%A WANG Dan-Dan, ZHENG Guo-Wei, LI Wei-Qi %T Plants Adapt to LongTerm Potassium Deficiency by Accumulation of Membrane Lipids in Leaves and Maintenance of Lipid Composition in Roots %0 Journal Article %D 2014 %J Plant Diversity %R 10.7677/ynzwyj201413099 %P 163-176 %V 36 %N 02 %U {https://journal.kib.ac.cn/CN/abstract/article_33300.shtml} %8 2014-03-25 %X
Environmental stresses on plants can be divided into short and longterm types, which may be associated with different adaptation strategies. Adjustment of the composition of membrane lipid is a major response to stress. The membrane lipid composition may different between short and longterm environment stresses. A previous study reported changes in the lipid composition in barley root under shortterm potassium (K+) deficiency; however, the equivalent response of plants to longterm K+ deficiency remains completely unknown. Plants of Arabidopsis thaliana and Crucihimalaya himalaica (Brassicaceae) were grown at four different K+ levels (51,051,0051 and 0mmol·L-1) for 18 days. Physiological and biochemical experiments were conducted on this issue and the results suggest that Chimalaica, a relative of Athaliana, derived from a K+deficient area, is tolerant to K+limited conditions. Electrospray ionization tandem mass spectrometry (ESIMS/MS) was used to determine the lipid changes in Athaliana and Chimalaica subjected to longterm K+ deficiency. The results showed that: (1) the levels of total lipids and most lipid classes in leaves of Athaliana and Chimalaica increased under K+deficient conditions; (2) the changes in lipid content in leaves of Athaliana and Chimalaica were greater than those in the roots; (3) the change in lipid content in leaves of Chimalaica was greater than that in Athaliana, with the opposite trend being shown in the roots and (4) in Athaliana, the increase in phosphatidic acid (PA) corresponded to the decrease in phosphatidylethanolamine (PE). This indicates that K+deficiencyinduced PA in Athaliana was derived primarily from PE. Our results suggest that, at the cellular level, plants adapt to longterm K+ deficiency by the accumulation of lipids in leaves and maintenance of the lipid composition in roots.