AMELIORATIVE EFFECT OF STIGMASTEROL ON THE PRODUCTIVITY OF Vicia faba PLANTS GROWN UNDER SALT STRESS.

Abstract

The present investigation was carried out to study the effect of post-emergence soil treatment with different salinity levels (0.0, 100, 150 and 200 mM NaCl) on growth, endogenous phytohormones, yield components and some biochemical activities of the yielded seeds of Vicia faba plants. The results indicated that increasing of salinity up to 200 mM showed significant decreases in growth parameters at fruiting stage and yield components. On the other hand, the levels of IAA, GA3 decreased, while ABA level increased with salt stress. Biochemical activities of the yielded seeds such as carbohydrate contents and total protein significantly decreased as compared with non-salinized plant, while salt stress induced the accumulation of the total phenol and proline contents. In addition, the content of Na + increased significantly under salinity stress, while K + , Ca +2 and P +3 contents were decreased, when compared with those of the control. Application of stigmasterol by seed soaking, counteracted the adverse effects of salinity through inducing significant increases in all growth criteria at fruiting stage, yield components, levels of IAA, GA3, soluble, insoluble and total carbohydrates, total protein concomitantly with decreases in total phenols, proline content and level of ABA as compared with those of the reference plants. Also, treatment with stigmasterol resulted mostly in a decrease of Na+ accumulation concurrently with significant increases of K + , Ca +2 , P +3 contents, K + /Na + and Ca +2 /Na + ratio when compared with those of the reference controls. These results indicate the role of stigmasterol in increasing the tolerance of Vicia faba plants to salt stress. Three prominent types of modifications were observed in the protein patterns of yielded seeds, some proteins were disappeared, other proteins were selectively increased and synthesis of a new set of protein was induced, some of these responses were observed under stigmasterol and salinity, while others were induced by either stigmasterol or salinity.

Metabolic activities and molecular investigations of the ameliorative impact of some growth biostimulators on chilling-stressed coriander (Coriandrum sativum L.) plant

“…Moreover, HA and gamma radiation application on chilling-stressed coriander plant were shown to increase proline content. These results were similarly demonstrated on irradiated coriander [ 53 ], Pisum sativum L. [ 77 ], and wheat [ 14 ] plants.…”

“…Similar result concerning the effect of low dose of gamma radiation (20 Gy) on increasing the carbohydrate contents were reported on onion and potatoe [ 75 ] as well as Lupine [ 46 ]. HA was found to cause the accumulation of soluble sugars concomitantly with the increase in polysaccharides content and total carbohydrates in wheat plants grown in newly reclaimed soil [ 14 ]. Also, silicon has promoted photosynthetic pigments and hence total carbohydrates were increased.…”

NUTRIENT COMPOSITION, ANTIOXIDANT COMPONENTS AND ASCORBIC ACID CONTENT RESPONSE OF PEPPER FRUIT (Capsicum annuum L.) CULTIVARS GROWN UNDER SALT STRESS

“…Data presented in Table 2A and B, indicated that the increasing NaCl salinity concentration tended to decrease the inorganic mineral elements (K, S, P, Mg, Fe, Ca, Mn and Zn) contents and increased signicantly Na content compared with control plant. Also, Bassuony and al. (2008) found the content of K + ; Ca +2 and Mg +2 in Zea mays plant decreased significantly under salinity stress, compared with control.…”

Radio-Protective Effects of Stigmasterol on Wheat (Triticum aestivum L.) Plants

“…Similarly, the authors in [ 40 ] found that 150 or 200 ppm of stigmasterol resulted in the highest GA3 and IAA and the lowest ABA in both cultivars when compared to untreated plants. In addition, the authors in [ 41 , 42 ] stated that stigmasterol increases phytohormones, which can act as messengers and regulators of plant growth and development. The changes in the endogenous hormones were correlated with the changes in the activity of antioxidant enzymes, MDA, and proline, suggesting that the application of stigmasterol plays a central role in counteracting the injurious effects of gamma radiation.…”