Drought Effects on Carbon Exchange and Nitrogen Fixation in Pigeonpea (Cajanus cajan L.)

Nandwal, A. S.; Bharti, S.; Sheoran, I. S.; Kuhad, M. S.

doi:10.1016/s0176-1617(11)80744-3

Cited by 15 publications

(10 citation statements)

References 14 publications

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“…In pigeon pea nodules, a decline in leghemoglobin was associated with a decline in nitrogenase enzyme activity and lower N 2 -fixing levels (Nandwal et al, 1991). Legumes exposed to Fe-deficiency develop many nodule initials but few functioning nodules (Tang 1990).…”

Section: Nutrition Parameter Phosphate Treatmentmentioning

confidence: 99%

Nodules from Fynbos legume Virgilia divaricata have high functional plasticity under variable P supply levels

Vardien

Mesjasz‐Przybyłowicz

Przybyłowicz

et al. 2014

Journal of Plant Physiology

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Legumes have the unique ability to fix atmospheric nitrogen (N 2 ) via symbiotic bacteria in their nodules but depend heavily on phosphorus (P), which affects nodulation, and the carbon costs and energy costs of N 2 fixation. Consequently, legumes growing in nutrient-poor ecosystems (e.g. sandstone derived soils) have to enhance P recycling and/ or acquisition in order to maintain N 2 fixation. In this study, we investigated the flexibility of P recycling and distribution within the nodules and their effect on N nutrition in Virgilia divaricata Adamson, Fabaceae, an indigenous legume in the Cape Floristic Region of South Africa. Specifically, we assessed tissue elemental localization using micro-particle induced x-ray emission 1 (PIXE), measured N fixation using nutrient concentrations derived from inductively coupled mass spectrometry (ICP-MS), calculated nutrient costs, and determined P recycling from enzyme activity assays. Morphological and physiological features characteristic of adaptation to P-deprivation were observed for V. divaricata. Decreased plant growth and nodule production with parallel increased root: shoot ratios are some of the plastic features exhibited in response to P deficiency. Plants resupplied with P resembled those supplied with optimal P levels in terms of growth and nutrient acquisition. Under low P conditions, plants maintained an increase in N 2 -fixing efficiency despite lower levels of orthophosphate (Pi) in the nodules.This can be attributed to two factors: i) an increase in Fe concentration under low P, and ii) greater APase activity in both the roots and nodules under low P. These findings suggest that V. divaricata is well-adapted to acquire N under P deficiency, owing to the plasticity of its nodule physiology.

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Section: Nutrition Parameter Phosphate Treatmentmentioning

confidence: 99%

Nodules from Fynbos legume Virgilia divaricata have high functional plasticity under variable P supply levels

Vardien

Mesjasz‐Przybyłowicz

Przybyłowicz

et al. 2014

Journal of Plant Physiology

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“…Pigeonpea is a tropical grain-legume with high tolerance of dehydration (Ford, 1984;Singal et al, 1985;Flower and Ludlow, 1986;Lopez et al, 1987;Nandwal et al, 1991). The lethal leaf water potential (y L ) and relative water content (RWC) are -6-3 MPa and 32%, respectively (Flower and Ludlow, 1986).…”

Section: Introductionmentioning

confidence: 99%

Carbohydrate Metabolism in Drought-Stressed Leaves of Pigeonpea (Cajanus cajan)

1993

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Pigeonpea is a tropical grain-legume, which is highly dehydration tolerant. The effect of drought stress on the carbohydrate metabolism in mature pigeonpea leaves was investigated by withholding water from plants grown in very large pots (50 kg of soil). The most striking feature of drought-stressed plants was the pronounced accumulation of D-pinitol (lD-3-methyl-c/i/ro inositol), which increased from 14 to 85 mg g" 1 dry weight during a 27 d stress period. Concomitantly, the levels of starch, sucrose and the pinitol precursors myo-inositol and ononitol all decreased rapidly to zero or near-zero in response to drought. The levels of glucose and fructose increased moderately. Drought stress induced a pronounced increase of the activities of enzymes hydrolysing soluble starch (amylases) and sucrose (invertase and sucrose synthase). The two anabolic enzymes sucrose phosphate synthase (sucrose synthetic pathway) and myo-inositol methyl transferase (pinitol synthetic pathway) also showed an increase of activity during stress. These results indicate that pinitol accumulated in pigeonpea leaves, because the carbon flux was diverted from starch and sucrose into polyols.

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“…Water stress led to a decline in respiration of leaves as compared to control and drastic reduction observed at soil water potential of -1.34 MPa in Cajanus cajan (Nandwal et al 1991). Water stress affects the rate of dark respiration, but considerable respiration occurs when no net photosynthesis occur the reason for this is starting of senescence in leaves.…”

Section: Photosynthesis/respirationmentioning

confidence: 92%

Managing Water Stress by Potassium Fertilizer in Legumes for Sustainable Agricultural Intensification: A Review

Kataria

Singh

2021

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Water stress has become the most uncontrolled and unpredictable factor, which is continuously limiting production in crops. Legumes are the major source of protein and are well-recognized for their nutritional benefits as well as their impact on the sustainability of agricultural systems are well known. Leguminous crops are severely affected by water stress causing alterations in various development processes. Proper nutrient management helps in attaining economical legume yields from drought-prone lands. The protective role of potassium in plants suffering from water stress has been documented and it positively influences plant capacity to adjust water stress conditions. This review compromises the information on the water stress-induced harmful effects on legumes growth, nitrogen fixation, gaseous exchange and mineral uptake parameters and proposes appropriate management by potassium application to alleviate the severity of water stres on above mentioned parameters. Application of potassium proved to meet higher yield from legume on cultivation under low/residual soil moisture availability conditions.

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Drought Effects on Carbon Exchange and Nitrogen Fixation in Pigeonpea (Cajanus cajan L.)

Cited by 15 publications

References 14 publications

Nodules from Fynbos legume Virgilia divaricata have high functional plasticity under variable P supply levels

Nodules from Fynbos legume Virgilia divaricata have high functional plasticity under variable P supply levels

Carbohydrate Metabolism in Drought-Stressed Leaves of Pigeonpea (Cajanus cajan)

Managing Water Stress by Potassium Fertilizer in Legumes for Sustainable Agricultural Intensification: A Review

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