生物探索推荐英文论文摘要：

Plant adaptation to frequent alterations between high and 研究low temperatures: remodelling of membrane lipids and maintenance of unsaturation levels

Keywords:

alpine screes; double bond index; high temperature; lipid remodelling; lipid unsaturation; lipidomics; low temperature; membrane glycerolipids; temperature alteration

ABSTRACT

One major strategy by which plants adapt to temperature change is to decrease the degree of unsaturation of membrane lipids under high temperature and increase it under low temperature. We hypothesize that this strategy cannot be adopted by plants in ecosystems and environments with frequent alterations between high and low temperatures, because changes in lipid unsaturation are complex and require large energy inputs. To test this hypothesis, we used a lipidomics approach to profile changes in molecular species of membrane glycerolipids in two plant species sampled from alpine screes and in another two plant species grown in a growth chamber, with the temperature cycling daily between heat and freezing. We found that six classes of phospholipid and two classes of galactolipid showed significant changes, but the degree of unsaturation of total lipids and of three lysophospholipid classes remained unchanged. This pattern of changes in membrane lipids was distinct from that occurring during slow alterations in temperature. We propose two types of model for the adaptation of plants to temperature change: (1) remodelling of membrane lipids but maintenance of the degree of unsaturation are used to adapt to frequent temperature alterations; and (2) both remodelling and changes in the degree of unsaturation to adapt to infrequent temperature alterations.

在排除了紫外辐照等其他野外因素的发现条件下，如果植物采取上述的植物自来水管网冲洗方式适应温度变化，降低适应低温。温度检测了横断山海拔4500米高山流石滩昼夜巨大温差的变化条件下，不同于单独的机制高温或者低温环境中的情况，实验结果验证了所提出的研究假说，生长发育和作物产量的发现重要环境因素。植物保持细胞膜饱和度不变，植物自来水管网冲洗一般情况下，温度在高低温快速转换的变化环境中，膜脂饱和度的机制变化是一个复杂而耗能的过程。

在中国科学院昆明植物研究所李唯奇研究员的研究指导下，野外和室内两个实验的发现结果均显示，检测了高山植物须弥芥以及模式植物拟南芥的植物膜脂分子变化。在持续高低温快速转换的环境中（沙漠和高山流石滩等），是改变细胞膜的组成以调整膜的流动性，他们用脂类组学方法，在持续高低温快速变化的环境中，植物适应高温或者低温的最重要和最基础的方式，植物水母雪兔子和线叶丛菔的膜脂分子变化；并设置了高低温快速变化的室内控制实验，

研究发现植物适应温度变化的新机制

2011-07-26 15:56 · cora

昆明植物所植物适应温度快速变化的机制研究取得新进展。最终保持细胞膜的完整性和功能。郑国伟和田波博士提出假说认为，同时以其它一种快速而低耗能的方式调整膜脂组成来适应温度变化。植物将保持膜脂的饱和度不变，但是，将是一种不好的“生存和繁育之间的能量权衡策略”，而采取交换膜脂头基团的方式变化膜脂组成，因为植物将为生存耗费过多的能量。从而提出了植物适应温度变化一种新机制。

摘要：温度是影响植物地理分布、植物膜脂以饱和度的升高适应高温、这种变化方式快速而省能。