%0 Journal Article
%A Fang WANG
%A Jian-Qiu ZHANG
%A Jun WANG
%A Shao-Chen LI
%A Shi-Kai ZHANG
%A Yu-Chun YANG
%A Yu-Xi LI
%A Zhi-Min LU
%T Photosynthetic and Stomatal Characteristics of <i>Pinus koraiensis</i> and <i>P.sibirica</i> under Low Temperature Stress
%D 2021
%R 10.7525/j.issn.1673-5102.2021.02.008
%J Bulletin of Botanical Research
%P 205-212
%V 41
%N 2
%X <p>Both <i>Pinus koraiensis</i> and <i>P.sibirica</i> with strong cold resistance are famous forest species in the cold temperate zone. Compared with <i>P.koraiensis</i>，<i> P.sibirica </i>has stronger cold resistance. In order to explore the physiological response and cold resistance mechanism of the two species under low temperature stress，<italic/>5-year-old <i>P.koraiensis</i> and <i>P.sibirica</i> seedlings were used to be conducted by low temperature treatment. By setting three stress temperatures（0℃， -20℃ and -40℃） and three stress times（6， 24 and 48 h）， taking 20℃ as control， which were used to study the photosynthetic characteristics and stomatal characteristics of <i>P.koraiensis</i> and <i>P. sibirica</i> under low temperature stress. By <i>t</i> test and variance analysis， there were significant differences （<i>P</i>&lt;0.05） between <i>P.koraiensis</i> and <i>P.sibirica</i> for each photosynthetic index and stomatal density， both low temperature and low temperature stress time had an extremely significant effect on each photosynthetic index of <i>P.koraiensis</i> and <i>P.sibirica</i>（<i>P</i>&lt;0.01）， and low temperature also had an extremely significant effect on stomatal opening size and stomatal area of <i>P.koraiensis</i> and <i>P.sibirica</i>（<i>P</i>&lt;0.01）. The net photosynthetic rate， stomatal conductance and transpiration rate in <i>P.koraiensis</i> were significantly higher than those in <i>P.sibirica</i> at 20℃（without stress） and 0℃（low temperature stress）. However， under -20℃ for 6 h， each photosynthetic index in <i>P.sibirica</i> was higher than that in <i>P.koraiensis</i>. With the decrease of temperature and the extension of stress time， each photosynthetic index of the two species showed a decreasing trend. The stomatal density in<i> P.koraiensis</i> was significantly higher than that in <i>P.sibirica</i>. Before stress（20℃）， the stomas of <i>P.koraiensis</i> and <i>P.sibirica</i> were all oval. The stomatal opening size and stomatal area of the two species decreased significantly with the decrease of temperature.</p>
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2021.02.008