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为探讨地被菊‘火焰’在干旱胁迫下的响应机制,采用盆栽控水法,研究不同干旱胁迫强度下地被菊‘火焰’生长、生理生化和光合生理的变化。结果表明:(1)干旱胁迫抑制‘火焰’生长发育,其中,中度和重度胁迫对植株生长影响较大。(2)随着干旱胁迫强度加剧,叶片相对含水量(LRWC)降低,叶片脯氨酸(Pro)、可溶性糖(Ss)和可溶性蛋白(Sp)含量增加,丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性和叶绿素(Chl)含量升高。(3)光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)随干旱胁迫程度加大而降低,胞间CO2浓度(Ci)呈先降后升趋势。结果表明土壤含水量为(13.33±0.2)%时对‘火焰’生长影响较小;土壤含水量为(10±0.2)%时,植株生长缓慢;土壤含水量为(6.66±0.2)%时‘火焰’生长明显受到抑制。
In order to investigate the response mechanism of Chrysanthemum ’Flame’ under drought stress, the pot experiment was used to study the changes of ’Flame’ growth, physiology, biochemistry and photosynthesis under different drought stress intensities. The results showed that: (1) Drought stress inhibited the growth of ’Flame’, among which, moderate and severe stresses had a great effect on plant growth. (2) With the intensification of drought stress, the leaf relative water content (LRWC) decreased, the content of proline (Pro), soluble sugar (Ss) and soluble protein (Sp) increased, the content of malondialdehyde (MDA) Oxide dismutase (SOD) activity and chlorophyll (Chl) content increased. (3) The photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) decreased with the increase of drought stress and the intercellular CO2 concentration (Ci) decreased first and then increased. The results showed that when the soil water content was (13.33 ± 0.2)%, the growth of ’Flame’ was little affected; when the soil water content was (10 ± 0.2)%, the plant grew slowly; when the soil water content was (6.66 ± 0.2)%, Flame ’growth was significantly inhibited.