Effect of applied nitrate on enzymes of ammonia assimilation in nodules ofCicer arietinum L.

Sawhney, Veena; Amarjit,; Singh, Randhir

doi:10.1007/bf02182899

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…This activity (Table 2c) was much smaller than that in other legumes, even in the presence of 8raM NO 3 (Groat et al, 1984;Sawhney et al, 1985), thus minimizing its biological significance in field-bean nodules. This activity (Table 2c) was much smaller than that in other legumes, even in the presence of 8raM NO 3 (Groat et al, 1984;Sawhney et al, 1985), thus minimizing its biological significance in field-bean nodules.…”

Section: Discussionmentioning

confidence: 86%

Genotypic differences in nitrogen assimilation in Vicia faba: Effect of nitrate

1993

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Five inbred lines and a commercial cultivar of field-bean (Vicia faba) were inoculated with a strain of Rhizobium leguminosarum bv. viciae and grown, with or without nitrate, under axenic conditions in a growth chamber. There were significant (p < 0.01) differences between lines in N yield, both in N-free solution (N 2 fixed, fully symbiotic) and with added NO 3. Increase in the N yield of NO3-fed plants compared with fully symbiotic plants also varied between genotypes, with line VF109 being the least responsive to NO 3. This may indicate nitrate tolerance in relation to N 2 fixation. The indication was supported by the observations that nodule development and nodule activity (acetylene reduction) were less inhibited in VF109 in the presence of 8 mM NO 3 than in the other lines of Vicia faba. Glutamine synthetase and glutamate synthase (GOGAT) activities appeared to be related to genotypic differences in symbiotic efficiency. This finding suggests that assays of nodule glutamine synthetase and NADHglutamate synthase might be used in Vicia faba breeding programs to indicate capacity for symbiotic N 2 fixation, particularly in the presence of NO3.

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Section: Discussionmentioning

confidence: 86%