Exogenous Sugar Alleviate Effects Of Salt Stress On The Sugar Metabolism And Photosynthetic Characteristics Of Triticale

Triticale is doubled by wheat and rye distant hybridization and chromosome number, by the artificial synthesis of a new type of wheat crops, is a new speci es of human creation. Triticale inherits the characteristics of high quality and high yield of wheat and rye, with cold resistance, disease resistance, stress resistance, adapt to the advantages of wide, can improve the ecological the environment, especially the improvement of saline alkali soil is good, but also has great Heterosis of distant source, photosynthesis ability and good nutritional quality, high biomass characteristics. Now in the global coverage of high salt area in the arid and semi-arid area to increase the proportion of dry years, so the changes of key enzymes in black wheat and sugar metabolism and sugar metabolism genes under salt stress and drought stress, on a deeper understanding of Triticale stress resistance ability and various abioti c stress on growth and quality of Triticale mining Triticale matter potential and utilization of Triticale is of great significance, so as to which would lay a good foundation for application of Triticale in manufacturing industry, feed production and protection of the ecological environment.The triticale cultivars Dongnong 8809 as materials, under salt(100 mmol ·L-1 Na Cl stress, inquiry with exogenous glucose(Glc and Suc) pretreatment on triticale seed germination period and seedling growth stage resistance to salt stress performance effects, exogenous glucose(Glc and Suc) in improving triticale resistance to salt stress function mechanism research. The following is main findings:In the non salt stress concentration 0.5 mmol·L-1 of exogenous glucose(Glc and Suc) solution on triticale seed soaking, triticale seed germination rate, germination potential and germination index were significantly improved. In salt stress conditions with the concentration of 0.5 mmol · L-1 of exogenous glucose(Glc and Suc) solution on triticale seed soaking can significantly relieve the triticale seed germination process by 100 mmol ·L-1 NaCl stress induced inhibition effect to a certain extent, improve small rye seed germination rate, germination potential and germination index. At the same time in the salt treatment conditions, exogenous Glc and Suc significantly improve the salt stress 5 d black wheat embryo, radicle, plumule fresh and dry weight and fresh and dry weight.In triticale seedlings under salt stress, exogenous Glc and Suc pretreatment can significantly promote triticale seedling growth and dry matter accumulation, alleviate the water loss of Triticale plant cells under salt stress, improvement of Triticale seedlings under salt stress conditions. The slow growth under salt stress, exogenous Glc, Suc the pretreatment can improve the content of soluble sugar in the leaves of triticale, improve crop protection ability and protoplast cell osmotic adjustment ability, and under the condition of salt stress, sugar metabolis m enzymes of Triticale leaves, including sucrose synthase, sucrose phosphate synthase, fructose-6- diphosphate kinase and hexokinase activity were higher than pyruvate kinase activity low, this shows that under salt stress, affect glucose metabolism of exogenous sugar on triticale body, can alleviate salt stress damage of triticale.Under salt stress, net photosynthesis of Triticale photosynthetic rate( Pn), stomatal conductance(Gs) and transpiration rate(Tr) were decreased; but with the prolongation of salt stress in triticale leaf intercellular CO2 concentration(Ci) in the first increased and then decreased in salt stress early(2 d), the non stomatal factors were the main factors leading to the decrease of photosynthesis, stomatal factors are mainly caused by photosynthesis in the late fall, namely triticale leaf under salt stress after 2 d, the photosynthetic apparatus was damaged chloroplast photosynthesis decreased, resulting in net photosynthetic rate( Pn) decreased in salt. Under salt stress, exogenous Glc and Suc pretreatment significantly slowed the net photosynthetic rate of Triticale leaves under salt stress(Pn), stomatal conductance(Gs), transpiration rate(Tr) decreased speed, salt stress 4 d, triticale leaf will CO2 into the efficiency of carbohydrates decreased because stomatal factors, cause Triticale Ci in leaves decreased, the rapid decline of the exogenous glucose(Glc and Suc) pretreatment of Ci, that of Glc and Suc to improve the leaf carbon assimilation ability, increased photosynthetic rate and maintain triticale leaf stomatal opening plays an important role, to salt stress under triticale leaves maintained higher photosynthesis helpful. Exogenous sugars can maintain the Pn of Triticale leaves in a high, exogenous sugars to regulation of photosynthesis by promoting plant growth.