Accumulation and Distribution Dynamics of Soluble Carbohydrate in Helianthus tuberosus under Drought Stress

With Qingyu 1 and Qingyu 2 as test materials,variation of soluble carbohydrate content in different parts were studied under two types of artificially simulated drought stress( polyethylene glycol PEG-6000 stress and water-controlling stress). The results showed that under the stress of PEG,soluble carbohydrate content in leaves of Qingyu 1 and Qingyu 2 increased with the prolonging time of stress; soluble carbohydrate content in stems of Qingyu 1 did not show regular changes with the prolonging time of stress,while 30% PEG stress received the best effect on Qingyu 2 after 24h; soluble carbohydrate content in roots of Qingyu 1 and Qingyu 2 increased with the prolonging time of stress. Under different intensities of water-controlling stress,soluble carbohydrate content in leaves of Qingyu 1 first increased then decreased,while that in leaves of Qingyu 2 increased; soluble carbohydrate content in stems of Qingyu 1 and Qingyu 2 increased with the prolonging time of water-controlling stress; soluble carbohydrate content in roots of Qingyu 1 decreased with the prolonging time of water-controlling stress,while that in roots of Qingyu 2 differed slightly.