Mechanisms of drought resistance in grain legumes I: Osmotic adjustment
By T. Amede, S. Schubert, K. Stahr. 2004
91 citations recorded by the source corpus.
When crops are exposed to drought there is commonly an increase in solute-pool of the plant tissue. A series of experiments were conducted in 1994 and 1995 in the University of Hohenheim, Germany, to evaluate whether drought-induced solute accumulation per se will improve drought resistance, to determine the species of active osmotica involved, and to identify alternative mechanisms in grain legumes, namely Common bean ( Phaseolus vulgaris ) faba bean ( Vicia faba ), pea ( Pisum sativum ), and chickpea ( Cicer arietinum ). Drought, equivalent to soil water potential of -0.64 MPa, decreased the leaf water potential to -1.67, -1.83, -0.34 and -1.32 MPa and resulted in dry matter yield reduction of 36.4%, 23.9%, 17.6% and 14.5% in faba bean, pea, common bean, and chickpea, respectively. Higher yield of chickpea and common bean under drought was augumented by turgor maintenance. The highest degree of turgor (1.0 MPa) was in common bean, though it had the lowest solute accumulation. Thus, a decrease in osmotic potential was not the only strategy of turgor maintenance in legumes. Increase in solute pool in all was due to concentration effect as a result of water loss and growth inhibition, except in chickpea. The major osmotica in chickpea were of organic origin, namely sugars and sugar alcohols contributing more than 50%, and amino compounds 20% of the osmotic pool. Calcium was the only inorganic osmoticum contributing 19% of the pool. Concentration of solutes in the cell-sap did not necessarily indicate the level of contribution to the osmotic pool, as the most abundant ions (e.g., potassium) did not contribute to osmotic adjustment under drought. It was concluded that it is vital to differentiate solutes accumulated as a concentration effect from active osmotica using cell water volume of control plants before considering solute concentration as a selection criterion for breeding drought resistant varieties/crops. Key words/phrases: Active osmotica, concentration effect, drought, grain legumes SINET: Ethiop. J. Sci Vol.26(1) 2003: 37-46
Subfields: Agronomy and Crop Science, Plant Science
View Paper: https://www.semanticscholar.org/paper/3bf6d04ee6fb8ec79668d1f5f6b6d4819af442d8
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Agronomy and Crop Science
In Plant Science
Citations in the corpus
- Evaluation of physiological traits for improving drought tolerance in faba bean (Vicia faba L.) (2007, background): “Faba bean is more sensitive to drought than some other grain legumes including common bean, pea and chickpea (McDonald and Paulsen 1997; Amede and Schubert 2003).”
- Improving Drought-Avoidance Root Traits in Chickpea (Cicer arietinum L.) -Current Status of Research at ICRISAT (2008, background): “Some major root attributes such as greater effi ciency in water absorption per unit root length density, ability to change the rooting pattern across soil depths to effi ciently access the available soil moisture and the ability to produce a larger root surface area per unit root biomass seem to mak”