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Efforts of drought resistance characteristics and mechanism of the compensation in Ulmus parvifolia Jacq seedlings

ZHANG Qingyu;LI Cunhua;YANG Qingshan;ZHOU jian;ZHANG Dong;College of Forestry Shandong Agricultural University;Shandong Academy of Forestry;Shandong Taishan Administrative Committee;  
Ulmus parvifolia Jacq seedlings are studied on different drought stress and rehydration compensation and identify of osmotic adjustment solute and protective enzyme activity in order to explore the drought tolerance and compensation mechanism of the Ulmus parvifolia Jacq seedlings and provide theoretical basis for the further study of stress tolerance and compensatory effect of Ulmaceae plants. The results showed that the content of osmotic adjustment solute(soluble protein,soluble sugars,free proline) and protective enzyme activities(SOD,POD) trend of increasing first and then decreased generally in the drought, then slowly decreased after rewatering; and the content of osmotic adjustment substance changed with different alternation times, the specific expression was T3 T1 T2, which indicated that T2 had a certain adaptability to drought after one resistance exercise. These indicate that Ulmus parvifolia has some abilities to adapt the drought environment by regulating the internal osmotic adjustment solute and activities of protective enzymes,but more drought stress might lead to a certain effect on the growth of Ulmus parvifolia Jacq.
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