Growth, photosynthesis, nodule nitrogen and carbon fixation in the chickpea cultivars under salt stress

By N. Garg, R. Singla. 2004

85 citations recorded by the source corpus.

Four cultivars of chickpea, two of them of Mediterranean origin (kabuli), CSG 9651, BG 267 and two Indian (desi) types, CSG 8962, DCP 92-3, differing in their salt sensitivities were identified after screening ten genotypes in saline soils. The cultivars CSG 9651 and CSG 8962 were salt tolerant while BG 267 and DCP 92-3 were salt sensitive, respectively. The seeds of different cultivars were inoculated with Mesorhizobium ciceri, strain F: 75 and the plants were grown in the greenhouse. After the establishment of symbiosis, 15-day-old seedlings were administered doses of saline at varying concentrations (0, 4, 6, 8 dSm-1 NaCl, Na2SO4, CaCl2). Plants were harvested at 40, 70 and 100 days after sowing, for analyses. The main aim was to compare the relative salt tolerance of both desi and kabuli cultivars in terms of nitrogen fixation and carbon metabolism, as well as to ascertain whether the negative effects of saline stress on nitrogen fixation were due to a limitation of photosynthate supply to the nodule or to a limitation on the nodular metabolism that sustains nitrogenase activity. Plant growth, nodulation and nitrogenase activity was more severely affected in BG 267 and DCP 92-3 under salinity treatments (6 and 8 dSm-1) compared with CSG 9651 and CSG 8962. Nodule number as well as nodule mass increased under salt stress in CSG 9651 and CSG 8962 which might be responsible for their higher nitrogen fixation. Salinity reduced leaf chlorophyll and Rubisco activities in all cultivars. However, tolerant cultivars CSG 9651 and CSG 8962 showed smaller declines than the sensitive ones. Phosphoenolpyruvate carboxylase (PEPCase) activity increased significantly in the nodules of tolerant cultivars under salt stress at all harvests, and this was clearly related to salt concentrations. Our results suggest that in salt-affected soils tolerant cultivars have more efficient nodulation and support higher rates of symbiotic nitrogen fixation than the sensitive cultivars.

Subfields: Agronomy and Crop Science, Plant Science

View Paper: https://www.semanticscholar.org/paper/9b97fc69fb4016af70ca4b583701b1f9fecc6faf

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In Agronomy and Crop Science

1. G. Manchanda
2. N. Garg

In Plant Science

1. G. Manchanda
2. P. Panneerselvam
3. N. Tejera
4. C. Lluch
5. N. Garg
6. M. Fujita
7. M. Hasanuzzaman

Citations in the corpus

• Effect of Arbuscular Mycorrhizal Inoculation on Salt-induced Nodule Senescence in Cajanus cajan (Pigeonpea) (2008, background): “An increase in the average nodule weight with increasing salinity level has already been reported for chickpea (Soussi and others 1998; Garg and Singla 2004 ) and for faba bean (Cordovilla and others 1999).”
• Physiological and nutritional indicators of tolerance to salinity in chickpea plants growing under symbiotic conditions (2006, background): “The odulation capacity of chickpea under stress has been used s an indicator to select chickpea genotypes grown in Indian oils (Rao et al., 2002; Garg and Singla, 2004).”
• Arbuscular mycorrhizal symbiosis: plant growth improvement and induction of resistance under stressful conditions (2021, background): “In addition, several previous studies suggested that CO2 fixation is susceptible to environmental stress in the Calvin cycle, including temperature change (Song et al. 2014), and salt stress (Garg and Singla 2004).”