Effect Of Different Waterlogging Stress On The Growth And Physiological And Biochemical Characteristics Of Amorpha Fruticosa Seedlings

In recent years, heavy rains caused by global warming and excessive logging resulted in serious flood disasters and debris flows in many rain-belts frequently. In the disaster areas, water flooding brought about terrestrial vegetation degeneration and biodiversity decrease. Because of the water storage and drainage in reservoirs, community structure simplified. So choosing and cultivating those plant species that can survive after a long-or short-term submergence resistance has important ecological significance.The changes of growth and physiological characteristics in Amorpha fruticosa seedlings under different waterlogging stress condition were studied by carrying out a water soaking treatment. The result showed that:1The nutritive growth had no obvious change, while a mass of aquatic adventitious roots and specialized lenticels grew in a short time to adapt the different waterlogging stress.2Chlorophyll contents in leaves and photosynthetic rate decreased differently in the different flooding treatment, and had obvious change with the control group (P<0.05), the main influencing factor in surface submerge and semi-submerge waterlogging was the decrease of stomal condunctance, while the the main influencing factor in the nearly submerge waterlogging is he increase of Ci.3Root activity of the surface submerge waterlogging treatments decreased insignificantly, while it fell by58%between in the semi-submerge waterlogging treatments and the control group, and51%between the nearly submerge waterlogging treatments and the control. Soluble protein and proline content in waterlogging treatments were all more than that in the control group,while the semi-submerge waterlogging treatments had the highest contents of them with the quantity22.43mmol/L and570μg/g respectively, and had obvious change with the control group (P<0.05). These samples showed no change in the Malondialdehyde(MDA)4Under different waterlogging stress, the endogenous plant hormones of leaves and roots of Amorpha fruticosa responded complicatedly. High concentrations of abscisic acid (ABA) caused the decrease of stomal condunctance and photosynthetic rate. Simultaneously, it promoted the accumulation of praline and soluble sugar.There might be antagonistic effect between zeation and ABA, and auxin and zeatin can promote the diffrerentiation of callus and the occurrence of the root originating.The above results indicated that Amorpha fruticosa could adapt waterlogging stress by the growing of a lot of aquaticadventitiousroots and specialized lenticels and accumulating of osmotic adjustment substance. Amorpha fruticosa had a strong waterlogging tolerance ability, it could be planted in rain-belts and wetlands...