不同EBR处理对低氧胁迫下马铃薯植株生长和光合作用的影响

以马铃薯品种Favorita为试验材料,研究了外源喷施不同浓度EBR(2,4-表油菜素内酯)处理对低氧胁迫下马铃薯植株生长发育的影响.结果表明,不同浓度EBR处理对低氧胁迫下马铃薯植株生长均有不同程度的促进作用.在处理的初期,高浓度EBR处理对低氧胁迫下马铃薯植株的株高和叶面积促进作用明显,而在处理的后期,中低浓度EBR处理效果明显；0.050和0.100 mg/L EBR处理对低氧胁迫下马铃薯植株的茎粗和匍匐茎数量促进作用明显；对于低氧胁迫下马铃薯光合作用和根系长度促进作用最明显的处理为0.050 mg/L EBR；不同浓度EBR处理对低氧胁迫下马铃薯植株的分枝数作用不明显.因此,对于促进低氧胁迫下马铃薯植株生长发育的EBR最适浓度为0.050 mg/L.

Effect of Different EBR Treatments on Plant Growth and Photosynthesis of Potato under Hypoxia Stress

The effect of different EBR(2,4-epibrassinolide) treatments on the growth and development of potato(Solanum tuberosum L.Favorita) plant under hypoxia stress was studied.The results showed that EBR could improve the growth of potato plant under hypoxic stress.In the early stage of EBR treatment,high concentration of EBR could significantly promote plant height and leaf area of potato plant;while in the later stage,low concentration of EBR had obvious promoting effect.There was a significant increase in the plant stem width and stolon number when treated with 0.050 and 0.100 mg/L EBR;0.050 mg/L EBR had the most obvious promoting effect on leaf photosynthesis and root length.But EBR had no obvious influence on the branch number of potato plant under hypoxia stress.Therefore,the optimal concentration of EBR was 0.050 mg/L,which could promote the growth and development of potato plants under hypoxia stress.