%0 Journal Article
%A Jun QIN
%A Kang YE
%A Li ZENG
%A Xiwu DU
%A Yan LIANG
%A Yanxiang SHEN
%A Yiwei TAO
%A Yonghong HU
%A Yongzheng PENG
%T Effects of Flooding Stress on Photosynthetic Characteristics of <i>Yulania stellata</i> and Its Cultivars
%D 2022
%R 10.7525/j.issn.1673-5102.2022.03.018
%J Bulletin of Botanical Research
%P 483-491
%V 42
%N 3
%X <p>In order to clarify the response rules of photosynthetic and physiological characteristics of <i>Yulania stellata</i> to flooding stress， the double-pot method was used to <i>Y. stellata</i> and its 4 cultivars by flooding. The changes in chlorophyll content， specific leaf area， photosynthetic parameters and chlorophyll fluorescence parameters after different flooded days were measured respectively. The results showed that the changing trends of chlorophyll a， chlorophyll b and total chlorophyll were slightly different under flooding stress， and there were no significant changes in <i>Y.</i> ‘（Mag’s） Piroutte’ and <i>Y.stellata</i> ‘Chrysanthemiflora’， while <i>Y.</i>‘Bety’， <i>Y.stellata</i> and <i>Y.</i>‘Judy’ showed a downward trend respectively. The net photosynthetic rate（<i>P</i><sub>n</sub>） showed a downward trend， and the maximum net photosynthetic rate（<i>P</i><sub>nmax</sub>） and light saturation point（<i>LCP</i>） of the treatment groups were significantly lower than those of the control group respectively. The dark respiration rate（<i>R</i><sub>d</sub>） of <i>Y. stellata</i> ‘Chrysanthemiflora’ and <i>Y.</i> ‘（Mag’s）Piroutte’ of the treatment group was higher than that of the control group. The Rd of <i>Y.</i> ‘Bety’， <i>Y. stellata</i> and <i>Y.</i> ‘Judy’ were significantly reduced after flooding treatment to reduce the consumption of photosynthetic products respectively. The effective photochemical quantum yields（<i>Φ</i><sub>PSⅡ</sub>） of <i>Y.</i> ‘（Mag’s）Piroutte’ and <i>Y.</i>‘Judy’ decreased by 8.4% and 24.7% under flooding stress； <i>Y.stellata</i> ‘Chrysanthemiflora’， <i>Y.</i>‘Bety’ and <i>Y.stellata</i> decreased significantly， respectively 76.7%， 85.7% and 64.6%. The maximum photochemical quantum yield（<i>F</i><sub>v</sub>/<i>F</i><sub>m</sub>） of each cultivar of <i>Y.stellata</i>. had a downward trend. The photosynthetic characteristics of <i>Y.stellata</i> and<italic/>its cultivars were affected by flooding stress， but different cultivars had differences. Except for <i>Y.</i>‘Bety’， the Photosynthesis of the other 4 <i>Y.stellata</i> cultivars performed normally during the 7 d before treatment； <i>Y.</i> ‘（Mag’s）Piroutte’ had strong photosynthetic capacity and waterlogging adaptability. The results provid a theoretical basis for the selection of <i>Y.stellata</i> cultivars suitable for planting in wet and waterlogged areas in southern China.</p>
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2022.03.018