Yield and Water Use Efficiency (WUE) of Avena sativa as Influenced by Vesicular Arbuscular Mycorrhizae (VAM)

Khan, Irshad Ahmad; Mirza, Sarwat N.; Ayub, Najma; Nizami, M. I.

doi:10.3923/ajps.2003.371.373

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…It is interesting to highlight how the mycorrhizal symbiosis has increased the water use efficiency of plants grown in conditions of saline stress, but only when the plants were grown in conditions of adequate N availability, highlighting once again how the effects of mycorrhization are N driven oriented. Several reports show an increase in plant WUE by the AM symbiosis under osmotic stress conditions [60][61][62]. This is related to the ability of mycorrhized plants to accumulate solutes (making possible an adjustment of the osmotic potential), an increase in stomatal conductance, an increase in transpiration and a greater photosynthetic efficiency [63][64][65] but also by leaf morphological traits as specific leaf weight or leaf area ratio [66], parameters that were favourably influenced by mycorrhization in this research.…”

Section: Discussionsupporting

confidence: 58%

Nitrogen Availability Drives Mycorrhizal Effects on Wheat Growth, Nitrogen Uptake and Recovery under Salt Stress

et al. 2022

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The arbuscular mycorrhizal (AM) symbiosis is generally considered effective in improving salt tolerance in plants; however, the advantages it offers can vary greatly depending on the context in which it occurs; furthermore, the mechanisms underlying these responses are still unclear. A study was conducted to investigate the role of nitrogen (N) availability on the effectiveness of AM symbiosis in durum wheat (Triticum durum Desf.) plants grown under salt stress. Plants were grown in pots in the absence or in presence of salt stress (soil electrical conductivity of 1.50 and 13.00 dS m−1, respectively), with or without AM fungi inoculation (Rhizophagus irregularis and Funneliformis mosseae), varying the N dose supplied (0 or 80 mg N per pot). Results indicate that AM symbiosis can alleviate the detrimental effects of salt stress on the growth of durum wheat only when plants are grown under sufficient N availability in soil; in such conditions mycorrhizal symbiosis determined an improvement of leaf traits (leaf area, SLA, stability of plasma membranes and SPAD), N uptake, N fertilizer recovery and water use efficiency. On the contrary, when wheat plants were grown in conditions of N deficiency, the mycorrhizal symbiosis had no effect (under salt stress) or even depressive effect (under unstressed condition) on plant growth and N uptake, highlighting how, in some cases, competition for nutrients between plants and AM can arise. This study suggests that N availability in the soil can drive the effects of AM symbiosis in assisting the plant with containing saline stress.

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Section: Discussionsupporting

confidence: 58%

Nitrogen Availability Drives Mycorrhizal Effects on Wheat Growth, Nitrogen Uptake and Recovery under Salt Stress

et al. 2022

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“…Moreover, when the soil water content was 50% of available water, the mycorrhizal plant dry weight was 150% of the weight of non-mycorrhizal plants. This effect of mycorrhiza on the growth of corn seedlings is more effective than its impact on the growth of other plants such as peach and Avena sativa (Khan et al, 2003). The fresh weight and the dry weight of mycorrhizal plants grown under the condition of 20% of available water were not significantly different from the weights of non-mycorrhizal plants grown in that of 30% and 40% water content.…”

Section: Resultsmentioning

confidence: 83%

“…Non Mycorrhiza treatments received the same quantity of autoclaved inoculums. (Khan et al, 2003) Inoculum (50g) was consisted of external mycelium, spores and colonized roots mixed with soil. Five of corn seeds were sown in each pot.…”

Section: Methodsmentioning

confidence: 99%

Effects of Glomus intraradices on the drought resistance and growth of corn plant (Zea mays L.)

Banni

Hajomer

Tayeb

et al. 2017

MJSc

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A pot experiment was carried out at the greenhouse of Faculty of Agriculture (Saba bacha), Alexandria University. The experiment was conducted to investigate the role of Glomus intraradices fungi in the effects on the growth and water requirement of pot-grown corn (Zea mays L.). Four water regimes (20%, 30%, 40% and 50% of the available soil water content) were conducted. The Arbuscular Mycorrhizal Fungi AMF inoculation could significantly increase plant growth (including plant height, leaf area, and fresh and dry mass), enhance relative leaf water content, transpiration rates and stomatal conductance, and improve plant drought tolerance. The water consumption of the mycorrhizal plants producing 1 g of dry matter was 20%–35% of water content conditions. These findings indicate that the mycorrhizae enhanced the water utilization efficiency.

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“…These soil microorganisms form symbiotic associations with an estimate of 72% of land plant species (Brundrett and Tedersoo, 2018) and have been suggested as promising root-associates for drought mitigation in plants (Boomsma and Vyn, 2008) via several mechanisms. For instance, improved cell turgor via osmotic adjustment in shoots (Wu and Xia, 2006), neutralization of reactive oxygen species in tissues via the synthesis of enzymes (e.g., superoxide dismutase) (Ruiz-Lozano et al, 1996), the increased access to soil pores inaccessible to roots or root hairs (Smith and Read, 2008) and transport of water via the extraradical mycelium to the root cells (Sánchez-Díaz and Honrubia, 1994; Ahmad Khan et al, 2003), the enhanced water uptake in plants by stimulating the growth of root hairs (Zou et al, 2017) and by increasing root hydraulic conductivity through modulation of root aquaporin expression (Bárzana et al, 2012; Quiroga et al, 2018) have been reported [for details see reviews of Lenoir et al (2016) and Plouznikoff et al (2016)]. Remarkably, in inorganic P (Pi) limiting soils, AMF can ameliorate P nutrition of plants by accessing to remote locations of Pi through their extraradical hyphae (Smith and Read, 2008) and it has been demonstrated that this improved Pi nutrition can maintain optimal growth and water relations and therefore increase plant resistance to drought (Nelsen and Safir, 1982; Fitter, 1988; Augé, 2001).…”

Section: Introductionmentioning

confidence: 99%

Rhizophagus irregularis MUCL 41833 Improves Phosphorus Uptake and Water Use Efficiency in Maize Plants During Recovery From Drought Stress

et al. 2019

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Irregular precipitations are likely to affect maize production in the future. Arbuscular mycorrhizal fungi (AMF) have been reported to increase maize resistance to drought, but their role on the short-term inorganic phosphorus (Pi) uptake, leaf gas exchange parameters and water content during recovery after drought remains poorly understood. Here, we investigated these parameters in maize plants colonized or not by Rhizophagus irregularis MUCL 41833. The mycorrhizal (M) and non-mycorrhizal (NM) plants were grown for a 3-week period in a circulatory semi-hydroponic cultivation system and were submitted to well-, moderately-, or poorly-watered conditions (WW, MW, and PW, respectively), the two latter conditions corresponding to moderate and severe droughts. The plants were then watered at field capacity for 42 h with a Pi impoverished Hoagland nutrient solution and the dynamic of Pi depletion in the nutrient solution, corresponding to Pi uptake/immobilization by the maize-AMF associates, was evaluated at 0, 9, 21, and 42 h. The CO 2 assimilation rate (A), stomatal conductance (g s ), transpiration (E), and instantaneous water use efficiency (WUE i ) were also assessed at 0 and 42 h of circulation. Plant biomass, plant water content, phosphorus concentration and content, and leaf relative water content were evaluated at harvest. During recovery, Pi uptake was significantly higher in M versus NM plants whatever the water regime (WR) applied before recovery. AMF did not affect leaf gas exchange parameters before recovery but modulated g s and E, and improved WUE i after 42 h of recovery. At harvest, no significant difference in dry biomass was found between M and NM plants but shoot fresh weight was significantly higher in M plants. This resulted in an increased shoot water content in M plants grown in the MW and PW treatments. Surprisingly, leaf relative water content was significantly lower in M plants when compared with NM plants. Finally, P content and concentration were significantly higher in roots but not in shoots of M plants. Our results suggested that AMF can play a role in drought resistance of maize plants by increasing the Pi uptake and WUE i during recovery after drought stress.

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Yield and Water Use Efficiency (WUE) of Avena sativa as Influenced by Vesicular Arbuscular Mycorrhizae (VAM)

Cited by 11 publications

References 11 publications

Nitrogen Availability Drives Mycorrhizal Effects on Wheat Growth, Nitrogen Uptake and Recovery under Salt Stress

Nitrogen Availability Drives Mycorrhizal Effects on Wheat Growth, Nitrogen Uptake and Recovery under Salt Stress

Effects of Glomus intraradices on the drought resistance and growth of corn plant (Zea mays L.)

Rhizophagus irregularis MUCL 41833 Improves Phosphorus Uptake and Water Use Efficiency in Maize Plants During Recovery From Drought Stress

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