Enhanced drought resistance in fructan-producing sugar beet

Pilon‐Smits, Elizabeth A. H.; Terry, Norman; Sears, Tobin; Dun, Kees van

doi:10.1016/s0981-9428(99)80030-8

Cited by 125 publications

(40 citation statements)

References 11 publications

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“…These observations were previously made in soybean, pigeon pea and sugarcane mature culms under water stress (Lawlor and Cornic, 2002;Liu et al, 2004;Rodrigues et al, 2009 andIskandar et al, 2011). The higher levels of fructose produced in stressed plants in both varieties was an indicator that fructans were possibly the main storage carbohydrates remobilized to fructose under stress with suggestive roles in osmoregulation (Pilon-Smits et al, 1999;Livingston III et al, 2009;Gaudet et al, 2011 ;Van den Ende and El-Esawe, 2014).…”

Section: Discussionsupporting

confidence: 62%

The role of sucrose metabolizing proteins in hyperosmotic stress tolerance in sweet sorghum (Sorghum bicolor L. Moench)

Njokweni¹,

Ibraheem²,

Ndimba³

2016

Plant Omics

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Sugar accumulation is a common metabolic response under drought stress conditions. However, studies on the underlying molecular mechanisms of sugar accumulation under stress remain restricted. This study explores the role of sucrose metabolizing proteins in conferring tolerance to drought-induced hyperosmotic stress, and ultimately osmotic adjustment in sorghum. The effect of stress on sugar content, enzyme activity and gene expression was investigated. Sweet sorghum varieties (ICSV213 and ICSB338) differing in levels of drought tolerance were subjected to a 10-day water deficit period. Brix plant sap analysis indicated elevated total soluble sugar levels under water stress conditions in both varieties with ICSV213 demonstrating a higher brix content than ICSB338. HPLC analysis gave a decrease in sucrose levels and an increase in glucose and fructose concentrations in both varieties with ICSV213 demonstrating higher hexose levels. Enzyme activity levels of invertase, sucrose phosphate synthase and sucrose synthase were found to increase under stress in both varieties with ICSV213 invertase displaying the highest activity when compared to other sucrose metabolizing enzymes. Transcriptional expression of invertase and sucrose phosphate synthase (SPS) genes was significantly up regulated in ICSV213 under stressed conditions, whereas sucrose synthase (Susy) levels remained low in both varieties. Data obtained for sorghum variety ICSV213 points towards a relationship between hyperosmotic stress tolerance and the accumulation of solutes and sucrose metabolism proteins. Consequently variety ICSV213 may therefore be an excellent target for future development of hyperosmotic stress tolerant sweet sorghum.

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Section: Discussionsupporting

confidence: 62%

The role of sucrose metabolizing proteins in hyperosmotic stress tolerance in sweet sorghum (Sorghum bicolor L. Moench)

Njokweni¹,

Ibraheem²,

Ndimba³

2016

Plant Omics

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“…Clues from molecular genetic (de los Reyes and McGrath 2003;Stich et al 2008) and proteomic studies (Hajheidari et al 2005) can target genes that could play critical roles in determining stress tolerance. Indeed, there are encouraging results for transgenic drought tolerance (Pilon-Smits et al 1999) and salinity (Liu et al 2008), but if and how these gene events can be developed into competitive commercial varieties and grown on farms remains to be seen. Figs.…”

Section: Future Needs and Developmentsmentioning

confidence: 99%

Abiotic Stress in Sugar Beet

Ober

Rajabi²

2010

Sugar Tech

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The production of sugar beet (Beta vulgaris L.) is often limited by environmental conditions that cause decreased rates of photosynthesis, canopy expansion, root growth and sucrose accumulation. These conditions include insufficient water, heat, freezing temperatures and salinity. Compared to other crops such as cereals, harvestable sugar yields can be obtained even under harsh growing conditions. However, the realization of maximum production efficiency and profits demands that varieties must show less susceptibility to abiotic stress and improved yield stability across a range of environments. This is particularly urgent in light of climate change models that predict hotter and drier growing conditions for many areas. There are only limited breeding efforts to improve the tolerance of new varieties to these stresses, in part because the mechanisms of tolerance are poorly understood and methods to screen germplasm for resistant genotypes have not been fully developed. Fortunately, there appears to be significant genotypic diversity for tolerance to drought, heat, cold and salinity within sugar beet germplasm, so opportunities exist for varietal improvements. Developments in irrigation technologies and innovations in agronomy and soil management techniques may also contribute to improved yields of crops faced with abiotic stresses.

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“…In response to salinity and drought stresses, plants adopt various strategies including modification in different physiological as well as biochemical processes such as signal perceptions and transduction cascades for survival against these stresses (Faical et al 2009;Ranganayakulu et al 2013). Studies showed that osmotic regulations in plants during salinity and drought stresses have occurred through higher accumulation of osmotically active compounds or osmoprotectants (Pilon-Smits et al 1999;Chen et al 2000;Sawahel 2004; Le and McQueen-Mason 2006;Galvani 2007;Parida et al 2008;Hossain and Fujita 2010;Li et al 2011;Ranganayakulu et al 2013;Shahbaz et al 2013;Talat et al 2013;Filippou et al 2014). Osmoprotectants or compatible solutes are small molecules having low molecular weight, electrically neutral, highly soluble and non-toxic at molar concentrations (Ahn et al 2011).…”

mentioning

confidence: 99%

Roles of osmoprotectants in improving salinity and drought tolerance in plants: a review

Singh

Kumar

Singh

et al. 2015

Rev Environ Sci Biotechnol

550

259

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Abiotic stresses collectively are responsible for crop losses worldwide. Among various abiotic stresses, drought and salinity are the most destructive. Different strategies have been adopted for the management of these stresses. Being complex traits, conventional breeding approaches have shown less success in improving salinity and drought stress tolerance. Roles of compatible solutes in salinity and drought stress tolerance have been studied extensively. At physiological level, osmotic adjustment is an adaptive mechanism involved in drought and/or salinity tolerance and permits the maintenance of turgor pressure under stress conditions. Increasing evidences from series of in vivo and in vitro studies involving physiological, biochemical, genetic, and molecular approaches strongly suggest that osmolytes such as ammonium compounds (polyamines, glycinebetaine, b-alanine betaine, dimethyl-sulfonio propionate and choline-O-sulfate), sugars and sugar alcohols (fructan, trehalose, mannitol, D-ononitol and sorbitol) and amino acids (proline and ectoine) perform important function in adjustment of plants against salinity and drought stresses. Thus, aim of this review is to expose how to osmoprotectants detoxify adverse effect of reactive oxygen species and alleviate drought and salinity stresses. An understanding of the relationship between these two sets of parameters is needed to develop measures for mitigating the damaging impacts of salinity and drought stresses.

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Enhanced drought resistance in fructan-producing sugar beet

Cited by 125 publications

References 11 publications

The role of sucrose metabolizing proteins in hyperosmotic stress tolerance in sweet sorghum (Sorghum bicolor L. Moench)

The role of sucrose metabolizing proteins in hyperosmotic stress tolerance in sweet sorghum (Sorghum bicolor L. Moench)

Abiotic Stress in Sugar Beet

Roles of osmoprotectants in improving salinity and drought tolerance in plants: a review

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