Table 2.

Effect of flooding on growth, nodulation and nitrogenase (acetylene reduction activity, ARA) of Sesbania cannabina and S. bispinosa (syn. S. aculeata) at 30 days after inoculation with Rhizobium (Agrobacterium) sp. strain IRBG74.

	Plant dry weight (mg)	Nodule No.	Nodule dry weight (mg)	ARA (nmol C2H4 per plant h−1)
S. cannabina
Non‐flooded	81.4 ± 7.5	9 ± 2	4.6 ± 0.4	247.8 ± 51.2
Flooded	187.6 ± 9.2	24 ± 3	26.3 ± 1.7	755.6 ± 89.9
S. bispinosa
Non‐flooded	16.0 ± 2.3	4 ± 1	0.7 ± 0.1	41.2 ± 11.0
Flooded	18.8 ± 3.3	12 ± 1	2.9 ± 0.3	84.4 ± 11.2

n = 6. Values are means ± SE.