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Dry Matter Yield and Nitrogen‐15 Uptake by Tomatoes Under Sodium Chloride Stress
Author(s) -
Pessarakli M.,
Tucker T. C.
Publication year - 1988
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1988.03615995005200030019x
Subject(s) - shoot , dry matter , salinity , nitrogen , lycopersicon , chemistry , sodium , nutrient , horticulture , osmotic pressure , hoagland solution , agronomy , biology , ecology , organic chemistry , biochemistry
An absorption study was conducted in nutrient solution with seedlings of tomato ( Lycopersicon esculentum Mill.; cv. Columbia) to observe the effects of NaCl on ( 15 N) uptake and distribution in plant roots and shoots. The 14‐d‐old seedlings were grown for 16 d (14 d as group of 6 plants per container and 2 d after the final transfer of 2 plants per container) in complete Hoagland solution no. 1, then salinized (except the controls, −0.03 MPa) to −0.3, −0.6, and −0.9 MPa osmotic potentials with NaCl. Nutrient solutions were sampled daily for N loss after addition of 15 NH 4 15 NO 3 to the pots. The cumulative 15 N loss was considered to be absorbed by plants. Lowering the osmotic potential of the culture solution decreased total N uptake at all salinity levels, and 15 N uptake of the plants at medium (−0.6) and high (−0.9 MPa) salinity levels. A low level of salinity (−0.3 MPa) did not affect 15 N uptake compared with the control (−0.03 MPa). Water uptake and dry matter yield were affected to a greater extent than 15 N absorption. Nitrogen‐15 concentration was slightly higher in roots than in shoots.