Effects of water stress on leaf growth in tall fescue, Italian ryegrass and their hybrid: rheological properties of expansion zones of leaves, measured on growing and killed tissue

Thomas, Hugh; James, A.R.; Humphreys, M. W.

doi:10.1093/jxb/50.331.221

Cited by 17 publications

(9 citation statements)

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“…Lower specific leaf area observed when increasing water stress, as found in our study, was also reported for other grasses [37]. This behaviour could be explained by the reduction of leaf area as a consequence of the inhibition of cell expansion determined by the loss of turgidity and/or elasticity of the cell wall [17, 32, 39]. Up to the first 45 days, smaller cells would be more able to maintain leaf turgidity and photosynthetic activity under severe water stress [27].…”

Section: Discussionsupporting

confidence: 88%

“…Increases in water stress determined restrictions to dry matter variables (number and weight of tillers, and length, width and area of leaves). The reduction of leaf size is an early response to water deficit, determined by a lower cell expansion rate [17, 32, 37–39]. In this study, leaf and tiller sizes diminished remarkably with the reduction of water levels, similarly to that reported for other grasses [27, 33–34, 40].…”

Section: Discussionsupporting

confidence: 84%

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Morpho-physiological responses of tall wheatgrass populations to different levels of water stress

2018

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Tall wheatgrass [Elymus elongatus subsp. ponticus (Podp.) Melderis] is a perennial forage grass cultivated in dry, saline or alkaline environments. The morpho-physiological characteristics of four populations of tall wheatgrass from different climatic-edaphic origins were evaluated under three conditions of water stress (100%-50%-30% of field capacity). The trial was analyzed with three replicates and two-factor ANOVA in pots within the greenhouse during 35 days. Only dry matter and tiller number showed interaction between populations and water conditions. The most relevant changes in morpho-physiological parameters under strong water stress were reduced dry matter production (48–32% differing among populations), smaller leaf and tiller size (46% and 28%), together with higher water use efficiency (74%), and increased proline and protein contents (144% and 71%), smaller tiller number (30–11% differing among populations) and a slight decrease in leaf water content (3%). The populations differed in growth strategies and morpho-physiological mechanisms to survive water stress, which could be related to their habitat background. The study shows the stability in dry matter production under all levels of water stress, which can be related to the higher tiller number. Due to this plasticity, tall wheatgrass should be studied as a species with great potential to adapt to drought stress.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 84%

Morpho-physiological responses of tall wheatgrass populations to different levels of water stress

2018

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“…It is well known that LER values are affected by numerous external factors, including temperature (Van Esbroeck et al ., 1989; Belanger, 1996), nitrogen (Belanger, 1998), water status (Thomas et al ., 1999) and, to a lesser degree, daylength (Van Esbroeck et al ., 1989) and the developmental state of the tiller (Parsons and Robson, 1980; Brereton et al ., 1985). Based on the parameter estimates of selected models in this experiment, air temperature and daylength had a stronger effect on timothy than on meadow fescue.…”

Section: Discussionmentioning

confidence: 99%

Leaf dynamics of timothy and meadow fescue under Nordic conditions

Virkajärvi¹,

Järvenranta²

2001

Grass and Forage Science

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Leaf production dynamics of timothy (Phleum pratense L. cv. Tarmo) and meadow fescue (Festuca pratensis Huds. cv. Kalevi) were studied in Finland under field conditions in mixed swards containing timothy, meadow fescue and red clover (Trifolium pratense L. cv. Björn) harvested by cutting. Fifteen randomly selected tillers of both species were marked and leaf number, leaf appearance rate (LAR), leaf elongation rate (LER), leaf senescence rate (LSR) and leaf live span (LLS) were followed through weekly observations. Concurrently another set of fifteen tillers of each species was dissected on each occasion to determine the number of unemerged leaves and development stage of the apex. The first observation period was between 26 April and 22 June and the second between 22 July and 22 September. The species differed clearly for most of the measured parameters but most differences were dependent on the season. In spring, timothy started growth earlier, had higher LAR (+57%), produced more leaves (+83%) with higher LERgross (+58%), higher LSR (+61%), higher LERnet (+54%) and produced larger tillers (+193% in leaf area) than meadow fescue. In autumn, timothy still had a higher LAR (+80%), produced more leaves (+60%) with higher LERgross (+36%), but had also a higher LSR (+77%) and thus similar LERnet (0%) to meadow fescue. Timothy tillers were only slightly larger than meadow fescue tillers (+20% in leaf area). The consequences of these findings on competition in mixed swards and implications for grazing theories are discussed.

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“…2004; Pasternak et al. 2005a; Verma & Mishra 2005) as well as the microscopic level (Thomas, James & Humphreys 1999; Neves‐Piestun & Bernstein 2001; Ortega & Taleisnik 2003; Pasternak et al. 2005a,b).…”

Section: Simr – a Cellular Viewmentioning

confidence: 99%

Different stresses, similar morphogenic responses: integrating a plethora of pathways

Potters

Pasternak

Guisez

et al. 2009

Plant Cell & Environment

329

216

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Exposure of plants to mild chronic stress can cause induction of specific, stress-induced morphogenic responses (SIMRs). These responses are characterized by a blockage of cell division in the main meristematic tissues, an inhibition of elongation and a redirected outgrowth of lateral organs. Key elements in the ontogenesis of this phenotype appear to be stress-affected gradients of reactive oxygen species (ROS), antioxidants, auxin and ethylene. These gradients are present at the the organismal level, but are integrated on the cellular level, affecting cell division, cell elongation and/or cell differentiation. Our analysis of the literature indicates that stress-induced modulation of plant growth is mediated by a plethora of molecular interactions, whereby different environmental signals can trigger similar morphogenic responses. At least some of the molecular interactions that underlie morphogenic responses appear to be interchangeable. We speculate that this complexity can be viewed in terms of a thermodynamic model, in which not the specific pathway, but the achieved metabolic state is biologically conserved.

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Effects of water stress on leaf growth in tall fescue, Italian ryegrass and their hybrid: rheological properties of expansion zones of leaves, measured on growing and killed tissue

Cited by 17 publications

References 0 publications

Morpho-physiological responses of tall wheatgrass populations to different levels of water stress

Morpho-physiological responses of tall wheatgrass populations to different levels of water stress

Leaf dynamics of timothy and meadow fescue under Nordic conditions

Different stresses, similar morphogenic responses: integrating a plethora of pathways

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