Primary responses of root and leaf elongation to water deficits in the atmosphere and soil solution

Frensch, Jürgen

doi:10.1093/jxb/48.5.985

Cited by 68 publications

(79 citation statements)

References 69 publications

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“…4 Dendrogram based on relative values of ten morphological and physiological parameters of growth of potato lines under drought number of leaves, total area of leaves, number of roots, length and thickness of roots, fresh and dry weight, and water content due to drought with variation among lines for these traits. These results agree with other studies reporting decreased leaf number and plant water potentials (Frensh 1997), leaf area, stem height, growth and yield, canopy radiation interception and tuber dry matter concentration under drought (Schittenhelma et al 2006;Sanchez-Rodriguez et al 2010). …”

Section: Discussionsupporting

confidence: 93%

In vitro screening of potato lines for drought tolerance

Al-Biski

Najla

Sanoubar

et al. 2012

Physiol Mol Biol Plants

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Fresh water resources are limited and their use in agricultural production is expected to come under increasing constraints. Eighteen Syrian lines of potato (Solanum tuberosum L.) were screened for drought tolerance by measuring aerial and root growth in vitro. Drought stress was evaluated by adding 2, 4, 6, 8 and 10 % (w:v) of sorbitol to MurashigeSkoog medium and compared to 0 % for the control. Water potential of media ranged from −0.58 MPa to −2.5 MPa. Water-stress in culture adversely affected plant growth, and genotypes differed for their responses. Plant length and stem thickness, leaf area, root number length and thickness, and plant fresh and dry weights and plant water content were measured and all decreased due to drought. Grouping lines by cluster analysis for response to drought resulted in: (1) a tolerant group of six lines, (2) a moderately tolerant group of seven lines, and (3) a susceptible group of five lines. The variation in germplasm indicated that potato varieties can be developed for production under some levels of drought.

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Section: Discussionsupporting

confidence: 93%

In vitro screening of potato lines for drought tolerance

Al-Biski

Najla

Sanoubar

et al. 2012

Physiol Mol Biol Plants

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“…Water deficit strongly decreases the number of leaves, plant water potential (Frensch 1997), leaf area, stem height, ground coverage, canopy radiation interception, number of tubers, growth and yield. In contrast, effects of water stress on radiation use efficiency, harvest index and tuber dry matter concentration (Schittenhelma et al 2005) and on nitrate reductase (Foyer et al 1998;Chandra et al 2004;Das et al 2005;Kar et al 2005;Xu and Guang 2006) are relatively small.…”

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confidence: 99%

Evaluation of Potato Cultivars for Resistance Against Water Deficit Stress Under In Vivo Conditions

Hassanpanah¹

2010

Potato Res.

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Water deficit is the most important abiotic stress factor in crop production. Evaluation of the response of different potato cultivars to water deficit stress is necessary to release cultivars for regions with water deficit. A split-plot experiment with three replications was carried out during 2005 and 2006. The main factor consisted of three levels of irrigation (irrigation after 25%, 35% and 50% discharge of the available water, i.e. normal conditions, mild stress and severe stress, respectively), and the split factor included seven potato cultivars (Agria, Savalan, Satina, Caesar, Kennebec, Marfona and Santé). Cultivars Savalan, Caesar and Kennebec had higher total and marketable tuber yield, water use efficiency, and values for stress tolerance indices than the other cultivars, both under mild and severe stress conditions. Cultivars Caesar and Kennebec were selected as tolerant cultivars; cultivars Savalan and Satina were identified as moderately tolerant cultivars whereas cultivars Agria, Marfona and Santé proved to be susceptible to water deficit.

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“…The root hydraulic conductance based on the root surface area (also referred to as the root hydraulic conductivity [L P ]) thus has a major influence on the shoot water status, and, in turn, on plant growth and development (Frensch, 1997). Water moves from the surface of a root to the root xylem through a series of tissues, each with a hydraulic conductance that can change with root development (Melchior and Steudle, 1993) and with the availability of soil moisture (North and Nobel, 1996).…”

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confidence: 99%

Hydraulic Conductance and Mercury-Sensitive Water Transport for Roots of Opuntia acanthocarpa in Relation to Soil Drying and Rewetting

2001

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Drought-induced changes in root hydraulic conductance (L P ) and mercury-sensitive water transport were examined for distal (immature) and mid-root (mature) regions of Opuntia acanthocarpa. During 45 d of soil drying, L P decreased by about 67% for distal and mid-root regions. After 8 d in rewetted soil, L P recovered to 60% of its initial value for both regions. Axial xylem hydraulic conductivity was only a minor limiter of L P . Under wet conditions, HgCl 2 (50 m), which is known to block membrane water-transport channels (aquaporins), decreased L P and the radial hydraulic conductance for the stele (L R, S ) of the distal root region by 32% and 41%, respectively; both L P and L R, S recovered fully after transfer to 2-mercaptoethanol (10 mm). In contrast, HgCl 2 did not inhibit L P of the mid-root region under wet conditions, although it reduced L R, S by 41%. Under dry conditions, neither L P nor L R, S of the two root regions was inhibited by HgCl 2 . After 8 d of rewetting, HgCl 2 decreased L P and L R, S of the distal region by 23% and 32%, respectively, but L P and L R, S of the mid-root region were unaltered. Changes in putative aquaporin activity accounted for about 38% of the reduction in L P in drying soil and for 61% of its recovery for the distal region 8 d after rewetting. In the stele, changes in aquaporin activity accounted for about 74% of the variable L R, S during drought and after rewetting. Thus, aquaporins are important for regulating water movement for roots of O. acanthocarpa.

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Primary responses of root and leaf elongation to water deficits in the atmosphere and soil solution

Cited by 68 publications

References 69 publications

In vitro screening of potato lines for drought tolerance

In vitro screening of potato lines for drought tolerance

Evaluation of Potato Cultivars for Resistance Against Water Deficit Stress Under In Vivo Conditions

Hydraulic Conductance and Mercury-Sensitive Water Transport for Roots of Opuntia acanthocarpa in Relation to Soil Drying and Rewetting

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