摘要:钾是植物生长发育所必需的三大营养元素之一,对植物的生长发育过程发挥着十分重要的作用。OsHAKb是水稻钾转运体 KUP/HAK/KT家族的成员,其与K+结合后构象发生变化,将K+转运过膜。我们的研究发现,OsHAKb 基因的表达虽然不受低钾胁迫诱导;但是在低钾胁迫下 OsHAKb 的敲除突变体oshakb-1较野生型表现出冠部生长受到明显抑制,叶片泛黄,心叶完全枯萎的表型。而钾离子含量测定实验表明低钾处理下oshakb-1冠部钾离子含量明显高于野生型水稻钾离子, 暗示oshakb-1叶片泛黄,心叶完全枯萎的表型可能并不是由于叶片缺钾导致的,其具体生理机制还有待进一步研究。 25301
毕业论文关键词:低钾;OsHAKb;钾离子含量;生长发育;
Preliminary Study on Physiological Function of Potassium Transporter OsHAKb in Rice
Abstract: Potassium is one of the three essential nutrients,which plays important roles in the plant growth
and development. OsHAKb is a member of the KUP / HAK / KT family of potassium transporter in rice.
Our study showed that the expression of OsHAKb gene was not induced by low potassium stress. Under the
low-potassium stress, the oshakb-1 mutant, whose OsHAKb gene was knocked of , showed that the crown
growth was significantly inhibited, the leaves turned into yellowed and the heart leaves was completely
withered. And the content of potassium ion in leaves of oshakb-1 rices was significantly higher than that of
wild type rices, it indicated that the morphological characteristic that the oshakb-1 mutants’ leaves were
yellowed and the heart leaves were completely withered was not due to lack of potassium , but its specific
physiological mechanism remains to be further studied.
Key words: low potassium;OsHAKb ; the content of potassium ion ; growth and development ;
目 录
摘要1
关键词1
Abstract1
Key words1
引言(或绪论)1
1 材料与方法2
1.1 材料 2
1.2 方法 2
1.2.1 水稻苗培养和低钾处理 2
1.2.2 植物总 RNA 提取 3
1.2.3 定量 PCR 3
1.2.4 叶绿素含量测定4
1.2.5 离子含量的测定4
1.2.6 水稻总DNA小量提取4
1.2.7 载体构建4
2 结果与分析7
2.1 野生型水稻中OsHAKb基因的表达不受低钾胁迫诱导 7
2.2 野生型及 oshakb-1 突变体水稻在低钾胁迫下的表型分析7
2.2.1 低钾胁迫显著抑制oshakb-1突变体冠部的生长 8
2.2.2 低钾胁迫下,突变体冠部较野生型表现出发黄的表型 8
2.2.3 低钾处理后,突变体的叶宽较野生型更窄,且心叶明显枯萎9
2.3 oshakb-1 突变体水稻冠部的钾离子含量较野生型高10
2.4 HAKb-p7T7 载体的构建10
3 讨论 11
致谢12
参考文献12 引言:钾(K+)是植物体内最丰富的无机一价阳离子,占植物干重的 3%~5%,对植物的生
长发育过程发挥着十分重要的作用。其可作为植物细胞内多种酶的催化剂,参与植物多
种生理生化过程,包括蛋白质合成、渗透调节、气孔运动、光合作用和细胞伸长等[5]
,钾离子作为最主要的渗透物质,在作物-水分关系的调节中亦发挥着作用[1]
。此外,植物本身的K营养状况和适应 Na毒害作用的能力决定了植物对盐的耐受能力。
在漫长的进化过程中,植物形成了一套复杂的钾吸收转运系统。植物根部细胞主要
通过 2 种机制吸收 K+,一是在外部低 K+(0.001~0.2mmol/L)条件下起作用的高亲和钾转
运机制(high affinity K+ transportmechanism),主要由高亲和性K+转运体完成,目前已鉴 水稻钾转运蛋白OsHAKb生理功能初探:http://www.youerw.com/shengwu/lunwen_19001.html