Nodule Structure and Functioning in Chickpea (Cicer Arietinum) as Affected by Salt Stress

Babber, S.; Sheokand, Sunita; Malik, S.

doi:10.1023/a:1002764512963

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…1995). These substantial reductions at 100 m m NaCl, a level of salinity that can kill many chickpea cultivars (see the section on vegetative growth) were also observed by Kumar & Promila (1983) and in other studies have been interpreted as nodule ‘senescence’ (Babber et al . 2000).…”

Section: N2‐fixationsupporting

confidence: 75%

“…The capacity for N 2 ‐fixation by chickpea in saline soils can decline owing to the inhibitory effect of salinity leading to fewer nodules, which can typically be smaller (discussed above, see also Babber, Sheokand & Malik 2000) than those produced in the absence of salt. In addition, N 2 ‐fixation capacity per unit nodule mass may be reduced under saline conditions.…”

Section: N2‐fixationmentioning

confidence: 99%

“…Nodule O 2 conductance can be regulated by physiological modulation of the O 2 ‐diffusion barrier in nodules and/or by structural changes. Structural changes in salt‐affected nodules of chickpea might reduce nodule conductance to O 2 and restrict N 2 ‐fixation capacity (Babber et al . 2000).…”

Section: N2‐fixationmentioning

confidence: 99%

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The growth of chickpea (Cicer arietinum L.) is very sensitive to salinity, with the most susceptible genotypes dying in just 25 mM NaCl and resistant genotypes unlikely to survive 100 mM NaCl in hydroponics; germination is more tolerant with some genotypes tolerating 320 mM NaCl. When growing in a saline medium, Cl -, which is secreted from glandular hairs on leaves, stems and pods, is present in higher concentrations in shoots than Na + . Salinity reduces the amount of water extractable from soil by a chickpea crop and induces osmotic adjustment, which is greater in nodules than in leaves or roots. Chickpea rhizobia show a higher 'free-living' salt resistance than chickpea plants, and salinity can cause large reductions in nodulation, nodule size and N2-fixation capacity. Recent screenings of diverse germplasm suggest significant variation of seed yield under saline conditions. Both dominance and additive gene effects have been identified in the effects of salinity on chickpea and there appears to be sufficient genetic variation to enable improvement in yield under saline conditions via breeding. Selections are required across the entire life cycle with a range of rhizobial strains under salt-affected, preferably field, conditions.

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Section: N2‐fixationsupporting

confidence: 75%

Section: N2‐fixationmentioning

confidence: 99%