Drought Resistance and Its Improvement

Blum, A.

doi:10.1007/978-1-4419-7491-4_3

Cited by 48 publications

(38 citation statements)

References 410 publications

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“…The role of Ψ tlp in driving stomatal closure has been questioned by several authors (Ali et al ; Turner ) who showed that stomatal closure is more closely related to soil water potential than leaf water potential or Ψ tlp . Further, guard cell turgor, rather than bulk leaf turgor, is more closely related to stomatal function (Blum ; Cowan ). It has also been suggested that the association between turgor maintenance and stomatal control of water use is primarily driven by cavitation‐induced losses of leaf hydraulic conductance ( K leaf ) (Brodribb and Holbrook ; Sperry ) and stomatal conductance can continue despite partial cavitation (Manzoni et al ; Vilagrosa et al ).…”

Section: Discussionmentioning

confidence: 99%

“…Others have also suggested that the link between turgor maintenance and gas exchange is ambiguous (Sperry ) and that stomatal closure is primarily coordinated with loss in leaf hydraulic conductance through cavitation (Brodribb and Holbrook ). As Ψ tlp reflects bulk leaf turgor, stomatal closure may also occur earlier than the Ψ tlp in some species because of chemical signalling or where bulk leaf water potential differs from guard cell turgor (Blum ). Therefore, there is a need to confirm the relationship between Ψ tlp and water potential at stomatal closure for a broader range of species and life‐forms to determine whether Ψ tlp can be used as a trait to characterize stomatal sensitivity to drought stress.…”

Section: Introductionmentioning

confidence: 99%

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Does the turgor loss point characterize drought response in dryland plants?

Farrell

Szota

Arndt

2017

Plant Cell & Environment

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The water potential at turgor loss point (Ψ ) has been suggested as a key functional trait for determining plant drought tolerance, because of its close relationship with stomatal closure. Ψ may indicate drought tolerance as plants, which maintain gas exchange at lower midday water potentials as soil water availability declines also have lower Ψ . We evaluated 17 species from seasonally dry habitats, representing a range of life-forms, under well-watered and drought conditions, to determine how Ψ relates to stomatal sensitivity (pre-dawn water potential at stomatal closure: Ψg ) and drought strategy (degree of isohydry or anisohydry; ΔΨ between well-watered conditions and stomatal closure). Although Ψg was related to Ψ , Ψg was better related to drought strategy (ΔΨ ). Drought avoiders (isohydric) closed stomata at water potentials higher than their Ψ ; whereas, drought tolerant (anisohydric) species maintained stomatal conductance at lower water potentials than their Ψ and were more dehydration tolerant. There was no significant relationship between Ψ and ΔΨ . While Ψ has been related to biome water availability, we found that Ψ did not relate strongly to stomatal closure or drought strategy, for either drought avoiders or tolerators. We therefore suggest caution in using Ψ to predict vulnerability to drought.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Does the turgor loss point characterize drought response in dryland plants?

Farrell

Szota

Arndt

2017

Plant Cell & Environment

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“…Osmotic adjustment (OA) is due to a net increase in intracellular solutes independent of dehydration, which decreases the cell sap osmotic potential (Turner, ). OA antagonizes dehydration and turgor loss and is increased in drought tolerant cultivars (Blum, ; Blum & Sullivan, ; Cattivelli et al., ; Serraj & Sinclair, ; Vos & Groenwold, ). Genetic variation in OA has been identified (Zhang, Nguyen, & Blum, ).…”

Section: Introductionmentioning

confidence: 99%

Impact of nitrogen supply on leaf water relations and physiological traits in a set of potato (Solanum tuberosumL.) cultivars under drought stress

Meise

Seddig

Uptmoor

et al. 2018

J Agronomy Crop Science

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Improved adaptation of potato to limited water availability is needed for stable yields under drought. The maintenance of the cell water status and protection of cellular components against dehydration are important for drought tolerance, and the N status of plants affects the regulation of various respective metabolic processes. A 2‐year pot trial with 17 potato cultivars was conducted under a rain‐out shelter including two water regimes and two N‐levels to investigate genotypic differences concerning osmotic adjustment (OA) and relevant biochemical traits in relation to nitrogen (N) supply. Drought stress resulted in a rapid decrease in the leaf osmotic potential. The N, protein and proline contents increased under drought, while the N protein/NKjeldahl ratio decreased. Initially, total soluble sugars increased at both N‐levels but dropped back to the control level at high N‐availability under prolonged drought while remaining high in N‐deficient plants. Results indicate that potatoes have only a limited capacity of active OA and that increasing sugar and proline concentrations are rather associated with the protection of cellular components. High N supply promoted the N protein/NKjeldahl ratio at short‐term drought and enhanced proline accumulation. Significant genotypic differences were observed for all investigated traits.

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“…Evapotranspiration is the most leadership power that affects the soil, plant, and atmospheric continuum of the hydrologic cycle. In previously papers, foretelling of water deficit were mainly based on countervail and apportionment of downpour (Blum, 2011). Generation and selecting for novel incorporations of genes to manufacture genotypes with eminent character performances than those of presenting genotypes, through the goal climate, is the main thematic of plant breeding (Chapman et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Boyer and Westgate (2004) assessed that drought stress is one of the most significant causes of crop yield loss. Drought stress has been often labelled as "complex trait" by genetics (Blum, 2011). Morphological variations are positively associated with genetic diversity but are also dependent on environmental factors, as well as, on the interaction between genotypes and environment (Moose and Mumm, 2008).…”

Section: Introductionmentioning

confidence: 99%

Agro-morphological and Molecular Characterization of Sorghum (Sorghum vulgare L.) for Water Stress Tolerance

Khatab¹,

El-Mouhamady²,

Abdel-Rahman³

et al. 2017

Int. J. Curr. Res. Biosci. Plant Biol.

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A b s t r a c t A r t i c l e I n f oThe present investigation was designed to study the genetic component in 23 entries of sorghum (eight parents and 15 their cross) using line × tester design under water stress. Moreover, to assess genetic diversity and find marker(s) that could be related to drought tolerance. Genotypes (PI534175), (CD550190), (CPI456765 × PI534175), (CP1987656 × PI534175), (Dorado × PI534175) (CPI456765 × CD550190), (CP1987656 × CD550190) and (Hybrid Shadwell 2 × CD550190) were the best under water deficit conditions compared with the control for most evaluated genetic parameters for important traits. Genetic diversity among selected 11 sorghum entries (8 parents and the best three crosses) were evaluated using eleven primers (six for RAPD and six for SRAP). Fifty and thirty two total bands were detected for SRAP and RAPD whereas, 27 and 29 were polymorphic respectively. Unfortunately, from RAPD primers the banding patterns could not be able to generate any marker linked to water stress among the parents and their hybrids. Moreover, SRAP primers generated polymorphic bands, ranged between 20.60% (primer me1+em3), with the lowest band number (five bands only) to 80.0% for (primer me2+em3), generated the highest band number (11 bands), which generate specific band with size 470 bp in parental genotypes (CPI456765) and (CD550190) which could be transmuted to the hybrids (CPI456765 × CD550190) and (Hybrid Shadwell2 × CD550190). This band could be considered as linked to hybrid vigor and drought stress tolerance. Phylogenetic tree using SRAP divided the tolerant parents and their hybrid in closed clusters.

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Drought Resistance and Its Improvement

Cited by 48 publications

References 410 publications

Does the turgor loss point characterize drought response in dryland plants?

Does the turgor loss point characterize drought response in dryland plants?

Impact of nitrogen supply on leaf water relations and physiological traits in a set of potato (Solanum tuberosumL.) cultivars under drought stress

Agro-morphological and Molecular Characterization of Sorghum (Sorghum vulgare L.) for Water Stress Tolerance

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