The Growing And Physiological Response Of Baodao Banana In Seawater Agriculture

Baodao banana is one of the main banana cultivars in China. But on its production some searious problems seriously affected banana production and industrial development such as uneven distributed annual rainfall and seawater intrusion land leaded by typhoon. Therefore, in order to solve these problems, seawater must be exploitated scientificly and effectly, at the same time, improve the cultivation environment of high salt soil. In this test, we used different concentrations (5%?10%and20%) of seawater to hydropon Baodao banana, after Od?3d?6d?9d and12d, we determined photosynthesis?root-shoot ratio?electrical conductivity and so on(use0%as the control). After that we use principal component analysis to select tolerance indices. In another test, we used normal soil and salt water intrusion soil to plant of Baodao banana, after0d?5d?10d?15d and20d, we determined photosynthesis?root-shoot ratio?electrical conductivity and so on(use normal soil as the comparison). Desirable to provide a theoretical basis and guidance seawater irrigation agriculture in the banana industry and seawater agriculture of banana.Different concentrations of seawater treatment test results were:1. Low concentration (5%) made root-shoot ratio significantly higher than the control and RWC not significantly than the control, this concentration were favored to leaves to absorb water; High concentration10%and20%) treatment made root-shoot ratio and RWC significantly lower than the control and decreased significantly with the increase of treatment time and concentration, and shoot is more significant than roots.2. Root activity with increasing treatment time and treatment concentration was significantly lower than the control, and not significant between hign concentration (10%and20%).3. Chlorophyll of each treatment was significant differences between treatments, significantly lower than the control, and with the increase of treatment time and treatment concentration decreased significantly; Pn?Tr?Gs and Ci of low concentration (5%) changed or reduced not significant, Pn^Tr and Gs of hign concentration (10%and20%) decreased significantly compared to the control, and Ci increased significantly, low concentration (5%) was in favor of Baodao banana seedlings photosynthesis.4. Membrane permeability of each treatment was significantly higher than the control, and with the increase of treatment time and treatment concentration increased significantly; leaves MDA content of low concentration (5%) was significantly lower than the control, root MDA content was not significant than the control, leaves and roots MDA content of hign concentration (10%and20%) significantly higher than the control, relative Membrane permeability was higher than50%, it meaned roots damage was unrecoverable, above all, the damage of roots by low concentration (5%) treatment was more serious than leaves.5. Proline content and soluble sugar content of low concentration (5%) were not significant than the control, and with no significant increase in processing time; proline content?soluble sugar content and soluble protein content of hign concentration (10%and20%) were significant between treatments and significant than control, and with the increase in processing time significantly increased; after20%concentration of seawater in a long time soluble protein content of roots was significantly decreased20.58%than the10%treatment.6. SOD and POD activity of each treatment were not significantexes, but they significant than control, each treatment was lead to the increase of Baodao banana active substance, and it start up the regulatory mechanisms of protective enzyme system.7. Ca2+content of low concentration (5%) was significant increase10.38%compared to the control, and in roots it was significant higher than other treatments, and it indicated that low concentration (5%) was favored to Baodao banana to absorption and accumulation Ca2+; K+/Na+was significant lower than the control in each treatment, and it was significant different among the treatments, it showed that Ion balance of Baodao banana cells was broken, and the normal function of cells was suppressed.8. We used principal component analysis to select the index, as a result soluble protein content of leaves?soluble sugar content and Membrane Permeability and so on could be used as salt evaluation index.Above all, low concentration (5%) can help Baodao banana to adapt salt environment, hign concentration (10%and20%) caused salt damage of Baodao banana.The results of the treatment of Baodao banana in normal and salt water intrusion soil were as follows:1. Soil cultivation Processing shoot ratio and low concentrations (5%) of seawater treatment variation similar to seawater intrusion; salt water intrusion soil made leaves appear dehydration phenomenon, the result of RWC?chlorophyll content and roots activity were similar with high concentrations (10%and20%), the decrease of chlorophyll content leaded to the suppression of photosynthesis.2. Membrane Permeability and MDA content were significant higher than the control. 3. Soluble protein content of leaves?soluble sugar content and proline content were significant higher than the control, it shows that Baodao banana can adapt high salt soil by osmotic adjustment.4. SOD and POD activity of each treatment were significant stronger than the control, it shows that Baodao banana can remission active oxygen damage that caused by high salt soil environment by enhancing the activity of protective enzymes.5. Ca2+content and K+/Na+were significant lower than the control, Ion balance of Baodao banana cells was broken by high salt soil environment.In summary, in salt water intrusion soil environment, Baodao banana can control and adapt high salt environment by osmotic adjustment and enhancing the activity of protective enzymes.