Table 3 The effects of bacterial inoculation, salinity levels and melatonin on nitrogen concentration and content, and content of protein in shoots and roots of common bean.

From: Co-application of ACC deaminase-producing rhizobial bacteria and melatonin improves salt tolerance in common bean (Phaseolus vulgaris L.) through ion homeostasis

Factor	Nitrogen concentration (%)		Nitrogen content (g pot⁻¹)		Protein content (%)
Factor	Shoot	Root	Shoot	Root	Shoot	Root
Bacterial inoculations (I)
NI	1.42^b	1.40^b	14.14^b	3.99^b	8.87^b	8.76^b
RI	2.13^a	1.69^a	25.25^a	5.58^a	13.33^a	10.60^a
Salinity levels (S)
NS	2.08^a	1.73^a	26.63^a	6.12^a	13.02^a	10.87^a
S1	1.70^b	1.57^b	18.64^b	4.79^b	10.64^b	9.85^b
S2	1.54^c	1.33^c	13.83^c	3.44^c	9.63^c	8.32^c
Priming (P)
PM100	2.10^a	1.68^a	27.10^a	6.02^a	13.17^a	10.52^a
PH	1.56^b	1.62^a	17.55^b	5.03^b	9.75^b	10.13^a
PD	1.66^b	1.34^b	14.45^c	3.30^c	10.38^b	8.39^b
Bacterial inoculations × Salinity levels × Priming (I × S × P)
NI
NS
PM100	1.43^g–j	1.75^c	21.22^de	7.04^c	8.98^g–j	10.94^c
PH	1.82^d–g	1.56^de	19.60^d–g	4.72^e	11.39^d–g	9.77^de
PD	1.62^f–i	1.38^e–g	14.30^h–j	3.48^g–j	10.18^f–i	8.66^e–g
S1
PM100	1.21^jk	1.26^gh	12.60^i–l	3.69^f–i	7.56^jk	7.90^gh
PH	1.52^g–j	1.54^e	15.85^f–i	4.50^ef	9.54^g–j	9.64^e
PD	1.34^ij	1.49^ef	9.60^kl	3.18^h–j	8.38^ij	9.35^ef
S2
PM100	1.72^e–i	1.12^h	15.17^g–j	2.84^ij	10.80^e–i	7.03^h
PH	0.86^k	1.34^fg	8.20^l	3.73^f–h	5.37^k	8.40^fg
PD	1.22^jk	1.14^h	10.74^j–l	2.69^j	7.63^jk	7.13^h
RI
NS
PM100	3.42^a	2.37^a	54.80^a	10.26^a	21.42^a	14.84^a
PH	2.14^b–d	2.00^b	27.79^c	7.17^bc	13.39^b–d	12.55^b
PD	2.04^c–e	1.35^fg	22.05^de	4.07^e–g	12.77^c–e	8.43^fg
S1
PM100	2.52^b	2.07^b	35.25^b	7.94^b	15.75^b	12.98^b
PH	1.64^f–i	1.72^cd	20.37^d–f	5.90^d	10.28^f–i	10.80^cd
PD	1.97^c–f	1.34^fg	18.17^e–h	3.52^g–j	12.34^c–f	8.42^fg
S2
PM100	2.31^bc	1.50^ef	23.58^cd	4.34^e–g	14.49^bc	9.43^ef
PH	1.36^h–j	1.53^e	13.47^i–k	4.16^e–g	8.55^h–j	9.60^e
PD	–	–	–	–	–	–
Analysis of variance
I	***	***	***	***	***	***
S	***	***	***	***	***	***
P	***	***	***	***	***	***
I × S	ns	ns	***	***	ns	ns
I × P	***	***	***	***	***	***
S × P	***	***	***	***	***	***
I × S × P	***	***	***	*	***	***

I, S and P are bacterial inoculations, salinity levels and priming treatments. NI and RI are non-inoculation and Rhizobium inoculated plants. NS, S1 and S2 are non-saline, 4 and 8 dSm⁻¹ of salinity stress, respectively. PM100, PH and PD are melatonin priming, hydro priming and non-priming, respectively. ns, *, ** and *** indicate non-significant and significance at 5%, 1% and 0.1%, respectively. Different letters within a column indicate means that are significantly different at P < 0.05.

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Table 3 The effects of bacterial inoculation, salinity levels and melatonin on nitrogen concentration and content, and content of protein in shoots and roots of common bean.

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