摘要
低温严重危害了林业生产,是影响林业发展的重要自然灾害。目前,关于低温胁迫下林木的生理响应特征方面的研究已经取得了一定进展。本文综述了低温胁迫下林木的生理响应特征,旨在为深入研究林木的抗寒机制提供参考。研究表明,低温胁迫会使林木对其光合作用、叶绿素含量和黄酮类物质的含量进行调节以应对低温胁迫。具体而言低温会降低光合作用的速率,这是由于低温抑制了酶的活性,减缓了气孔开放和CO_(2)的吸收速率,进而降低了光合作用的效率。这种降低可能导致植物生长速度减缓,产量下降。另外,低温会引发叶绿素含量的变化,但具体的变化趋势和程度仍存在差异。研究表明低温胁迫会降低或促进叶绿素的合成和积累。此外,低温胁迫也会促使林木合成和积累更多的黄酮类物质,以增强其抗寒能力和应对低温压力的能力。这些化合物具有抗氧化作用,可以减轻低温引起的氧化损伤,保护细胞的完整性。综上所述,林木的光合作用、叶绿素含量和黄酮类物质的变化在低温胁迫条件下发生了改变。未来的研究可以通过利用更加精密的技术手段,深入探究林木在低温环境下的分子机制,以加深对林木抗寒机制的理解并为改良林木品种、提高抗寒性能以及增加林业产量提供更多的参考。
Low temperature,as a key environmental factor,has a significant impact on plant growth and development,as well as yield.At the same time,low temperature is also one of the important natural disasters that endanger forestry production.At present,some progress has been made in studying the physiological response characteristics of trees under low temperature stress.This article reviewed the physiological response characteristics of trees under low temperature stress,aiming to provide reference for in-depth research on the cold resistance mechanism of trees.Research has shown that low temperature stress can regulate the photosynthesis,chlorophyll content,and flavonoid content of trees to cope with low temperature stress.Specifically,low temperature will reduce the rate of photosynthesis,as it inhibits enzyme activity,slows down stomatal opening and carbon dioxide absorption rate,thereby reducing the efficiency of photosynthesis.This decrease may lead to a slowdown in plant growth rate and a decrease in yield.In addition,low temperatures can cause changes in chlorophyll content,but there are still differences in the specific trend and degree of change.Some studies have shown that low temperature stress can reduce the synthesis and accumulation of chlorophyll,while others have found that low temperature can stimulate trees to increase chlorophyll synthesis.In addition,low temperature stress can also promote the synthesis and accumulation of more flavonoids in trees,enhancing their cold resistance and ability to cope with low temperature pressure.These compounds have antioxidant effects,which can alleviate oxidative damage caused by low temperature and protect cell integrity.In conclusion,the physiological response of trees to low temperature stress involves changes in photosynthesis,chlorophyll content,and flavonoids.Future research can delve deeper into the molecular mechanisms of trees in low-temperature environments through the use of more precise technological means,in order to deepen the understanding of the cold
作者
张兆涵
范梓晗
焦蕊
杨静莉
ZHANG Zhaohan;FAN Zihan;JIAO Rui;YANG Jingli(State Key Laboratory of Tree Genetics and Breeding,Northeast Forestry University,Harbin 150040,Heilongjiang;Harbin 49th Middle School,Harbin 150040,Heilongjiang)
出处
《温带林业研究》
2024年第1期38-41,46,共5页
Journal of Temperate Forestry Research
基金
东北林业大学本科生创新性实验项目(S202310225151)。
关键词
低温胁迫
林木
光合作用
叶绿素
黄酮
low temperature stress
forest
photosynthesis
chlorophyll
flavonoids
