GROWTH, NUTRITION AND GAS EXCHANGE OF <i>BROMUS INERMIS</i> INOCULATED WITH <i>GLOMUS FASCICULA TUM</i>

Bildusas, I. J.; Dixon, Ross; Pfleger, F. L.; Stewart, Elwin L.

doi:10.1111/j.1469-8137.1986.tb00585.x

Cited by 38 publications

(15 citation statements)

References 35 publications

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“…Improved P nutrition is not always sufficient, however, to explain the effects of VA mycorrhizas on host physiology (Gianinazzi-Pearson & Gianinazzi, 1983). Recently, several associations have been identified in which mycorrhizal modification of water relations under well-watered (Hardie, 1985;Auge et al, 1986a) and drought (Bildusas et al, 1986;Bethlenfalvay et al, 1987Bethlenfalvay et al, , 1988Davies, Potter & Linderman, 1989) conditions occurs independently of P status. In rose leaves.…”

Section: Discussionmentioning

confidence: 99%

An apparent increase in symplastic water contributes to greater turgor in mycorrhizal roots of droughted Rosa plants*

Augé

Stodola

1990

New Phytologist

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SUMMARYUsing psychrometric pressure-volume analysis, root water relations following drought were characterized in Rosa hybrida L. plants colonized by the vesicular-arbuscular mycorrhizal fungus Glomus intraradices Schenck & Smith. Measurements were also made on uncolonized plants of similar size and adequate phosphorus nutrition. Under well-watered conditions mycorrhizal colonization resulted in lower solute concentrations in root symplasm, and hence lower root turgors. Following drought, however, mycorrhizal roots maintained greater turgor across a range of tissue hydration. This effect was apparently not due to increased osmotic adjustment (osmotic potentials at full turgor were similar in mycorrhizal and non-mycorrhizal roots after drought) or to altered elasticity but to an increased partitioning of water into the symplast. Symplast osmolality at full turgor was similar in mycorrhizal and non-mycorrhizal roots but, because of their higher symplastic water percentages, mycorrhizal roots contained a greater amount of osmotic (symplastic) solutes. Drought-induced changes in osmotic potential were observed only in mycorrhizal roots, where a 04 MPa decrease (relative to well-watered controls) brought the full turgor osmotic potential of mycorrhizal roots to the same level as that of non-mycorrhizal roots under either watering treatment.

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Section: Discussionmentioning

confidence: 99%

An apparent increase in symplastic water contributes to greater turgor in mycorrhizal roots of droughted Rosa plants*

Augé

Stodola

1990

New Phytologist

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“…2). Others have also found higherX^ and or^^.. in M than NM plants grown under well watered conditions (Auge et al, 1986a;Bildusas et al, 1986;Auge, 1989) and droughted conditions (Eaber et al, 1991 ;Davies et al, 1993), even when M and NM plants were similar in size and had adequate tissue P. Therefore, regardless of plant nutrition, at certain times under various environmental conditions, mycorrhizas might affect direct measurements of X,. ^nd ^,^.^..…”

Section: Discussionmentioning

confidence: 99%

Growth, phosphorus uptake, and water relations of safflower and wheat infected with an arbuscular mycorrhizal fungus

Bryla

Duniway

1997

New Phytologist

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SafHower (Carthamus tinctorius L. cv. S5S5) and spring wheat {Triticiim aestivum L. cv. Anza) were grown with or without the arbuscular mycorrhizal fungus Glortius ettinicatum Becker & Gerd., under environmentally controlled conditions. Soil phosphate concentrations were adjusted before planting to produce mycorrhizal (M) and non-mycorrhizal (NM) plants that had similar leaf areas and root length densities at the same stage of development before initiating drought stress treatments. Drought did not afTect the amount of mycorrhizal infection in safflower or wheat. Interactions between water stress treatments and mycorrhizal infection on plant growth and phosphorus uptake were limited and only occurred in wheat. NM wheat plants had 28 °o greater shoot d. wt, slightly greater root length densities, and 39 °" greater P acquisition than M plants when grown under well watered conditions, but under droughted conditions plant size and tissue P contents of M and NM wheat plants were similar. Mycorrhizas did not afTect stomatal behaviour during drought stress in either safflower or wheat, i.e., transpiration and stomatal conductance declined independently of infection as soil water was depleted and leaf water potentials declined. Therefore, mycorrhizal infection did not alter the intrinsic hydraulic properties of the plant/soil system. Whilst wheat maintained turgor of recently expanded leaves during severe drought and safflower did not, mycorrhizal infection had no effect on leaf turgor during drought in either plant species.

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“…Both effects have been observed before in other Glomus spp. in response to low soil moisture levels (3,6,22).…”

Section: Methodsmentioning

confidence: 99%

Osmotic Adjustment in Leaves of VA Mycorrhizal and Nonmycorrhizal Rose Plants in Response to Drought Stress

Augé¹,

Schekel²,

Wample³

1986

Plant Physiol.

139

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ABSTRACIOsmotic adjustment in Rosa hybrida L. cv Samantha was characterized by the pressure-volume approach in drought-acclimated and unacclimated plants brought to the same level of drought strain, as assayed by stomatal closure. Plants were colonized by either of the vesicular-arbuscular mycorrhizal fungi Glomus deserticola Trappe, Bloss and Menge or G. intraradices Schenck and Smith, or were nonmycorrhizal. Both the acclimation and the mycorrhizal treatments decreased the osmotic potential (*,P) of leaves at full turgor and at the turgor loss point, with a corresponding increase in pressure potential at full turgor. Mycorrhizae enabled plants to maintain leaf turgor and conductance at greater tissue water deficits, and lower leaf and soil water potentials, when compared with nonmycorrhizal plants. As indicated by the *i',, at the turgor loss point, the active *I. depression which attended mycorrhizal colonization alone was 0.4 to 0.6 megapascals, and mycorrhizal colonization and acclimation in concert 0.6 to 0.9 megapascals, relative to unacclimated controls without mycorrhizae. Colonization levels and sporulation were higher in plants subjected to acclimation. In unacclimated hosts, leaf water potential, water saturation deficit, and soil water potential at a particular level of drought strain were affected most by G. intraradices. G. deserticola had the greater effect after drought preconditioning.Recent evidence suggests that colonization of root systems by VA2 mycorrhizal fungi affords host plants greater resistance to drought stress3 (2,22). Mycorrhizal plants may avoid drought to some extent through enhanced water uptake at low soil moisture levels (26). In onion the effect appears to be conferred through improved phosphorus nutrition (22) 'The terminology of Levitt (18) has been employed throughout this paper in distinguishing an environmental limitation ('stress') from the related plant response to the limitation ('strain).potential has been observed in wheat (2); however, definitive studies on osmotic adjustment in mycorrhizal plants are lacking. The influence of drought-acclimation and mycorrhizal colonization on tissue water relations and osmotic response in equally sized and adequately P-nourished rose plants is reported in this study. As drought may modify the partitioning of water into apoplastic and symplastic fractions (24), parameters for estimating these fractions were also calculated. MATERIALS AND METHODS

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GROWTH, NUTRITION AND GAS EXCHANGE OF BROMUS INERMIS INOCULATED WITH GLOMUS FASCICULA TUM

Cited by 38 publications

References 35 publications

An apparent increase in symplastic water contributes to greater turgor in mycorrhizal roots of droughted Rosa plants*

An apparent increase in symplastic water contributes to greater turgor in mycorrhizal roots of droughted Rosa plants*

Growth, phosphorus uptake, and water relations of safflower and wheat infected with an arbuscular mycorrhizal fungus

Osmotic Adjustment in Leaves of VA Mycorrhizal and Nonmycorrhizal Rose Plants in Response to Drought Stress

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