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Agronomic traits, secondary metabolites and element concentrations of Lavandula angustifolia leaves as a response to single or reiterated drought stress: How effective is the previously experienced stress?


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Figure 1

Keywords related to stress memory in the agriculture field.
Keywords related to stress memory in the agriculture field.

Figure 2

Experimental scheme of the study.
Experimental scheme of the study.

Figure 3

Heat map clustering of (A) plant growth and biomass production traits, (B) mineral contents in leaf, (C) essential oil compounds in leaf and (D) phenolic acids in leaf corresponding to the stressed and non-stressed groups.
Heat map clustering of (A) plant growth and biomass production traits, (B) mineral contents in leaf, (C) essential oil compounds in leaf and (D) phenolic acids in leaf corresponding to the stressed and non-stressed groups.

Figure 4

PCA of (A) plant growth and biomass production traits, (B) mineral contents in leaf, (C) essential oil compounds in leaf and (D) phenolic acids in leaf corresponding to the stressed and non-stressed groups. PCA, principal component analysis.
PCA of (A) plant growth and biomass production traits, (B) mineral contents in leaf, (C) essential oil compounds in leaf and (D) phenolic acids in leaf corresponding to the stressed and non-stressed groups. PCA, principal component analysis.

Essential oil compounds corresponding to the stressed and non-stressed groups (%).

Treatments Delta-3-carene Camphene 2(10)-pinene 4(10)-thujene o-cymene D-limonene Eucalyptol Camphor Endoborneol
Sampling at Day 0 0.690 g 5.300 c 0.000 b 1.790 a 2.570 b 0.000 e 68.970 a 13.280 bc 6.580 ef
Stress after 11 days 1.490 e 4.200 e 0.690 a 0.000 f 1.780 e 0.000 e 68.473 a 17.320 a 6.020 f
Control after 11 days 1.690 d 4.670 d 0.000 b 0.920 d 2.190 c 3.020 b 66.010 a 14.990 b 8.020 cd
Stress group: recovery 1.670 d 5.360 c 0.730 a 0.000 f 0.000 g 0.000 e 69.170 a 14.180 bc 8.900 bc
Control group: recovery 0.050 h 4.160 e 0.000 b 0.990 d 2.783 a 1.450 c 69.200 a 14.220 bc 7.140 de
Stress group: stress 2.360 b 6.210 b 0.000 b 1.270 c 2.530 b 3.720 a 62.670 a 18.030 a 8.940 bc
Stress group: control 1.330 f 3.980 f 0.000 b 0.800 e 1.500 f 0.000 e 64.940 a 12.300 c 9.420 ab
Control group: stress 1.800 c 6.770 a 0.000 b 1.550 b 1.990 d 0.000 e 64.317 a 17.480 a 8.840 bc
Control group: control 2.950 a 3.160 g 0.000 b 0.910 d 0.000 g 0.150 d 65.983 a 12.540 bc 10.060 a
Significance p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.201 p = 0.000 p = 0.000

Experimental groups of the study, modified according to Kulak (2020) and Pintó-Marijuan et al. (2017).

Treatments Experimental groups
Sampling at Day 0 Sampling before treatments at Day 0
Stress after 11 days Sampling on Day 11 in stressed plant groups
Control after 11 days Sampling on Day 11 in irrigated plant groups
Stress group: recovery Samplings on Day 17 after the recovery stage of stressed plant groups
Control group: recovery Samplings on Day 17 after the recovery stages of irrigated plant groups
Stress group: stress Samplings on Day 28 in plants, which were subjected to a 11-day stress, a 6-day recovery and a 11-day stress
Stress group: control Samplings on Day 28 in plants, which were subjected to a 6-day stress, a 11-day recovery and a 7-day irrigation
Control group: stress Sampling on Day 28 in plants that were irrigated for 17 days and then stressed for 11 days
Control group: control Sampling on Day 28 in plants that were irrigated for 28 days

Mineral content changes corresponding to the stressed and non-stressed groups (mg · kg−1).

Treatments Ca K P Mg B Mo Fe Cu Zn Mn
Sampling at Day 0 253.53 e 144.78 c 196.26 ab 542.33 a 21.83 b 3.59 c 307.17 g 11.44 abc 7.90 e 61.34 f
Stress after 11 days 327.05 a 116.15 f 166.33 d 464.33 d 19.43 c 4.92 a 603.00 c 8.21 c 13.30 a 78.26 d
Control after 11 days 282.83 d 103.03 g 117.33 f 498.67 b 23.69 a 2.24 e 423.87 e 8.94 bc 3.39 g 60.21 fg
Stress group: recovery 312.06 b 142.65 cd 182.80 c 465.00 d 18.49 e 2.17 e 669.39 b 11.38 abc 10.56 b 85.96 b
Control group: recovery 290.60 cd 153.83 b 153.50 e 430.33 e 15.72 h 2.01 f 596.30 c 10.70 abc 5.42 f 80.54 c
Stress group: stress 229.85 f 124.78 e 200.97 a 393.00 f 18.53 e 1.50 g 594.60 c 12.86 a 13.54 a 78.62 d
Stress group: control 295.47 c 138.42 d 193.67 b 504.33 b 18.03 f 2.60 d 833.13 a 12.69 ab 8.99 c 90.38 a
Control group: stress 321.58 a 164.02 a 194.00 b 461.67 d 19.49 d 4.12 b 401.57 f 10.79 abc 8.44 d 73.38 e
Control group: control 249.99 e 142.30 cd 170.67 d 481.67 c 16.74 g 1.70 g 454.60 d 9.87 abc 5.30 f 59.45 g
Significance p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.121 p = 0.000 p = 0.000

Individual phenolic acids corresponding to the stressed and non-stressed groups (ng · μL−1).

Treatments Ascorbic acid Catechin Caffeic acid Ferulic acid o-Coumaric acid Rosmarinic acid Quercetin Kaempferol
Sampling at Day 0 0.000 f 2.150 g 1.567 g 3.805 b 1.293 c 6.460 f 0.650 d 1.099 g
Stress after 11 days 12.753 a 10.511 d 5.797 d 1.072 d 5.970 a 11.619 c 0.000 e 1.607 cde
Control after 11 days 0.000 f 2.864 g 1.884 fg 4.970 a 1.933 b 8.121 e 1.599 b 1.462 ef
Stress group: recovery 4.066 d 43.124 a 14.511 a 3.934 b 5.794 a 25.434 a 0.000 e 1.938 b
Control group: recovery 0.000 f 11.412 d 2.703 ef 1.741 c 1.935b 9.941 d 2.399 a 1.374 f
Stress group: stress 7.654 b 8.362 e 7.961 b 0.000 e 1.896 b 3.997 g 0.000 e 2.773 a
Stress group: control 2.737 e 4.849 f 7.172 c 1.253 d 1.367 c 6.330 f 1.236 bc 1.689 c
Control group: stress 5.982 c 17.827 c 2.954 e 1.789 c 1.941 b 10.796 cd 1.278 bc 1.654 cd
Control group: control 3.179 e 21.540 b 2.199 efg 2.001 c 1.379 c 13.427 b 1.025 c 1.500 def
Significance p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.000 p = 0.201

Plant growth and biomass production traits corresponding to the stressed and non-stressed groups.

Treatments Leaf (FW; g) Leaf (DW; g) Leaf rehydration (g) SWC (g) Leaf length (%) Leaf width (cm)
Sampling at Day 0 24.21 bcd 8.70 c 2.08 b 0.39 b 3.23 c 0.33 bc
Stress after 11 days 20.95 cd 13.88 abc 0.88 c 0.11 d 3.83 bc 0.23 de
Control after 11 days 35.25 b 14.06 abc 2.80 a 0.20 c 4.33 ab 0.33 bc
Stress group: recovery 20.17 cd 9.14 c 2.08 b 0.40 b 4.10 bc 0.27 cde
Control group: recovery 34.87 b 17.06 ab 2.13 b 0.52 a 5.13 a 0.40 b
Stress group: stress 13.79 d 12.07 bc 0.39 cd 0.048 e 3.80 bc 0.25 de
Stress group: control 27.05 bc 13.08 abc 2.85 a 0.37 b 3.77 bc 0.30 cd
Control group: stress 15.81 cd 12.03 bc 0.21 d 0.058 e 4.07 bc 0.20 e
Control group: control 50.36 a 18.42 a 2.38 ab 0.23 c 5.100 a 0.50 a
Significance p = 0.000 p = 0.026 p = 0.000 p = 0.000 p = 0.007 p = 0.000
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