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Soil salinity modifies SO 2 sensitivity in soybean
Author(s) -
QIFU MA,
MURRAY FRANK
Publication year - 1991
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1991.tb01030.x
Subject(s) - salinity , soil salinity , horticulture , saline , dry weight , chlorophyll , sowing , agronomy , chemistry , biology , zoology , ecology , endocrinology
summary Soybean ( Glycine max L. cv. Buchanan) growing in top‐covered chambers was exposed to a factorial combination of three concentrations of SO 2 , (2, 99 and 189 nl1 −1 ) and three concentrations of soil salinity with electrical conductivities of 0.7, 4.9 and 7.0 dS m −1 . Each combination was tested in duplicate chambers. SO 2 exposure was for 4 h d −1 for 106 d from planting to final harvest. SO 2 , increased leaf sulphur concentrations, while high salinity had the opposite effect. Stress interactions were observed late in the season, with leaf sulphur concentrations significantly decreased by simultaneous SO 2 , and salinity stress when compared with exposure to SO 2 , alone, SO 2 or salinity stress both reduced leaf chlorophyll concentration, leaf area, plant dry weight and seed yields. Although SO 2 ‐salinity interactions on the growth variables were not statistically significant, there were stress interactions on seed yield by affecting the number of pods produced. As SO 2 ‐induced leaf injury developed is became more severe in the nonsaline plants than in the saline plants, indicating a protective function for salinity against SO 2 injury. However, salinity‐induced leaf injury occurred earlier and was more severe in the high SO 2 and saline‐treated plants than in the low SO 2 and non‐fumigated saline‐treated plants.