التفاصيل البيبلوغرافية
| العنوان: |
水分胁迫对极小种群东兴金花茶幼苗光合特性的影响. |
| Alternate Title: |
Effests of water stress on photosynthetic characteristics of Camellia tunghinensis seedlings. |
| المؤلفون: |
唐健民1, 柴胜丰1, 邹 蓉1, 陈宗游1, 史艳财1, 蒋运生1, 韦 霄1 weixiao@gxib.cn |
| المصدر: |
Guihaia. dec2020, Vol. 40 Issue 12, p1764-1772. 9p. |
| مصطلحات موضوعية: |
*WATER efficiency, *SOIL moisture, *PHOTOSYNTHETIC rates, *PLANT-water relationships, *ENERGY conversion, *ENERGY consumption |
| Abstract (English): |
ln order to understand the adaptability and response mechanism of Camellia tunghinesis seedlings to water stress, a pot experiment was conducted to study the effects of different water control time on the Physiological and ecological characteristics of C. tunghinesis seedlings. The results were as follows: Net photosynthesis rate (Pn), stomatal conductance (Gs) and transpiration rate (Ty) decreased significantly with the extension of water control time and the aggravation of water stress; The variation trend of intercellular CO2 concentration (Ci) was low first and then high, and water use efficiency (WUE) was high first and then increased; The fluorescence parameters Fv/Fm and Fv/ Fo of C. tunghinesis seedlings first increased and then decreased continuously from 0. 806 to 0. 754 and 4. 17 to 3. 08, respectively, which showed that water stress reduced PS II primary light energy conversion efficiency, impaired the potential activity of PS II, and inhibited the primary reaction process of photosynthesis. Based on the above changes of physiological and ecological indexes of water stress and biological characters of leaves, C. tunghinensis could improve its own water use efficiency to resist drought in the case of water control time of 4 d, indicating that seedlings had certain adaptability and response mechanism to water stress. ln 8-12 d, the photnsynthetic indexes of C. tunghinernis decreased significantly, and soil water content decreased to 14.157%-15.065%, which leaf willing, curl, and lower than this level seedlings will die due lo excessive drought, indicating that the tolerance limit of C. tunghinernis seedlings to water stress was 14.157%- 15.065% of soil water content. The results of the study are helpful to the establishment of a suitable environment to ensure the normal growth and reproduction of C. tunghinensis, which is of important scientific significance to the conservation, cultivation and return to nature. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
为了解东兴金花茶幼苗对水分胁迫的适应能力和响应机制ꎬ该文以东兴金花茶１ 年生实生苗为材 料ꎬ采用盆栽控水试验ꎬ研究不同控水时间处理对东兴金花茶幼苗的生理生态特性的影响ꎮ 结果表明:随着 控水时间的延长ꎬ水分胁迫的程度不断加剧ꎬ东兴金花茶叶片净光合速率(Pn)、气孔导度(Gs )、蒸腾速率 (Tr )呈现显著下降趋势ꎻ胞间CO2浓度(Ci )呈现先低后高的变化趋势ꎬ水分利用效率(WUE)呈现先高后低 的变化趋势ꎮ 土壤含水率和叶片相对含水量均呈现不断下降的趋势ꎬ丙二醛呈现先降后升的变化趋势ꎻ东 兴金花茶幼苗的荧光参数Fv / Fm和Fv / Fo呈现先增加后不断下降趋势ꎬ分别从0.806 下降至0.754 和4.17 下 降至 3.08 ꎬ表明水分胁迫降低了PS Ⅱ原初光能转化效率ꎬ光合作用原初反应过程受到抑制ꎮ 基于水分胁迫 的生理生态指标和叶片生物性状的变化表明ꎬ控水时间在 4d 情况下东兴金花茶可以提高自身水分利用效 率来抵抗干旱ꎬ说明东兴金花茶幼苗对水分胁迫具有一定的适应性和响应机制ꎮ 控水8~12dꎬ东兴金花茶 的光合指标下降显著ꎬ土壤含水率下降至14.157％~15.065％ꎬ其叶片萎蔫、打卷ꎬ低于此水平东兴金花茶幼 苗会因过度干旱而死亡ꎬ表明东兴金花茶幼苗对水分胁迫的耐受极限土壤含水率为14.157％ ~ 15.065％ꎮ 研究结果有助于营建适宜的环境以保证东兴金花茶的正常生长和繁殖ꎬ对东兴金花茶迁地保护、引种培育 和回归自然具有重要的科学指导意义ꎮ [ABSTRACT FROM AUTHOR] |
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Academic Search Index |