Alfalfa and Its Symbiosis Responses to Osmotic Stress

Abstract

Alfalfa (Medicago sativa L.) is one of the most cultivated forage legumes in Morocco thanks to its great adaptation to the climatic conditions of this country, its high protein content and its ability to ix atmospheric nitrogen in symbiosis with rhizobia. Environmental stresses such as drought and salinity constitute a major factor limiting the symbiotic nitrogen ixation and legume productivity. In the last decades, this process has interested scholars in understanding the implication of these strains in legume stress tolerance in order to make these symbioses more eicient under diicult conditions. Seed osmopriming is a great technique in the amelioration of seed germination and seedlings growth in responses to several abiotic stress conditions. In this chapter, the efects of water deicit on the Moroccan alfalfa populations and their symbiotic association with rhizobia were discussed. Besides, osmopriming could make these symbioses more eicient especially under stress conditions.

Inoculation with rhizobacterial consortia alleviates combined water and phosphorus deficit stress in intercropped faba bean and wheat

“…Our results did not show any enhancement of nodular enzyme activities involved in P availability, e.g., acid phosphatase or phytase, in intercropped faba bean. However, previous studies reported that intercropping reduced APase activity in the faba bean rhizosphere, while it increased in the associated barley rhizosphere (Mouradi et al, 2018). This variation in enzyme activity could prove one of the facilitation actions through the release of enzymes by legume nodules into the rhizospheric soil of associated crops, in which we did not assess this activity.…”

“…The effects of the most prevailing abiotic stresses on legume crops in Morocco, such as drought and P limitation (Bargaz et al, 2012;Mouradi et al, 2015Mouradi et al, , 2018Kabbadj et al, 2017), and on intercropping legume/cereal systems (Bargaz et al, 2017;Mouradi et al, 2018) were studied separately. However, only a few studies have considered inoculation with PGPR consortia including rhizobia to enhance legume/cereal growth and production under stressful conditions.…”

Water Stress Response in Different <i>Jatropha curcas</i> Accessions from Different Geographical Zones of Botswana: Biochemical & Physiological Perceptive

“…It should be noted that Thamaga accession which displayed the highest MDA content, also exhibited a higher electrolyte leakage (Figure 2). The highest electrolyte leakage percentage could be ascribed to physiological structure of biological membranes and their chemical composition being modified by dehydration, which increased cell membrane permeability [21].…”

SPL12 Regulates AGL6 and AGL21 to Modulate Nodulation and Root Regeneration under Osmotic Stress and Nitrate Sufficiency Conditions in Medicago sativa

“…The symbiotic interaction between legume plants and rhizobacteria can be negatively impacted by drought, resulting in reduced nodule numbers and diminished nitrogenase activity [61][62][63]. Nitrogenase activity in root nodules of M. truncatula was decreased by 18% and 66% after two and four days of water withdrawal, respectively [64].…”