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以广西木莲为试材,采用不同的干旱强度,正常供水CK(土壤水分含量为最大田间持水量的80%,下同),轻度干旱胁迫P1(65%)、中度干旱胁迫P2(35%)、重度干旱胁迫P3(15%)4种处理方式对广西木莲抗旱能力进行研究,对广西木莲叶片光合指标和叶绿素荧光值进行分析。结果表明:随着干旱强度的增强,广西木莲的光合作用能力不断降低,Pmax、Tr、Gs等光合指标不断下降。但Ci在P2处理条件下达到最低,植物细胞获取CO2能力逐渐稳定,表现出了广西木莲较弱的抗旱能力;在对叶绿素荧光日变化值研究发现,Fv/Fm、ΦPSII具有随着光照日变化会自我恢复到一个稳定值,表明了广西木莲在逆境条件下能够维持植物体内一定的光合作用,保证植物体自身的能量获取。
The results showed that CK (normal soil water content was 80% of maximum field capacity, the same below), mild drought stress P1 (65%), moderate drought stress P2 35%), and severe drought stress P3 (15%). The drought resistance of M. officinale was studied, and the photosynthetic indexes and chlorophyll fluorescence of M. officinale were analyzed. The results showed that with the increase of drought intensity, the photosynthesis ability of M. officinale decreased and the photosynthetic indexes such as Pmax, Tr and Gs decreased continuously. However, Ci was the lowest under the condition of P2 treatment, and the ability of plant cells to obtain CO2 was gradually stabilized, showing a weak drought resistance ability of M. magnoliae. In the study of diurnal variation of chlorophyll fluorescence, Fv / Fm and ΦPSII had the following characteristics: Changes will be self-recovery to a stable value, indicating that under dry conditions in Guangxi Manglie plant can maintain a certain degree of photosynthesis, to ensure that the plant’s own energy access.