Evaluation of Drought Stress on Relative Water Content and Chlorophyll Content of Sesame (Sesamum indicum L.) Genotypes at Early Flowering Stage

Hassanzadeh, M.; Ebadi, Ali; Panahyan-e-Kivi, M.; Eshghi, Amir Gharib; Jamaati-e-Somarin, Shahzad; Saeidi, Mohsen; Zabihi-e-Mahmoodabad, Roghayyeh

doi:10.3923/rjes.2009.345.350

Cited by 78 publications

(37 citation statements)

References 26 publications

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“…However, in several other studies, chlorophyll concentration of potato increases significantly under mild and severe stress (Ramírez et al., ; Rolando, Ramírez, Yactayo, Monneveux, & Quiroz, ; Teixeira & Pereira, ; Yactayo et al., ). Chlorophyll content also increases under mild stress in Festuca arundinacea (Ebrahimiyan, Majidi, Mirlohi, & Noroozi, ) and under severe stress in Sesamum indicum L (Hassanzadeh et al., ). Controversial results of alterations in the chlorophyll content may be due to the crop species analysed, or the onset, duration and intensity of drought stress.…”

Section: Discussionmentioning

confidence: 99%

Drought stress‐induced changes in starch yield and physiological traits in potato

Rudack

Seddig

Sprenger

et al. 2017

J Agronomy Crop Science

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Drought stress is an important limitation for potato (Solanum tuberosum L.) production as potato depends on appropriate water availability for high yields of good quality. Therefore, especially in the background of climate change, it is an important goal in potato breeding to improve drought stress tolerance. In this study, 34 European starch potato cultivars were evaluated for drought stress tolerance by growing under well‐watered and long‐term drought stress conditions in rainout shelters in 2 years’ pot trials. Besides yield, six physiological traits, that is free proline content, osmolality, total soluble sugar content, chlorophyll content (SPAD), cell membrane stability and crude protein content, were determined in leaves sampled during vegetative growth and during flowering to investigate their association with drought tolerance. ANOVA revealed significant treatment effects for all physiological traits and increased genotypic effects at flowering. The sensitivity of physiological traits to drought was significantly higher during flowering than during vegetative growth. Drought stress decreased starch yield significantly (p < .001), on average by 55%. Starch yield was significantly influenced by genotype and genotype × treatment interactions. Stress tolerance index (STI) calculated from starch yield ranged from 0.26 (sensitive) to 0.76 (tolerant) with significant genotype effects (p ≤ .001). STI correlated positively with cell membrane stability (r = .59) and crude protein content (r = .38) and negatively with osmolality (r = −.57) and total soluble sugar content (r = −.71). These contrary correlations suggest a dual adaptation strategy in potato under long‐term drought stress conditions including increased membrane stability combined with an increased osmolality due to an increased soluble sugar content.

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Section: Discussionmentioning

confidence: 99%

Drought stress‐induced changes in starch yield and physiological traits in potato

Rudack

Seddig

Sprenger

et al. 2017

J Agronomy Crop Science

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“…Drought response indices (period of withholding water) have strong associations with water loss during water deficit conditions, demonstrating that cultivars showing low water loss, are more drought tolerance (Abdalla and El-Khoshiban, 2007;Hassanzadeh et al, 2009). RWC measurement is a general method used to determine leaf water balance in plants during water deficit periods (Uzildaya et al, 2012) and estimates the percentage of water present in the leaf as a fraction of the total volumetric water that the leaf can hold at full turgor (Blum, 1998).…”

Section: Leaf Water Statusmentioning

confidence: 98%

Antioxidant enzyme activity, proline accumulation, leaf area and cell membrane stability in water stressed Amaranthus leaves

Slabbert

Kruger

2014

South African Journal of Botany

103

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a b s t r a c tEdited by J van Staden Keywords: A. hybridus A. hypochondriacus Antioxidative enzymes A. tricolor Cell membrane stability Leaf area Leaf water status Metabolic response Osmoregulation Proline Relative water content Water stressTraditional crops are extremely important for food production in low income, food-deficit countries (LIFDCs) where they continue to be maintained by socio-cultural preferences and traditional uses. Significant potential exists to improve these crops, one of which is to select for improved productivity during moisture stress conditions. Germplasm of Amaranthus tricolor, Amaranthus hypochondriacus and Amaranthus hybridus were subjected to various screening methods to measure metabolic and physiological changes during water stress. The activities of enzymes involved in the oxygen-scavenging system during abiotic stress conditions (superoxide dismutase (SOD), ascorbate peroxidase (APX) and glutathione reductase (GR)), free proline production, leaf area (LA), cell membrane stability (CMS), leaf water potential (LWP) and relative water content (RWC) were measured in these three amaranth species during induced water stress. This study showed significant differences in metabolic responses during water deficit of the three species tested. Moisture stress and a decrease in RWC and LWP were first experienced in A. hybridus and A. hypochondriacus, followed by A. tricolor. There was an indirect correlation between leaf water status (RWC and LWP), enzyme activity, proline production and leaf area. The combined effect of GR, APX and SOD could ensure higher levels of regulation of the toxic effect of H 2 O 2 which could be associated with drought tolerance in Amaranthus. Distinct differences in onset of proline accumulation and the amount of accumulated in leaves upon induced water stress was noticed for the three amaranth species tested. Proline accumulation during water stress conditions in amaranth seems to be indirect and could possibly have a protective role apart from osmoregulation during stress conditions. This contention is supported by the decrease in leaf area and high cell membrane stability for two of the species tested. This study forms part of a project aimed at the development of improved traditional crops to contribute to food production and quality for subsistence farmers in areas with low precipitation or variable rainfall patterns.

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“…Leaf relative water content (RWC) is a good criterion for the primary selection of wheat and tomato genotypes tolerant and sensitive to drought (RAMPINO et al 2006, SÁNCHEZ-RODRÍGUEZ et al 2010. Also, RWC is better indicator of plant water status than water potential as it is associated with cell volume and precisely shows the balance between the absorbed and transpirated water (ROSALES-SERNAet al 2004, HASSANZADEH et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Chlorophyll content, photosynthetic efficiency and genetic markers in two sour cherry (Prunus cerasus L.) genotypes under drought stress

Viljevac¹,

Dugalić²,

Mihaljević³

et al. 2013

Acta Botanica Croatica

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-Drought is a limiting factor in fruit production today. Identification of sour cherry genotypes tolerant to drought will enable the sustainability of fruit production. The aim of our study was to select sour cherry genotypes according to their genetic background as well as drought tolerance and investigate possible mechanisms of drought tolerance through the changes in photosynthetic apparatus (i.e. photosynthetic pigment content) and photosynthesis process assessed through the chlorophyll fluorescence transient. All of them together with molecular markers (SSRs and AFLPs), relative water content (RWC) as indicator of plant water status distinguish two genotypes (Kelleris 16 and OS), which are the opposite in regards to drought tolerance. Down-regulation of photosynthesis in drought-treated Kelleris 16 plants was seen as changes in antenna complexes of PSII (decreased total chlorophylls content (a+b) and chlorophylls ratio (a/b)). Despite unchanged maximum quantum yield of PSII in drought-treated leaves of genotype OS, overall photosynthetic performance expressed as PI ABS was down-regulated in both investigated genotypes. However, decrement of PI ABS was much pronounced in genotype Kelleris 16, mainly because of changes in a certain fraction of RCs, which become dissipative centres, seen as increase in ABS/RC and DI 0 /RC, in order to avoid photooxidative damage of photosynthetic apparatus. Also, electron transport, seen as decrease in ET 0 /(TR 0 -ET 0 ) and ET 0 /RC, was impaired which lead to impaired CO 2 fixation and photosynthesis. The described changes in the functioning of photosynthetic apparatus in drought-treated plants of Kelleris 16 constitute the main distinction between the two investigated genotypes regarding drought adaptation mechanisms.

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Evaluation of Drought Stress on Relative Water Content and Chlorophyll Content of Sesame (Sesamum indicum L.) Genotypes at Early Flowering Stage

Cited by 78 publications

References 26 publications

Drought stress‐induced changes in starch yield and physiological traits in potato

Drought stress‐induced changes in starch yield and physiological traits in potato

Antioxidant enzyme activity, proline accumulation, leaf area and cell membrane stability in water stressed Amaranthus leaves

Chlorophyll content, photosynthetic efficiency and genetic markers in two sour cherry (Prunus cerasus L.) genotypes under drought stress

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