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Over-Expression of Masson Pine PmPT1 Gene in Transgenic Tobacco Confers Tolerance Enhancement to Pi Deficiency by Ameliorating P Level and the Antioxidants
Plant Molecular Biology Reporter ( IF 2.1 ) Pub Date : 2020-01-16 , DOI: 10.1007/s11105-019-01170-5
Ting Zhang , Yi Hong , XiaoPeng Wen

Previously, we cloned the full sequence of masson pine (Pinus massoniana) phosphate transporter gene (PmPT1) from a phosphorus (Pi) deficiency tolerant strain. To further verify whether PmPT1 presumably function in angiosperms, i.e. tobacco, as well as to generate the new germplasm with high tolerance to Pi deficiency, currently, this gene was transferred into tobacco (Nicotiana tabacum) through Agrobacterium-mediated method. PmPT1 chiefly expressed in the roots of the transgenic plants, and considerably promoted the expression of two endogenous phosphate transporter genes of tobacco (NtPT1 and NtPT2) irrespectively of Pi status. Under low Pi conditions, the total P contents of the roots and shoots increased by 33.3% and 25.5%, respectively in L7, and by 30.7% and 23.9%, respectively in L18 in comparison with those of the wild type (WT). Also, the inorganic phosphorus (Pi) content of whole plants in L7 and L18 increased by 42.9% and 42.3%, respectively compared to the WT. The dry weight, contents of chlorophyll, soluble sugar and soluble protein, as well as the activities of peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) were significantly elevated, conversely the MDA accumulation was obviously decreased in transgenic lines compared to the WT. Therefore, PmPT1, a phosphate transporter gene of Pht1 family from masson pine might function in tobacco and two overexpressed-PmPT1 transgenic lines substantially enhanced the tolerance of the transgenic tobacco to low-P stress, which was at least chiefly ascribed to the improvement of P accumulation and oxidant alleviation.

中文翻译:

马尾松 PmPT1 基因在转基因烟草中的过度表达通过改善 P 水平和抗氧化剂增强对缺磷的耐受性

以前,我们从耐磷 (Pi) 菌株中克隆了马尾松 (Pinus massoniana) 磷酸盐转运蛋白基因 (PmPT1) 的完整序列。为进一步验证PmPT1是否可能在被子植物即烟草中发挥作用,以及产生对缺磷具有高耐受性的新种质,目前将该基因通过农杆菌介导的方法转入烟草(Nicotiana tabacum)中。PmPT1 主要在转基因植物的根部表达,并且无论 Pi 状态如何,都显着促进了烟草两种内源性磷酸盐转运蛋白基因(NtPT1 和 NtPT2)的表达。在低磷条件下,与野生型(WT)相比,L7 根和地上部的总磷含量分别增加了 33.3% 和 25.5%,L18 分别增加了 30.7% 和 23.9%。还,与野生型相比,L7 和 L18 中整株植物的无机磷 (Pi) 含量分别增加了 42.9% 和 42.3%。转基因株系的干重、叶绿素含量、可溶性糖和可溶性蛋白含量以及过氧化物酶(POD)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的活性显着升高,相反,与转基因株系相比,MDA的积累明显减少。到 WT。因此,马尾松 Pht1 家族磷酸盐转运蛋白基因 PmPT1 可能在烟草中发挥作用,两个过表达的 PmPT1 转基因品系显着增强了转基因烟草对低磷胁迫的耐受性,这至少主要归因于磷的改善。积累和氧化缓解。分别与 WT 相比。转基因株系的干重、叶绿素含量、可溶性糖和可溶性蛋白含量以及过氧化物酶(POD)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的活性显着升高,相反,与转基因株系相比,MDA的积累明显减少。到 WT。因此,马尾松 Pht1 家族磷酸盐转运蛋白基因 PmPT1 可能在烟草中发挥作用,两个过表达的 PmPT1 转基因品系显着增强了转基因烟草对低磷胁迫的耐受性,这至少主要归因于磷的改善。积累和氧化缓解。分别与 WT 相比。转基因株系的干重、叶绿素含量、可溶性糖和可溶性蛋白含量以及过氧化物酶(POD)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的活性显着升高,相反,与转基因株系相比,MDA的积累明显减少。到 WT。因此,马尾松 Pht1 家族磷酸盐转运蛋白基因 PmPT1 可能在烟草中发挥作用,两个过表达的 PmPT1 转基因品系显着增强了转基因烟草对低磷胁迫的耐受性,这至少主要归因于磷的改善。积累和氧化缓解。超氧化物歧化酶 (SOD) 和过氧化氢酶 (CAT) 显着升高,相反,与 WT 相比,转基因品系中 MDA 的积累明显减少。因此,马尾松 Pht1 家族磷酸盐转运蛋白基因 PmPT1 可能在烟草中发挥作用,两个过表达的 PmPT1 转基因品系显着增强了转基因烟草对低磷胁迫的耐受性,这至少主要归因于磷的改善。积累和氧化缓解。超氧化物歧化酶 (SOD) 和过氧化氢酶 (CAT) 显着升高,相反,与 WT 相比,转基因品系中 MDA 的积累明显减少。因此,马尾松 Pht1 家族磷酸盐转运蛋白基因 PmPT1 可能在烟草中发挥作用,两个过表达的 PmPT1 转基因品系显着增强了转基因烟草对低磷胁迫的耐受性,这至少主要归因于磷的改善。积累和氧化缓解。
更新日期:2020-01-16
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