渗透胁迫下氮磷钠配方对多浆旱生植物霸王生长的影响

Effects of the N-P-Na recipe on growth of Zygophyllum xanthoxylumunder different osmotic stress

以多浆旱生植物霸王(Zygophyllum xanthoxylum)为材料,采用砂培试验,研究了适量的氮磷钠配方对霸王生长和抗旱性的影响。结果表明,15mmol·L-1 NaNO3和0.5mmol·L-1 NaH2PO4为霸王生长最适浓度。根据最适的氮、磷、钠3种元素的浓度配制成氮磷钠配方(15mmol·L-1 NaNO3+0.5mmol·L-1 NaH2PO4+34.5mmol·L-1 NaCl)。在-1MPa处理下,与对照相比,氮磷钠配方处理的霸王植株的叶干质量、组织含水量、叶面积、叶相对有机干质量和株高分别增加了12%、121%、57%、10%和14%,同时,叶片丙二醛含量和相对质膜透性分别下降了64%和17%。因此,在渗透胁迫下,氮磷钠配方对霸王的生长起到了促进作用,减轻了细胞膜的受损程度,增强了霸王的抗旱能力。

In the present study,we developed a N-P-Na recipe concluding appropriate amount of nitrogen,phosphorous and sodium by sand culture to promote the growth and enhance the drought tolerance of a succulent xerophytes Zygophyllum xanthoxylum.Treatment with 15 mmol·L-1 NaNO3 and 0.5mmol·L-1 NaH2PO4was the most optimal concentration and selected as the material of N-P-Na recipe.A kind of N-P-Na recipe(15mmol·L-1 NaNO3+0.5mmol·L-1 NaH2PO4+34.5mmol·L-1 NaCl)was developed according to the most optimal concentration of N,P and Na.Compared with control plants,leaf dry weight,water content,leaf area,relative organic weight and plant height with this recipe increased by12%,121%,57%,10% and 14%,respectively.However,MDA content and relative penetrability of membrane in leaves decreased by 64%and 17%.Therefore the N-P-Na recipe can improve the growth and alleviate water stress of Z.xanthoxylumunder osmotic stress.