Response to salinity in Glycine. VI. Some effects of a range of short-term salt stresses on the growth, nodulation, and nitrogen fixation of Glycine wightii (Formerly Javancia)

Abstract

Well-nodulated plants of Glycine wightii (formerly G. javanica) grown in sand culture were subjected to 14 days of salinity ranging from nil to 148 m-equiv. sodium chloride per litre of nutrient solution, and the response compared with that of similarly treated nitrogen-fertilized plants. The latter showed less tissue injury and a smaller reduction in growth rate at high salinity than the inoculated plants. During salinity treatment the development of new nodules, and nitrogen fixation by the existing nodules, were greatly inhibited, with a resulting marked decline in plant nitrogen concentration, especially in the laminae and nodules. Despite the severity of the salt effect on the inoculated plants, the nodules developed prior to salt treatment appeared remarkably resistant to stress, and rapidly regained pigmentation and efficiency of nitrogen fixation when the sodium chloride was removed from the culture solutions. Salt accumulation in the nodules was limited and the sensitivity of the symbiosis to salinity appeared primarily dependent on the host. These factors indicate the adaptability of the symbiosis to increases in substrate salinity.

Characterization of salt tolerance in tomato plant in terms of photosynthesis and water relations

“…The reduction in dry weight was less conspicuous in the cultivar Edkawi, followed by Momotaro and most significant in UC-97, indicating that Edkawi is more tolerant to salinity stress than the other cultivars, while UC-97 is more sensitive. These results are consistent with those obtained by other researchers (Wilson 1970;Hafeez et al 1988;Delgado et al 1994;Cordovillaet al 1996) who demonstrated that the salt treatment reduced plant growth markedly.…”

Effect of salinity on growth, photosynthesis and mineral composition in leguminous plantAlhagi pseudoalhagi(Bieb.)

“…Numerous researchers (Wilson 1970;Singleton and Bohlool 1984;Grattan and Maas 1988;Hafeez et al 1988;Wignarajah 1990;Delgado et al 1994;Cordovilla et al 1996) have reported that salt treatment reduced plant growth markedly even at low levels. However, we observed that the response of A. pseudoalhagi plants to salt was different in a sense that the whole plant dry weight increased approximately by 170% in the 50 mM treatment at 10 DAT (Fig.…”

Growth and symbiotic performance of faba bean inoculated withRhizobium leguminosarumbiovar.viciaestrains tolerant to salt

“…Plant growth and dry matter accumulation were reduced even by low salinity levels in Phaseolus vulgaris (Abdel-Ghaffar et al 1982), Glycine wightii (Wilson 1970), Glycine max (Grattan and Mass 1988), Vigna radiata (Hafeez et al 1988), and in K faba cv. Alameda, as shown in the present study.…”

“…These effects may be mediated through the effect of salt on the host, or through a specific effect on the microsymbiont itself. In many studies, it was reported that the upper limits for salinity tolerance of Rhizobium were higher than those of their host legumes (Wilson 1970;Bhardwaj 1975;Lauter et al 1981;Singleton et al 1982;Kassem et al 1985;Delgado et al 1993).…”