Study Of Salt Tolerance Physiology Of The Tomato

In China, the terrain span of Salina distributing is quite great, and its type is multiplicity. There is more than 600 thousand ha Salina. It mostly in the west region and the soil basification is continuing enlarged. Its salinity give priority to the alkalescency salt type such as Na₂CO₃, it calls soda Salina soil and disadvantage to the crop growth. Protected cultivation is an important mode of vegetable produce. Because of the especial environment condition of protected cultivation, it usually can make the soil pickled in 2³ years. It can result in the restrain of vegetable growth and germination rise of nitrate inner and the decline of vegetable quality. At present, the plant's salt tolerance study mostly focus on field crops, less on vegetables especially the tomato. And it is the major vegetable type of protected cultivation. Therefore it has important meaning to the tomato protected cultivation, salt tolerance breeding and make use of Salina in reason. Study the growth rule and salt tolerance mechanism of tomato in salt stress condition and discuss the salt tolerance difference of different type tomato and the physiological reaction of different pickled soil is very important.This test use the Na₂CO₃ stresses the individual plant of tomato. And analyses the salt tolerance in burgeon period, seedling period and field vegetal period of tomato seeds. The result indicates that the salt tolerance capability is different in Salt stress condition and different period of differ tomato types. The evaluate target of resist Na₂CO₃ stress capability is Germination rate, Germination index, Vigor index, root system vigor, content of MDA, content of proline and relative conductance. Salt stress restrains the seed germination. When the salt concentration is more than 20mmol/L, the seed germinate falls under the obvious restrain. The salt stress is minus mutuality to the Germination rate, Germination index and Vigor index.There is a rule to the influence of burgeoning period, seedling period and field vegetal period of tomato seeds in salt stress condition. With the increase of Na₂CO₃ concentration, the membranous penetrated character inner is increasing and the selectivity is depressing. More over, the salt stress time longer, the scathing degree of plastid membrane greater. The inner praline and infiltration and adjust matter of soluble sugars small molecule increased. The activity of POD and SOD is raised rapidly.The test result indicates that the relative increment of protective enzyme activity is plus mutuality to the salt tolerance of tomato breed. In salt stress condition, the chlorophyll and the content of Chla and Chlb in tomato lamina submit the downtrend. And the Chla/b value of chlorophyll submits the uptrend in high salt stress condition. The individual plant of tomato can suffer from the Na₂CO₃ concentration below 40 mmol/L. With the increase of Na₂CO₃ concentration, the content of Na⁺ increasing rapidly,...