. 2021 Apr 25;9(5):920. doi: 10.3390/microorganisms9050920

Table 1.

Greenhouse drought and salt stress tolerance in mature weedy rice lines and commercial cultivars.

	Biomass (g)		Seed Yields (g)
	Biomass (g)		Seed Yields (g)
A. Drought Stress Weedy Rice Lines (N = 7)	S-Cb	UT	S-Cb	UT
A. Drought Stress Weedy Rice Lines (N = 7)	(SD ± 2.8–30.0)	(SD ± 4.5–20.1)	(SD ± 0.7–2.8)	(SD ± 1.0–3.7)
2559	456.7 ^a	404.3 ^b	24.6 ^a	21.9 ^a
2581	573.5 ^a	510.0 ^b	25.1 ^a	11.7 ^b
2604	56.2 ^a	40.25 ^b	ND	ND
2691	105.5 ^a	34.7 ^b	8.2 ^a	0 ^b
2716	580.2 ^a	424.5 ^b	35.5 ^a	24.3 ^b
2733	403.7 ^a	330.3 ^b	27.3 ^a	20.4 ^b
2861	389.5 ^a	370.3 ^a	22.7 ^a	16.5 ^b
Commercial Rice Cultivars (N = 2)
Dongjin	192.7^a	143.2^a	11.6^a	6.2 ^b
M206	213.4^a	181.9^a	20.1^a	12.8 ^b
	Biomass (g)		Seed Yields (g)
	Biomass (g)		Seed Yields (g)
B. Salt Stress Weedy Rice Lines (N = 8)	S-Fa	UT	S-Fa	UT
B. Salt Stress Weedy Rice Lines (N = 8)	(SD ± 7.0–26.4)	(SD ± 3.7–28.1)	(SD ± 1.0–2.6)	(SD ± 0.8–2.6)
2518	132.2 ^a	97.5 ^b	ND	ND
2582	420.0 ^a	360.8 ^b	33.6 ^a	30.2 ^a
2687	530.2 ^a	365.3 ^b	49.5 ^a	40.4 ^b
2692	489.5 ^a	393.5 ^b	36.0 ^a	29.5 ^b
2693	483.5 ^a	449.5 ^a	38.7 ^a	36.7 ^a
2844	477.0 ^a	405.5 ^b	35.4 ^a	20.8 ^b
22024	481.0 ^a	425.2 ^b	46.4 ^a	41.4 ^b
22099	492.7 ^a	446. 3^b	31.2 ^a	24.8 ^b
Commercial Rice Cultivars (N = 2)
Dongjin	120.4 ^a	88.7 ^b	9.6 ^a	5.9 ^b
M206	154.8 ^a	137.3 ^a	14.7 ^a	8.3 ^b

Drought and salt stress on mature rice plants (<4 months) under greenhouse conditions. Untreated (UT) and symbiotic (S) plants were generated with native endophytes isolated from weedy rice lines from drought (SCb) or salt stress (SFa) habitats. Six plants were grown in pots and ×4 pots/treatment (N = 24 total) for each rice line and cultivar tested. Seven drought tolerant weedy rice and two commercial rice varieties were grown for three months and drought stress imposed by termination of watering for 14 days. For salt stress, eight salt tolerant weedy rice lines and two commercial rice varieties were exposed to increasing salt solutions of 50, 100, 150 and 200 mM NaCl every three weeks. Plant biomass and seed yields were assessed upon termination of the studies. The seed yields of weedy rice drought tolerant 2604 and salt tolerant 2518 lines were not determined due to insect and/or microbial pathogen impacts. Statistical analysis was performed using Duncan’s Multiple Range test. Different letters and color shading indicate significant differences (p < 0.01). ND = Not Determined.