Table 1.
Effects of pre-treatment and post-treatment of allantoin (AT) on growth and photosynthetic pigments in tomato plants grown 15 days in the presence or absence of UVC stress.
| Treatments | RGR | SFW (g) |
RFW (g) |
SDW (g) |
RDW (g) |
Chl-a Content | Chl-b Content | Chl-a+b Content | Car Content |
|---|---|---|---|---|---|---|---|---|---|
| C | 0.050 ± 0.002 d | 8.64 ± 0.32 f | 3.08 ± 0.11 d | 0.933 ± 0.03 g | 0.206 ± 0.007 e | 2.43 ± 0.09 f | 0.670 ± 0.02 d | 3.11 ± 0.11 f | 1.30 ± 0.04 e |
| UVC1 | 0.025 ±0.003 a,b | 4.59 ± 0.17 a | 2.10 ± 0.07 a | 0.490 ± 0.01 a,b | 0.155 ± 0.005 a | 1.37 ± 0.05 a,b | 0.559 ± 0.02 a | 1.93 ± 0.07 a,b | 0.745 ± 0.02 a |
| UVC2 | 0.017 ± 0.000 a | 3.49 ± 0.12 b | 1.03 ± 0.03 b | 0.361 ± 0.01 c | 0.075 ± 0.002 b | 0.893 ± 0.03 c | 0.344 ± 0.01 b | 1.23 ± 0.04 c | 0.494 ± 0.01 b |
| Pre-AT | 0.076 ± 0.004 c | 11.77 ± 0.11 c | 4.56 ± 0.04 c | 1.927 ± 0.01 d | 0.230 ± 0.002 c | 3.18 ± 0.03 d | 0.874 ± 0.008 c | 4.06 ± 0.04 d | 1.55 ± 0.01 c |
| AT+ UVC1 | 0.044 ± 0.003 d | 7.40 ± 0.04 d | 2.83 ±0.01 d | 0.726 ± 0.00 e | 0.224 ± 0.001 c | 2.38 ± 0.01 e,f | 0.662 ± 0.004 d | 3.04 ± 0.01 e,f | 2.34 ± 0.01 d |
| AT+ UVC2 | 0.029 ± 0.001 b | 6.40 ± 0.33 e | 1.84 ± 0.09 a | 0.608 ± 0.03 a,e | 0.113 ± 0.005 d | 2.06 ± 0.10 e | 0.713 ± 0.03 d | 2.77 ± 0.14 e | 1.37 ± 0.07 e |
| Post-AT | 0.078 ± 0.003 c | 11.11 ± 0.57 c | 3.95 ± 0.20 e | 2.088 ± 0.10 f | 0.221 ± 0.011 c,e | 3.35 ± 0.17 d | 0.878 ± 0.04 c | 4.23 ± 0.21 d | 1.25 ± 0.06 e |
| UVC1+AT | 0.031 ± 0.002 b | 5.63 ± 0.21 e | 2.43 ± 0.09 f | 0.589 ± 0.02 a,b | 0.168 ± 0.006 a | 1.66 ± 0.06 a | 0.548 ± 0.003 a | 2.20 ± 0.06 a | 1.31 ± 0.05 e |
| UVC1+AT | 0.021 ± 0.002 a | 4.31 ± 0.15 a | 1.48 ± 0.05 g | 0.471 ± 0.01 b,c | 0.093 ± 0.003 f | 1.28 ± 0.04 b | 0.443 ± 0.004 e | 1.72 ± 0.04 b | 0.539 ± 0.01 b |
Values are means ± standard deviation (SDs) (n = 5). Means followed by the same letter are non-significant among the treatments within the same column at p ≤ 0.05 considering Tukey’s test. RGR, relative growth rate, SFW, shoot fresh weight; RFW, root fresh weight; SDW, shoot dry weight; RDW, root dry weight; chlorophyll (Chl)-a (mg g−1 FW); Chl-b (mg g−1 FW); Chl-a+b (mg g−1 FW), and carotenoids (Car, mg g−1 FW). “C”, no AT and grown under non-stress condition; “UVC1”, exposed to 0.6 W m−2 UVC irradiation; “UVC2”, exposed to 1.2 W m−2 UVC irradiation; “Pre-AT”, pretreated with 100 nM AT and after that exposed to 0 W m−2 UVC irradiation; “AT+UVC1”, pretreated with 100 nM AT and after that exposed to 0.6 W m−2 UVC irradiation; “AT+UVC2”, pretreated with 100 nM AT and after that exposed to 1.2 W m−2 UVC irradiation; “Post-AT”, exposed to 0 W m−2 UVC irradiation and after that post-treated with 100 nM AT; “UVC1+AT”, exposed to 0.6 W m−2 UVC irradiation and after that post-treated with 100 nM AT; “UVC2+AT”, exposed to 1.2 W m−2 UVC irradiation and after that post-treated with 100 nM AT.