Effects of gamma rays on germination and growth in Jatropha curcas L.

Nayak, Dileswar; Patil, N. S.; Behera, L. K.; Jadeja, D. B.

doi:10.31018/jans.v7i2.715

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…Hormetic effects of ionizing radiation were observed in various cell types of humans, animals, plants and fungi correspondingly causing increased cellular survival, as well as acceleration of growth and development (Lehrer & Rosenzweig, 2015; Tugay, Zhdanova, Zheltonozhsky, Sadovnikov, & Dighton, 2006). For example, germination and growth of seeds from diverse plant species are stimulated through IR‐doses below 15 Gy whereas increased exposures have inhibitory effects (Nayak, Patil, Behera, & Jadeja, 2015; Thapa, 2004; Zanzibar & Sudrajat, 2016). Specifically, stimulatory IR‐effects are still controversially discussed in the radiation biology community to date.…”

Section: Bio‐positive Effects Of Ir On Pollen Performancementioning

confidence: 99%

Implications of ionizing radiation on pollen performance in comparison with diverse models of polar cell growth

Stephan

2020

Plant Cell & Environment

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Research concerning the effects of ionizing radiation (IR) on plant systems is essential for numerous aspects of human society, as for instance, in terms of agriculture and plant breeding, but additionally for elucidating consequences of radioactive contamination of the ecosphere. This comprehensive survey analyses effects of x‐ and γ‐irradiation on male gametophytes comprising primarily in vitro but also in vivo data of diverse plant species. The IR‐dose range for pollen performance was compiled and 50% inhibition doses (ID50) for germination and tube growth were comparatively related to physiological characteristics of the microgametophyte. Factors influencing IR‐susceptibility of mature pollen and polarized tube growth were evaluated, such as dose‐rate, environmental conditions, or species‐related variations. In addition, all available reports suggesting bio‐positive IR‐effects particularly on pollen performance were examined. Most importantly, for the first time influences of IR specifically on diverse phylogenetic models of polar cell growth were comparatively analysed, and thus demonstrated that the gametophytic system of pollen is extremely resistant to IR, more than plant sporophytes and especially much more than comparable animal cells. Beyond that, this study develops hypotheses regarding a molecular basis for the extreme IR‐resistance of the plant microgametophyte and highlights its unique rank among organismal systems.

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Section: Bio‐positive Effects Of Ir On Pollen Performancementioning

confidence: 99%

Implications of ionizing radiation on pollen performance in comparison with diverse models of polar cell growth

Stephan

2020

Plant Cell & Environment

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“…In contrast, the leaf area of P. hastata first increased and then decreased as the irradiation rate increased. Research involving Jatropha curcas L. (Nayak et al, 2015) and Hibiscus sabdariffa (Shukla and Dube, 2017) indicated that with increased gamma irradiation, the leaf area had small increases and then decreased. In many cases, gamma irradiation could cause abnormal leaf shapes (Hanafiah et al, 2017;Minisi et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

60Co Irradiation Influences Germination and Phenotype of Three Pavonia Species

Yue¹,

Ruter²

2020

horts

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The genus Pavonia is one of the largest genera in the Malvaceae species; it is mainly distributed in South America. Three species of Pavonia were identified based on different flower colors and potential for landscape use in the southeastern United States. These species produce a large amount of seed at the end of the blooming season, which is not ideal for ornamental use. To reduce the seed set, gamma irradiation was used for mutation induction and propensity to induce compactness and sterility. A preliminary study indicated that the seed of Pavonia hastata would germinate at irradiation rates up to 2000 Gy. Seeds of three species were treated with six different dose rates ranging from 0 Gy to 1000 Gy to determine the ideal rate for Pavonia breeding and how gamma irradiation affected seed germination. M1 (the first mutant generation) P. lasiopetala and P. missionum were sown in 2018 and planted in the field at the University of Georgia Durham Horticulture Farm on 1 May 2019, as were M2 (the second mutant generation) seeds of P. hastata. Seed germination in 2019 showed no significance due to treatment but significance due to species and species by treatment interaction. Field evaluation performed in 2019 indicated that height was not influenced by irradiation for any of the three species but that the width index was. Flower diameter and leaf area of P. missionum became smaller as the irradiation rate increased, but the other two species showed no trends. Chlorophyll mutations were observed on P. hastata at the 1500 Gy level, which has attractive traits for ornamental use.

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“…Stimulatory effects on pollen germination and tube growth by low‐dose IR have been documented for diverse gymnosperm and angiosperm species (Chauhan and Katiyar, 1998; Chauhan and Katiyar, 1990; Lecuyer et al, 1991; Livingston and Stettler, 1973; Møller and Mousseau, 2017; Pandey and Kumar, 2013; Seibold et al, 1979; Yigit et al, 2009; Zelles and Seibold, 1976), reviewed in (Stephan, 2021) (Figure 1A). Corresponding to pollen, radiation hormesis has also been reported regarding performance of sporophytic plant tissues, in particular seed germination, seedling growth, root growth, flag leaf area, photosynthetic rate, stomatal conductance, and plant nutrition (Abdel‐Hady et al, 2008; Kim et al, 2005; Maity et al, 2005; Marcu et al, 2013; Nayak et al, 2015; Qi et al, 2015; Singh and Datta, 2010b; Singh and Datta, 2010a; Thapa, 2004; Zanzibar and Sudrajat, 2016; Fornalski et al, 2012).…”

Section: Ir‐based Hormesis On Pollen Performancementioning

confidence: 99%

“…Figure 2) (Maity et al, 2005;Marcu et al, 2013;Miller and Miller, 1987;Nayak et al, 2015;Qi et al, 2015;Stephan, 2021;Thapa, 2004;Zanzibar and Sudrajat, 2016). To date, still too little is known about the molecular responses to abiotic stress in plants.…”

Section: Introductionmentioning

confidence: 99%

“…However, the present study particularly aims to elucidate IR‐related hormesis in plants. It has been variously reported that diverse low doses of IR impose bio‐positive effects on numerous aspects of plant performance, for example, stimulation of pollen and seed germination as well as the growth of pollen tubes, seedlings, roots and shoots (Figure 1A, II; Figure 2) (Maity et al, 2005; Marcu et al, 2013; Miller and Miller, 1987; Nayak et al, 2015; Qi et al, 2015; Stephan, 2021; Thapa, 2004; Zanzibar and Sudrajat, 2016). To date, still too little is known about the molecular responses to abiotic stress in plants.…”

Section: Introductionmentioning

confidence: 99%

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Bio‐positive effects of ionizing radiation on pollen: The role of ROS

Stephan

2024

Physiologia Plantarum

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The concept of ‘hormesis’ is defined as a dose–response relationship whereby low doses of various toxic substances or physical stressors trigger bio‐positive effects in diverse biological systems, whereas high doses cause inhibition of cellular performance (e.g. growth, viability). The two‐sided phenomenon of specific low‐dose stimulation and high‐dose inhibition imposed by a ‘hormetic‐factor’ has been well documented in toxicology and pharmacology. Multitudinous factors have been identified that correspondingly cause hormetic effects in diverse taxa of animals, fungi, and plants. This study particularly aims to elucidate the molecular basis for stimulatory implications of ionizing radiation (IR) on plant male gametophytes (pollen). Beyond that, this analysis impacts general research on cell growth, plant breeding, radiation protection, and, in a wider sense, medical treatment. For this purpose, IR‐related data were surveyed and discussed in connection with the present knowledge about pollen physiology. It is concluded that IR‐induced reactive oxygen species (ROS) have a key role here. Moreover, it is hypothesized that IR‐exposure shifts the ratio between diverse types of ROS in the cell. The interrelation between ROS, intracellular Ca2+‐gradient, NADPH oxidases, ROS‐scavengers, actin dynamics, and cell wall properties are most probably involved in IR‐hormesis of pollen germination and tube growth. Modulation of gene expression, phytohormone signalling, and cellular antioxidant capacity are also implicated in IR‐hormesis.

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Effects of gamma rays on germination and growth in Jatropha curcas L.

Cited by 5 publications

References 16 publications

Implications of ionizing radiation on pollen performance in comparison with diverse models of polar cell growth

Implications of ionizing radiation on pollen performance in comparison with diverse models of polar cell growth

60Co Irradiation Influences Germination and Phenotype of Three Pavonia Species

Bio‐positive effects of ionizing radiation on pollen: The role of ROS

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