Germination and seedling growth responses of Sri Lankan grown Sesame/Thala (Sesamum indicum L.) for simulated drought conditions

Dissanayake, I.A.J.K.; Ranwala, S.M.W.; Perera, S. S. N.

doi:10.4038/jnsfsr.v47i4.9686

Cited by 5 publications

(10 citation statements)

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“…In some of these genotypes, germination was inhibited in both generations, M 2 and M 3 . These results are in agreement with those of Boureima et al [8], Harfi et al [20], and Dissanayake et al [12], who reported that the germination of sesame seeds is completely inhibited by a water potential lower than -1 MPa of PEG. However, some mutants kept germinating in this particular situation, showing their tolerance to such a high moisture stress level.…”

Section: Drought Stress Effects On Germinationsupporting

confidence: 93%

“…In the present study, all measured seed germination parameters, GP, GR, and MGT, were affected by drought in all genotypes studied, with a decrease in GP and GR and an increase in MGT, as a response to stress exposure. This is in agreement with findings of previous studies in sesame [8,12,19,20], as well as in other oilseed crops like rapeseed [28,29], sunflower [30], and safflower [21]. This may be due to the alteration of enzymes and hormones present in the seed or the generation of free radicals, which alter the metabolic pathways in seeds germinating under drought stress [31,32].…”

Section: Drought Stress Effects On Germinationsupporting

confidence: 92%

“…This may be due to the high sensitivity of shoot tissues to water deficit [40]. Similar results were reported in sesame by Mensah et al [19], El Harfi et al [20], and Dissanayake et al [12]. Our findings show that "ML2-10" and "ML2-5" are the most drought-tolerant among the genotypes studied.…”

Section: Drought Stress Effects On Early Seedlingsupporting

confidence: 90%

“…Harmful effects on sesame seed yield and quality are markedly noticed when this water stress happens, especially at germination and flowering stages [7][8][9][10]. Severe or prolonged drought adversely influences sesame productivity by reducing the number of capsules per plant, the yield, and the quality of the oil [11][12][13]. Drought stress can also affect the level of secondary metabolites and morphophysiological characteristics of the sesame seed [14].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a need to improve crop tolerance to drought by breeding and selecting appropriate germplasm to be used for the development of adapted cultivars that could enable sustainable and competitive sesame cultivation in arid and semiarid environments. However, just a few studies have been carried out on sesame tolerance to drought during germination and early seedling growth stages by using and investigating different genotypes [8,11,12,19,20]. Besides, and to our knowledge, only one study has been performed on sesame mutants that were obtained through gamma-ray treatment [8].…”

Section: Introductionmentioning

confidence: 99%

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First Report of Sesame Mutants Tolerant to Severe Drought Stress during Germination and Early Seedling Growth Stages

Kouighat

Hanine

Fechtali³

et al. 2021

Plants

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In the context of climate change and water scarcity, there is a need to develop and use drought-tolerant sesame cultivars. This study was conducted to evaluate the response of 13 sesame genotypes, including 11 mutants and their wild-types, to drought during germination and early seedling growth. Moderate and severe drought stress was simulated by applying polyethylene glycol (PEG) at two osmotic potentials, −0.6 MPa and −1.2 MPa, respectively, on seeds of two successive mutant generations, M2 and M3. The parameters measured or calculated were germination percentage (GP), germination rate (GR), mean germination time (MGT), root length (RL), shoot length (SL), root to shoot ratio (RSR), and the seedling vigor index (SVI). Results showed the significant effect of genotype, drought, and drought × genotype interaction on all parameters investigated. Under severe drought, seeds of seven genotypes, including wild types, were not able to germinate. There was a drastic decline of all parameters for the rest, except MGT and RSR, which markedly increased. Interestingly, two mutants, “ML2-5” and “ML2-10”, were identified as the most tolerant to severe drought and the most stable over both generations. The present work is the first report of sesame germplasm with such a high level of tolerance to drought during germination and early seedling growth stages.

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Section: Drought Stress Effects On Germinationsupporting

confidence: 93%

Section: Drought Stress Effects On Germinationsupporting

confidence: 92%

Section: Drought Stress Effects On Early Seedlingsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

First Report of Sesame Mutants Tolerant to Severe Drought Stress during Germination and Early Seedling Growth Stages

Kouighat

Hanine

Fechtali³

et al. 2021

Plants

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Germination and Seedling Properties of Lotus corniculatus L. Under Simulated Drought Stress

BEYAZ

2023

Tekirdağ Ziraat Fakültesi Dergisi

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Drought is an important abiotic stress factor that reduces agricultural production and yield in many crops, including forage crops, in agricultural areas around the world. Lotus corniculatus L. is the agriculturally crucial perennial legume forage crop that can tolerate moderate drought. However, studies to determine the responses of L. corniculatus to drought are limited. Therefore, this study was carried out to determine the seed germination and early seedling growth properties of L. corniculatus at different PEG6000 induced-drought treatments under in vitro conditions. In order to do this, L. corniculatus (cv. ‘AC Langille’) seeds were planted in MS (Murashige and Skoog/Gamborg) medium containing 0%, 4%, and 8% (w/v) PEG6000 for 14 days. In this study, germination percentage, mean germination time, germination rate index (speed of germination), shoot and root length, root to shoot length ratio, shoot and root fresh weight, shoot and root dry weight, shoot and root dry matter ratio, root shoot dry matter ratio, shoot and root water content and seedling vigor index parameters were measured. Our results showed that increasing drought levels resulted in an overall significant reduction in germination and seedling growth parameters except shortened mean germination time (especially, 4% PEG6000 treatment) and increased shoot and root dry matter ratio at higher (especially, 8% PEG6000 treatment) drought levels. When important growth parameters such as length, fresh and dry weight, dry matter ratio and water content, which show the development of root and shoot organs, are evaluated together, it has been determined that the root is negatively affected by drought stress at a higher rate. Based on these data, it can be concluded that the L. corniculatus will suffer a high yield loss under the drought stress at the osmotic potential (-1.03 bar) created by 8% PEG6000 treatment.

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Comparative analysis of drought stress-induced physiological and transcriptional changes of two black sesame cultivars during anthesis

Wang

Wang²,

Gui³

et al. 2023

Front. Plant Sci.

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Sesame production is severely affected by unexpected drought stress during flowering stage. However, little is known about dynamic drought-responsive mechanisms during anthesis in sesame, and no particular attention was given to black sesame, the most common ingredient in East Asia traditional medicine. Herein, we investigated drought-responsive mechanisms of two contrasting black sesame cultivars (Jinhuangma, JHM, and Poyanghei, PYH) during anthesis. Compared to PYH, JHM plants showed higher tolerance to drought stress through the maintenance of biological membrane properties, high induction of osmoprotectants’ biosynthesis and accumulation, and significant enhancement of the activities of antioxidant enzymes. For instance, the drought stress induced a significant increase in the content of soluble protein (SP), soluble sugar (SS), proline (PRO), glutathione (GSH), as well as the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) in leaves and roots of JHM plants compared to PYH plants. RNA sequencing followed by differentially expressed genes (DEGs) analysis revealed that more genes were significantly induced under drought in JHM than in PYH plants. Functional enrichment analyses disclosed that several pathways related to drought stress tolerance, such as photosynthesis, amino acids and fatty acid metabolisms, peroxisome, ascorbate and aldarate metabolism, plant hormone signal transduction, biosynthesis of secondary metabolites, and glutathione metabolism, were highly stimulated in JHM than in PYH plants. Thirty-one (31) key highly induced DEGs, including transcription factors and glutathione reductase and ethylene biosynthetic genes, were identified as potential candidate genes for improving black sesame drought stress tolerance. Our findings show that a strong antioxidant system, biosynthesis and accumulation of osmoprotectants, TFs (mainly ERFs and NACs), and phytohormones are essential for black sesame drought tolerance. Moreover, they provide resources for functional genomic studies toward molecular breeding of drought-tolerant black sesame varieties.

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Germination and seedling growth responses of Sri Lankan grown Sesame/Thala (Sesamum indicum L.) for simulated drought conditions

Cited by 5 publications

References 0 publications

First Report of Sesame Mutants Tolerant to Severe Drought Stress during Germination and Early Seedling Growth Stages

First Report of Sesame Mutants Tolerant to Severe Drought Stress during Germination and Early Seedling Growth Stages

Germination and Seedling Properties of Lotus corniculatus L. Under Simulated Drought Stress

Comparative analysis of drought stress-induced physiological and transcriptional changes of two black sesame cultivars during anthesis

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