Enzymesmentioning

confidence: 99%

“…Additionally, the activity of Rubisco is inhibited both in vitro and in vivo under high salt stress (Aragao et al, 2005 ). In general, the enhanced activity of Rubisco provides stability to plants under stress conditions, and the leaf rubisco level shows a positive relationship with phosphorous (P) and N levels in most C 3 plants, except in glycophytic species; however, a contrasting relationship is detected under salt stress (Aragao et al, 2005 ; Taub, 2010 ; Makino, 2011 ). This contrasting equation needs further investigation to clarify the relationship between these traits.…”

Section: Effects On Activities Of Key Photosynthetic Enzymesmentioning

confidence: 99%

Mechanisms Regulating the Dynamics of Photosynthesis Under Abiotic Stresses

et al. 2021

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Photosynthesis sustains plant life on earth and is indispensable for plant growth and development. Factors such as unfavorable environmental conditions, stress regulatory networks, and plant biochemical processes limits the photosynthetic efficiency of plants and thereby threaten food security worldwide. Although numerous physiological approaches have been used to assess the performance of key photosynthetic components and their stress responses, though, these approaches are not extensive enough and do not favor strategic improvement of photosynthesis under abiotic stresses. The decline in photosynthetic capacity of plants due to these stresses is directly associated with reduction in yield. Therefore, a detailed information of the plant responses and better understanding of the photosynthetic machinery could help in developing new crop plants with higher yield even under stressed environments. Interestingly, cracking of signaling and metabolic pathways, identification of some key regulatory elements, characterization of potential genes, and phytohormone responses to abiotic factors have advanced our knowledge related to photosynthesis. However, our understanding of dynamic modulation of photosynthesis under dramatically fluctuating natural environments remains limited. Here, we provide a detailed overview of the research conducted on photosynthesis to date, and highlight the abiotic stress factors (heat, salinity, drought, high light, and heavy metal) that limit the performance of the photosynthetic machinery. Further, we reviewed the role of transcription factor genes and various enzymes involved in the process of photosynthesis under abiotic stresses. Finally, we discussed the recent progress in the field of biodegradable compounds, such as chitosan and humic acid, and the effect of melatonin (bio-stimulant) on photosynthetic activity. Based on our gathered researched data set, the logical concept of photosynthetic regulation under abiotic stresses along with improvement strategies will expand and surely accelerate the development of stress tolerance mechanisms, wider adaptability, higher survival rate, and yield potential of plant species.

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“…The PSII efficiency was expressed as the F v / F m ratio. The specific energy fluxes such as absorption (ABS), electron transport (ET) and dissipation (DI) per reaction center (RC) were also measured (Aragão et al, 2005).…”

Section: Photosynthetsis In Salvinia Exposed To Chromium and Zinc Ricmentioning

confidence: 99%

Photosynthetic performance of Salvinia natans exposed to chromium and zinc rich wastewater

Dhir

Sharmila

Saradhi

2008

Braz. J. Plant Physiol.

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Investigations were carried out to evaluate alterations in photosynthetic performance of Salvinia natans (L.) exposed to chromium (Cr) and zinc (Zn) rich wastewater. Accumulation of high levels of Cr and Zn in plants affected photosynthetic electron transport. Photosystem-(PS) II-mediated electron transport was enhanced in plants exposed to Cr rich wastewater while a decline was observed in Zn-exposed plants. Photosystem-I-mediated electron transport increased in plants exposed to Cr and Zn rich wastewater. Efficiency of photosystem II (F v /F m ) measured by fluorescence did not show any significant change in Cr-exposed plants but a decrease was observed in Zn-exposed plants as compared to the control. The enhancement in PS I-induced cyclic electron transport in Cr and Zn exposed plants led to a build up of the transthylakoidal proton gradient (∆pH) which subsequently helped in maintaining the photophosphorylation potential to meet the additional requirement of ATP under stress. The carbon assimilation potential was adversely affected as evident from the decrease in Rubisco (EC 4.1.1.39) activity. The alterations in photosynthetic electron transport affected stromal redox status and induced variations in the level of stromal components such as pyridine nucleotides in plants exposed to Cr and Zn rich wastewater. The present investigations revealed that alteration in the photosynthetic efficiency of Salvinia exposed to Cr could primarily be the result of a decline in carbon assimilation efficiency relative to light-mediated photosynthetic electron transport, though in the case of Zn-exposed plants both these factors were affected equally. Key words: carbon assimilation, electron transport, heavy metals, photophosphorylation, redox status Desempenho fotossintético de plantas de Salvinia natans expostas a água de esgoto rica em cromo e zinco: Avaliou-se o desempenho fotossintético de plantas de Salvinia natans L. expostas a água de esgoto rica em cromo (Cr) e zinco (Zn). O acúmulo de Cr e Zn em altos níveis afetou o transporte fotossintético de elétrons. O transporte de elétrons mediado pelo fotossistema (FS) II aumentou nas plantas expostas ao esgoto rico em Cr, observando-se o oposto nas plantas expostas ao esgoto rico em Zn. O transporte de elétrons mediado pelo FS I aumentou nas plantas expostas ao esgoto rico tanto em Cr como em Zn. A eficiência do FS II (F v /F m ) avaliada por fluorescência não variou significativamente em resposta ao Cr, porém reduziu-se nas plantas expostas ao esgoto rico em Zn, em comparação com as plantas-controle. O aumento do transporte cíclico de elétrons associado ao FS I acarretou em aumento do gradiente transtilacoidal de prótons (∆pH) que, por seu turno, esteve associado com o potencial de fotofosforilação para suportar as necessidades adicionais de ATP sob condições de estresse. O potencial de assimilação do carbono foi decrescido, conforme se deduz da menor atividade da Rubisco (EC 4.1.1.39). As alterações no transporte fotossintético de elétrons afetaram o status redox do estro...

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Differential responses of ribulose-1,5-bisphosphate carboxylase/oxygenase activities of two Vigna unguiculata cultivars to salt stress

Cited by 16 publications

References 19 publications

Photosynthetic response of salt-tolerant and sensitive soybean varieties

Photosynthetic response of salt-tolerant and sensitive soybean varieties

Mechanisms Regulating the Dynamics of Photosynthesis Under Abiotic Stresses

Photosynthetic performance of Salvinia natans exposed to chromium and zinc rich wastewater

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