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Journal of Arid Land
Journal of Arid Land  2023, Vol. 15 Issue (6): 740-755    DOI: 10.1007/s40333-023-0015-6     CSTR: 32276.14.s40333-023-0015-6
Research article     
Improved drought tolerance in Festuca ovina L. using plant growth promoting bacteria
Fateme RIGI, Morteza SABERI(), Mahdieh EBRAHIMI
Department of Range and Watershed Management, Faculty of Water and Soil, University of Zabol, Zabol 9861335856, Iran
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Abstract  

Numerous ecological factors influence a plant's ability to live and grow, in which dryness is a substantial constraint on plant growth in arid and semi-arid areas. In response to a specific environmental stress, plants can use the most effective bacteria to support and facilitate their growth and development. Today, plant growth promoting rhizobacteria (PGPR) is widely used to reduce drought stress on plant growth. In this study, the effects of drought on Festuca ovina L. germination, growth, and nutrient absorption were investigated using PGPR in a factorial test with a completely random design under four water regimes. Soil water content was kept at 100% FC (field capacity), 70% FC (FC), 50% FC, and 30% FC. The treatments were inoculated with Azotobacter vinelandii, Pantoea agglomerans+Pseudomonas putida, and a mixture of bio-fertilizers. Results showed that the effects of drought stress were significantly reduced (P<0.05) when A. vinelandii and P. agglomerans+P. putida were used separately, however, the combined treatment of bio-fertilizers had a greater influence on seed germination than the single application. P. agglomerans+P. putida under 30% FC condition resulted in higher increases in stem, root length, and plant dry biomass. The highest uptake of nutrients was observed for the combined treatment of bio-fertilizers under 30% FC condition. Therefore, the use of A. vinelandii and P. agglomerans+P. putida, applied separately or combined, increased tolerance to drought stress in F. ovina by increased germination indices, dry weight, stem length, and root length. Because of the beneficial effects of PGPR on the growth characteristics of plants under drought conditions and the reduction of negative effects of drought stress, inoculating F. ovina seeds with Azotobacter and Pseudomonas is recommended to improve their growth and development characteristics under drought conditions. PGPR, as an affordable and environmentally friendly method, can improve the production of forage in water-stress rangelands.

Key words： bio-fertilizers      element uptake      drought stress      rangeland      water scarcity     
Received: 02 December 2022      Published: 30 June 2023
Corresponding Authors: * Morteza SABERI (E-mail: Mortezasaberi@uoz.ac.ir)
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Fateme RIGI
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Fateme RIGI, Morteza SABERI, Mahdieh EBRAHIMI. Improved drought tolerance in Festuca ovina L. using plant growth promoting bacteria. Journal of Arid Land, 2023, 15(6): 740-755.

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http://jal.xjegi.com/10.1007/s40333-023-0015-6     OR     http://jal.xjegi.com/Y2023/V15/I6/740

Soil texture EC (dS/m) pH TN (%) TP (mg/kg) SOM (%) K (mg/kg)
Loamy 0.21 5.30 0.20 18.34 1.94 630
Table 1 Soil characteristics used for plant cultivation
GP (%) GR (numbers/d) Treatment
87.29±4.15a 20.20±0.60a 100% FC
80.39±4.15b 18.22±0.60b 70% FC
75.12±3.25c 15.15±0.50c 50% FC
60.12±3.65d 12.21±0.50d 30% FC
95.63±5.00b 24.22±0.70b A
95.33±5.00b 24.09±0.70b S
100.00±5.12a 26.59±0.71a AS
89.00±4.00c 18.92±0.50c N'
95.77±4.90a 23.13±0.70b A+100% FC
96.88±4.90a 24.53±0.72a A+70% FC
96.97±4.90a 24.60±0.72a A+50% FC
83.13±3.44b 18.21±0.60c A+30% FC
95.12±5.00a 22.00±0.72b S+100% FC
96.13±5.00a 24.20±0.72a S+70% FC
97.65±5.23a 24.07±0.70a S+50% FC
81.32±4.17b 17.71±0.50c S+30% FC
96.00±6.50b 24.67±0.80b AS+100% FC
97.40±5.00b 24.86±0.80ab AS+70% FC
97.89±5.00b 24.89±0.80ab AS+50% FC
99.62±3.40a 25.16±0.80a AS+30% FC
85.10±4.80a 19.10±0.50a N'+100% FC
79.10±4.50b 17.11±0.40b N'+70% FC
74.12±4.50b 14.06±0.40c N'+50% FC
62.10±4.50c 13.12±0.40c N'+30% FC
Table 2 Drought and bio-fertilizers effects on GR and GP of Festuca ovina
Aerial dry weight (mg) Root dry weight (mg) Stem length (cm) Root length (cm) Treatment
1.90±0.00a 0.92±0.00a 11.33±0.40a 9.09±0.30a 100% FC
1.80±0.00b 0.82±0.00b 9.80±0.40b 7.11±0.30b 70% FC
1.65±0.00c 0.65±0.06c 7.40±0.40c 5.18±0.20c 50% FC
0.92±0.00d 0.50±0.00d 5.27±0.20d 4.23±0.10d 30% FC
2.67±0.02b 0.67±0.02b 13.29±0.51b 11.33±0.30b A
2.75±0.02ab 0.75±0.02ab 13.87±0.51b 11.62±0.30b S
3.24±0.02a 1.55±0.02a 15.34±0.60a 13.10±0.30a AS
1.23±0.01b 1.42±0.02b 11.14±0.40c 9.21±0.30c N'
2.25±0.02c 0.73±0.01c 13.40±0.60c 11.13±0.41c A+100% FC
2.60±0.02b 0.89±0.01b 14.85±0.60b 12.44±0.41b A+70% FC
2.89±0.02a 0.96±0.01a 15.60±0.60a 13.32±0.41a A+50% FC
0.92±0.00d 0.64±0.01d 10.57±0.40d 8.22±0.30d A+30% FC
2.30±0.03b 0.84±0.00b 13.92±0.60b 11.24±0.45b S+100% FC
2.69±0.03a 1.23±0.02a 14.11±0.60a 12.62±0.45a S+70% FC
2.83±0.03a 1.32±0.02a 14.73±0.60a 12.96±0.55a S+50% FC
2.96±0.03a 1.41±0.02a 14.80±0.60a 12.67±0.55a S+30% FC
3.56±0.03d 2.46±0.03d 15.96±0.60d 13.24±0.55d AS+100% FC
3.77±0.03c 2.65±0.03c 16.92±0.62c 14.35±0.60c AS+70% FC
4.50±0.03b 3.20±0.03b 17.86±0.62b 15.76±0.60b AS+50% FC
4.96±0.03a 3.86±0.03a 19.88±0.70a 17.43±0.60a AS+30% FC
1.65±0.03a 0.89±0.01a 11.43±0.40a 9.66±0.45a N'+100% FC
0.93±0.03b 0.76±0.01b 9.31±0.40b 7.42±0.45b N'+70% FC
0.76±0.00c 0.56±0.01c 8.10±0.40c 6.76±0.35c N'+50% FC
0.61±0.00c 0.43±0.01c 7.14±0.40d 6.12±0.35c N'+30% FC
Table 3 Morphological traits of Festuca ovina under drought stress and bio-fertilizers
Fig. 1 Impact of drought stress (a), bio-fertilizers (b), and interaction effect between bio-fertilizers and drought stress (c) on absorption of nitrogen (N) and phosphorous (P). Bars are standard errors. A, A. vinelandii; S, P. agglomerans+P. putida; AS, A. vinelandii+P. agglomerans+P. putida; N', no inoculation; FC, field capacity. Different lowercase letters within different treatments in Figure 1a and b indicate significant differences at P<0.05 level for N or P. Different lowercase letters within the same bacterial and different FC treatments in Figure 1c indicate significant differences at P<0.05 level for N or P.
Fig. 2 Impact of drought stress (a), bio-fertilizers (b), and interaction effect between bio-fertilizers and drought stress (c) on absorption of potassium (K) and manganese (Mn). Bars are standard errors. A, A. vinelandii; S, P. agglomerans+P. putida; AS, A. vinelandii+P. agglomerans+P. putida; N', no inoculation; FC, field capacity. Different lowercase letters within different treatments in Figure 2a and b indicate significant differences at P<0.05 level for K or Mn. Different lowercase letters within the same bacterial and different FC treatments in Figure 2c indicate significant differences at P<0.05 level for K or Mn.
Fig. 3 Impact of drought stress (a), bio-fertilizers (b), interaction effect between bio-fertilizers and drought stress (c) on absorption of iron (Fe) and zinc (Zn). Bars are standard errors. A, A. vinelandii; S, P. agglomerans+P. putida; AS, A. vinelandii+P. agglomerans+P. putida; N', no inoculation; FC, field capacity. Different lowercase letters within different treatments in Figure 3a and b indicate significant differences at P<0.05 level for Fe or Zn. Different lowercase letters within the same bacterial and different FC treatments in Figure 3c indicate significant differences at P<0.05 level for Fe or Zn.
Fig 4 Mechanism of plant growth-promoting bacteria under drought stress
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