Subjects: Biology >> Botany >> Applied botany submitted time 2024-02-07 Cooperative journals: 《广西植物》
Abstract： In order to investigate study the influence of microbial agent Bacillus natto on the ability of Dicranopteris pedata to tolerate high temperature stress, this study determined the physiological indexes of photosynthesis and resistance to high temperature of annual D. pedata under different temperatures and fertilizers treatments. The results showed that: (1) both temperature and fertilizer could significantly affect the photosynthesis and high temperature resistance physiology of D. pedata (P＜0.05). (2) The net photosynthetic rate, transpiration rate, stomatal conductance, and chlorophyll content of D. pedata leaves were significantly reduced (P ＜0.05) when the temperature was increased to 45℃. The inhibition of photosynthetic physiology of D. pedata by high-temperature stress was an non-stomatal limiting. To defend the high temperature stress, the superoxide dismutase, peroxidase activity, proline, malondialdehyde content, and relative conductivity of D. pedata were increased significantly (P ＜ 0.05). (3) Compared with the control group and the organic fertilizer group, the fertilizer with microbial agent audition significantly increased the net photosynthetic rate, transpiration rate, stomatal conductance, chlorophyll content, and the activities of peroxide dismutase and catalase in leaves of D. pedata, and decreased the intercellular CO2 concentration, malondialdehyde content and the relative electrical conductivity of D. pedata leaves (P < 0.05). (4) The evaluation method combining principal component analysis and membership function method was used to evaluate the high temperature resistance of D. pedata. It was found that the D. pedata scored higher in resistance to high temperature under fertilizer-added origin manure application. Overall, D. pedata has a certain degree of resistance to high temperature, and can selectively induce stress resistance physiology to adapt the high temperatures environment according to different stress environments. The Bacillus natto can alleviate the photosynthesis inhibition of D. pedata by high temperature stress, induce the increase of antioxidant enzyme activities to alleviate cell damage, reduce the pressure of osmoregulation, and effectively improved the resistance of D. pedata induced by high temperature stress. This study provide a reference for the ecological restoration and soil and water conservation in the southern red soil erosion area and similar areas.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-05-27 Cooperative journals: 《广西植物》
Abstract： Plant functional traits can reflect response strategies of plants to environmental changes. In this study, we used a one-way ANOVA and RDA to compare the differences in leaf functional characters of Dicranopteris dichotoma in three micro-topographies (ridge, slope and valley of the ephemeral gully) and to analyze the response and adaptation strategy of D. dichotoma to shallow trench micro-topography. Our results were as follows: (1) The overall variation degree of leaf functional characters of D. dichotoma was between 0.048 and 0.472. Both leaf thickness and leaf area were showed at the order of valley > slope > ridge(P<0.05). The leaf N content at the slope was significantly higher than that at the ridge and valley. The leaf P content was significantly lower at the ridge than at the slope and valley. There was no significant difference in specific leaf area and leaf C content among three micro-topographies. (2) D.dichotoma at the ridge reduced water loss to protecte itself by reducing leaf area. D. dichotoma at the slope increased the photosynthetic rate of leaves to promote growth by increasing the N content of leaves. D. dichotoma at the valley improved light capture ability to promote growth by increasing the leaf area. The above results showed that due to the differences of soil nutrients, temperature and humidity conditions, D. dichotoma can achieve better adaption to the environment by adjusting nutrient content and changing leaf morphology.
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