Looking for molecular and physiological markers of osmotic adjustment in sunflower

Jamaux, I.; Steinmetz, André; Belhassen, E.

doi:10.1046/j.1469-8137.1997.00817.x

Cited by 69 publications

(37 citation statements)

References 20 publications

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“…In fact, RWC is a key indicator of the degree of cell and tissue hydration, which is crucial for optimum physiological functioning and growth processes (Jamaux et al, 1997). In the present study, we showed that H 2 O 2 levels increased approximately 30% in T4 and T5 leaves after a 50-day exposure of salt stress (Table 3).…”

Section: Discussionsupporting

confidence: 57%

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Campos

Hsie

Granja

et al. 2012

Braz. J. Plant Physiol.

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Biodiesel is an alternative to petroleum diesel fuel. It is a renewable, biodegradable, and nontoxic biofuel. Interest in the production of biodiesel from Jatropha curcas L. seeds has increased in recent years, but the ability of J. curcas to grow in salt-prone areas, such as the Caatinga semiarid region, has received considerably meager attention. The aim of this study was to identify the main physiological processes that can elucidate the pattern of responses of J. curcas irrigated with saline water, which commonly occurs in the semiarid Caatinga region. This study measured the activity of the antioxidant enzymes involved in the scavenging of reactive oxygen species, which include catalase (CAT) and ascorbate peroxidase (APX), as well as malondialdehyde (MDA) levels. The levels of chlorophyll (Chl), carotenoids, amino acids, proline, and soluble proteins were also analyzed. The net carbon assimilation rate (P N ), stomata conductance (g s ), and transpiration rate (E) decreased with salt stress. The activities of CAT and APX were decreased, while H 2 O 2 and MDA levels as well as electrolyte leakage were significantly increased in salt-stressed plants compared to the untreated ones. These observations suggest that the ability of J. curcas plants resist to salt stress is associated with the activities of protective enzymes and their defensive functions. However, our results indicate that the reactive oxygen species scavenging system is not sufficient to protect J. curcas leaves against oxidative damage caused by salt stress, and, therefore, it cannot be treated as a salt tolerant plant species.

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Section: Discussionsupporting

confidence: 57%

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Campos

Hsie

Granja

et al. 2012

Braz. J. Plant Physiol.

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“…In fact, RWC is a key indicator of the degree of cell and tissue hydration, which is crucial for optimum physiological functioning and growth processes. Numerous studies have shown that main- (Jamaux et al, 1997;Altinkut et al, 2001;Colom and Vazzana, 2003). Before the onset of treatments there was no significant correlation between the parameters, with the exception of a positive association between F v /F m and RWC (Table 4).…”

Section: Screening For Drought Tolerance In Sugarcanementioning

confidence: 99%

“…Rong-hua et al (2006), working with barley, showed that indirect and faster methods of measuring photosynthetic activity, such as chlorophyll a fluorescence technique, particularly the maximum photochemical efficiency of photosystem II -PSII (which can be assessed via the variable-to-maximum chlorophyll a fluorescence ratio, F v / F m ) and estimated chlorophyll content (SPAD index), can be as effective as the more time-consuming gas exchange techniques in revealing differences between drought tolerant and susceptible genotypes. Other physiological parameters such as LT and relative water content (RWC) are also very responsive to drought stress and have been shown to correlate well with drought tolerance (Jamaux et al, 1997;Altinkut et al, 2001;Colom and Vazzana, 2003).…”

Section: Introductionmentioning

confidence: 99%

Use of physiological parameters as fast tools to screen for drought tolerance in sugarcane

Silva¹,

Jifon

Silva

et al. 2007

Braz. J. Plant Physiol.

256

159

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Use of physiological parameters as fast tools to screen for drought tolerance in sugarcane: Drought is one of the major limitations to plant productivity worldwide. Identifying suitable screening tools and quantifiable traits would facilitate the crop improvement process for drought tolerance. In the present study, we evaluated the ability of four relatively physiological parameters (variable-to-maximum chlorophyll a fluorescence ratio, F v /F m ; estimated leaf chlorophyll content via SPAD index; leaf temperature, LT; and, leaf relative water content, RWC) to distinguish between drought tolerant and susceptible sugarcane genotypes subjected to a 90-d drought cycle. Eight field-grown genotypes were studied. By 45 d after the onset of treatments, the F v /F m , SPAD index and RWC of drought-stressed plants had declined significantly in all genotypes compared to values at the onset of well-watered treatments. However, the reductions were more severe in leaves of susceptible genotypes. Under drought stress, the tolerant genotypes as a group, maintained higher F v /F m (8%), SPAD index (15%), and RWC (16%) than susceptible genotypes. In general, LT of drought-stressed plants was higher (~4°C) than that of well-watered plants but the relative increase was greater among drought susceptible genotypes. Under drought stress, LT of tolerant genotypes was on average 2.2°C lower than that of susceptible genotypes. The results are consistent with the tolerantsusceptible classification of these genotypes and indicate that these tools can be reliable in screening for drought tolerance, with F v /F m , SPAD index and LT having the added advantage of being nondestructive and easily and quickly assessed. Key words: chlorophyll a fluorescence, relative water content, leaf temperature, Saccharum, water deficit Uso de parâmetros fisiológicos como ferramentas rápidas para selecionar tolerância à seca em cana-de-açúcar: A seca é uma das maiores limitações à produtividade das plantas em todo o mundo. Identificar ferramentas satisfatórias de seleção e características quantitativas facilitaria o processo de melhoramento de uma cultura para tolerância à seca. No presente estudo, foi avaliada a adequação de quatro parâmetros fisiológicos (razão entre fluorescências variável e máxima da clorofila a, F v /F m ; estimativa do conteúdo de clorofila na folha via o índice SPAD; temperatura da folha, TF; e conteúdo relativo de água na folha, CRA) para distinguir entre genótipos de cana-de-açúcar tolerantes e suscetíveis submetidos a um ciclo de 90 dias de déficit hídrico. Foram avaliados oito genótipos, cultivados sob condições de campo. Aos 45 dias após o estabelecimento dos tratamentos, F v /F m , índice SPAD e CRA das plantas sob estresse declinaram significativamente em todos os genótipos, comparados aos respectivos controles sob condições ideais de irrigação. Entretanto, as reduções foram mais severas nas folhas dos genótipos suscetíveis à seca. Sob estresse hídrico, o grupo dos genótipos tolerantes manteve maiores valores de F v /F m (8%), ...

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“…1995), rice ( Oryza sativa L.) Price & Courtois 1999), barley ( Hordeum vulgare L.) (Teulat et al . 1998) and sunflower ( Helianthus annuus L.) (Jamaux, Steinmetz & Belhassen 1997).…”

Section: Introductionmentioning

confidence: 99%

Osmolyte accumulation: can it really help increase crop yield under drought conditions?

Serraj

Sinclair

2002

Plant Cell & Environment

718

370

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Osmolyte accumulation (OA) is frequently cited as a key putative mechanism for increasing yields of crops subjected to drought conditions. The hypothesis is that OA results in a number of benefits that sustain cell and tissue activity under water-deficit conditions. It has been proposed as an effective tolerance mechanism for water deficits, which could be enhanced in crops by traditional plant breeding, marker-assisted selection or genetic engineering, to generate drought-tolerant crops. However, field studies examining the association between OA and crop yield have tended to show no consistent benefit. The few, often-cited, investigations with positive associations were obtained under severe water deficits with extremely low yields or conditions with special water-supply scenarios when much of the benefit is plant survival. Under conditions where water deficits threaten crop survival, yields are so low that even large fractional yield gains offer little practical benefit to growers. Indeed, the often-cited benefit of turgor maintenance in cells is likely to result in crop behaviour that is exactly opposite to what is beneficial to crops. The one clear mechanism identified in this review for beneficial yield responses to OA is in the maintenance of root development in order to reach water that may be available deeper in the soil profile.

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Looking for molecular and physiological markers of osmotic adjustment in sunflower

Cited by 69 publications

References 20 publications

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Photosynthesis and antioxidant activity in Jatropha curcas L. under salt stress

Use of physiological parameters as fast tools to screen for drought tolerance in sugarcane

Osmolyte accumulation: can it really help increase crop yield under drought conditions?

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