Investigation of the proline role in controlling traits related to sugar and root yield of sugar beet under water deficit conditions

Evaluation of Silicon and Proline Application on the Oxidative Machinery in Drought-Stressed Sugar Beet

“…It is well-known that proline accumulation, over-expression of MDA content and CAT and SOD activities in sugar beet under drought displays a defense mechanism against the negative impacts of drought, the abovementioned characters considerably increased in stressed sugar beet plants in comparison to control. The over-accumulation in MDA and proline is a response to drought, our findings are in agreement with the results of some researchers, they reported that proline and MDA considerably elevated under stress circumstances in many plants [ 9 , 10 , 28 , 42 ]. CAT and SOD activities significantly elevated in sugar beet under drought compared with control, this increase may be due that CAT and SOD are antioxidant enzymes, which involved in the tolerance of various stresses, SOD is the first defense wall in oxidative damage in the cells and play a key role in alteration of O 2 ●− radicals to H 2 O 2 and oxygen (O 2 ) [ 79 ].…”

“…Our findings showed the valuable effects of Si or proline or the combined application of Si + proline on drought-stressed sugar beet compared with untreated stressed plants. The important impact of Si may be due to its role in improving electron transport chain and enzyme stimulation, this positive role of Si was reported in many plants [ 8 , 39 , 42 ].…”

“…The remarkable increases in NPK was recorded in the current research due to Si+ proline application, this increase might be due to the role of Si in improving membrane H ± ATPase activity which enhances element uptake, mainly K + and Ca + and improve photosynthesis and water relations [ 83 ]. The helpful impact of Si on nutrient content was observed in some plants [ 8 , 42 ] and that could be explained by the regulation of key enzyme activity in the phenylpropanoid pathway [ 84 ] and the improvement of total phenol formation [ 85 ]. The role of proline in increasing NPK content under drought could be due to that proline is an amino acid and involved in increase plant tolerance to stresses by enhancement plant metabolism as well as increase nutrients uptake [ 86 ] as well as increase energy production in the electron transport chain and ATP synthesis [ 87 ].…”

“…It has been stated that under abiotic stress, proline application induces alterations at the structural and ultrastructural levels in the stressed plants, such as improve plant root surface as a strategy to deal with water and nutrient shortage [ 40 ]. Interestingly, the positive effect of proline was observed in increased roots number and induced structural alterations in stems and leaves in rice plant under salt stress [ 41 ], additionally, the application of proline increased water relations and yield of sugar beet under water drought [ 42 ]. It is well established that Si is an essential element in increasing drought stress tolerance and alleviate the mineral nutrient shortage in plants [ 43 ].…”

Effects of cadmium stress on physiological indexes and fruiting body nutritions of Agaricus brasiliensis

“…The PRO concentration in cells, tissues and plant organs is regulated by the interaction of biosynthesis, degradation and intercellular transport. It is well known that PRO protects plants from stress, protects membrane integrity and stabilizes antioxidant enzymes by acting as a cell osmotic regulator between cytoplasm and vacuole, by detoxifying free radicals and buffering cell redox potential, and by stabilizing mitochondrial electron transport complex II, membranes, proteins and enzymes (such as Rubisco) 38 . The results showed that the level of ROS and other free radicals could be reduced by a certain concentration of PRO, so as to reduce the oxidative damage of plants.…”