Claim · model-written summary
The decrease in shoot N is attributed to a sharp reduction in nodule number and dry weight.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- nodulee1
- Outcome
- shoot Ne1
- Qualifier
- sharp reduction in nodule number and dry weighte1
Verbatim
e0“A split-root growth system was employed to evaluate the effect of NaCl on nodule formation by soybean (Glycine max L. Merr. cv Davis).”
e1“The decrease in shoot N was attributed to a sharp reduction in nodule number and dry weight.”
Title
Effect of Salinity on Nodule Formation by Soybean
Paul W. Singleton; B. Ben Bohlool PLANT PHYSIOLOGY 1984. doi:10.1104/pp.74.1.72
Other claims from this paper (15)
- Intervention effect Rhizobium colonization of inoculated root surfaces was not affected by the salt treatments.
- Intervention effect Shoot dry weight of soybean was unaffected by the NaCl treatments.
- Intervention effect Total shoot N declined from 1.26 to 0.44 grams N per pot as NaCl rose from 0.0 to 79.9 millimolar.
- Intervention effect Shoot N concentration decreased from 3.75% to 1.26% N at 79.9 millimolar NaCl relative to 0.0 millimolar NaCl.
- Intervention effect Nodule number and weight were reduced by approximately 50% at 26.6 millimolar NaCl.
- Intervention effect Nodule number and weight were reduced by more than 90% at 53.2 and 79.9 millimolar NaCl.
- Association Average nodule weight was not as greatly affected by salt as nodule number.
- Association Total nitrogenase activity decreased in proportion to nodule number and dry weight under NaCl.
- Association Specific nitrogenase activity was less affected by salinity than total nitrogenase activity.
- Association Specific nitrogenase activity was not depressed significantly until 79.9 millimolar NaCl.
- Intervention effect Rhizobium japonicum isolates from nodules formed at 79.9 millimolar NaCl did not increase nodulation under salt stress compared with isolates from normal media.
- Association Delaying salt application for 12 hours increased nodule number, nodule weight and shoot N.
- Intervention effect Nodule formation in the 12- and 96-hour salt treatments was lower than in the control.
- Association Early steps of nodule initiation are extremely sensitive to even low concentrations of NaCl.
- Mechanism The sensitivity of nodule initiation is not related to rhizobial survival and is probably due to salt sensitivity of root infection sites.