%0 Journal Article
%T 北京地区引种七叶树苗期对低温胁迫的生理响应<br>Physiological Response to Low Temperature Stress in Seedling Stage of Introduction of Aesculus chinensis in Beijing Area
%A 刘春和
%A 冯天爽
%A 彭祚登
%A 姚妮尔
%A 张青
%J Botanical Research
%P 184-195
%@ 2168-5673
%D 2021
%I Hans Publishing
%R 10.12677/BR.2021.102027
%X <div style=\"text-align:justify;\">
	<span style=\"font-size:14px;line-height:1.5;\">天然生长于我国秦岭地区的七叶树在北京地区栽培存在幼龄期对冬季低温的适应性问题。研究以陕西汉中七叶树1年生幼苗为试验材料，通过人工模拟温控环境处理试验，选取七叶树苗木枝条内测定在？20℃~0℃下可溶性蛋白等8个生理指标的变化，为七叶树幼苗在北京地区冬季越冬防寒害措施的制定提供参考依据。结果表明，七叶树幼苗低温半致死温度为LT<sub>50</sub> = ？25.46℃；随着温度的降低，相对电导率、丙二醛呈上升趋势；在低温胁迫下，七叶树的相对电导率具有<img src=\"Edit_0b97b284-7bcd-4cd3-8ad7-d7e727fea258.jpg\" alt=\"\" /> 的变化规律；渗透调节系统中的可溶性糖、可溶性蛋白、脯氨酸含量随着温度的降低逐渐增加，脯氨酸含量增幅高达63.87%；温度在？15℃~0℃之间，保护酶系统中的超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)在？5℃以下低温环境下存在活性减弱甚至失活的变化，其中超氧化物歧化酶在？5℃以内，其活性无显著变化，过氧化氢酶和过氧化物酶在？10℃以内无显著变化。研究表明，北京地区冬季低温环境对原产秦岭地区的七叶树1年生幼苗具有一定的影响，冬季苗木户外越冬需要采取防寒措施。<br />
The adaptation of young age to low temperature in winter in Beijing is a problem in the cultivation of Aesculus chinensis Bunge naturally grown in Qinling region of China. The experimental materials is 1-year-old seedling of Aesculus chinensis in Hanzhong, Shaanxi Province by artificial simulation of temperature control environment treatment test, the annual dormant shoots of Aesculus chinensis was used to measure its physiological response to low temperatures from 0 to ？20？C using eight indices such as soluble protein, etc. The aim is to provide reference for the establishment of winter cold prevention measures for Aesculus chinensis seedlings in Beijing. The results are shown that under low temperature stress, the regression equation of relative conductivity of Aesculus chinensis Bunge was <img src=\"Edit_507d1ac6-4faa-4d4c-b524-b28c37ceae64.jpg\" alt=\"\" />; low temperature semi-lethal temperature of seedling of Aesculus chinensisis LT50 = ？25.46？C, the relative conductivity and malonaldehyde increased with the decrease of temperature, and the content of soluble sugar, soluble protein and proline in osmotic regulation system increased with the decrease of temperature, and the content of proline increased up to 63.87%. The superoxide dismutase, catalase and peroxidase in protective enzyme system played a certain role at temperatures ranging from ？15？C to 0？C, and at low temperatures below ？5？C there are changes in activity weakening or even deactivation, in which the activity of superoxide dismutase did not change significantly within ？5？C, catalase and peroxidase did not change significantly within ？10？C. It is concluded that the low temperature environment in winter in Beijing area has a certain influence on the annual seedlings of Aesculus chinensis in the native Qinling area and winter seedling outdoor overwintering needs to take cold prevention measures. </span> 
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%K 七叶树，低温胁迫，抗寒性，生理响应<br>Aesculus chinensis Bunge
%K Low Temperature Stress
%K Cold Resistance
%K Physiological Response
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=41418