Subjects: Biology >> Botany >> Applied botany submitted time 2023-12-24 Cooperative journals: 《广西植物》
Abstract： Exploring the stoichiometric characteristics of understory plants’ leaves and soil in different forest types in Maoershan can reveal the adaptation strategies of understory plants in Maoershan, and provide data support for forest management. In this paper, coniferous and broad-leaved mixed forest (ZK), evergreen broad-leaved secondary forest (CLC) and evergreen broad-leaved forest (CL) in Maoershan were selected as three forest types, the leaf stoichiometry of main plants in herb layer and shrub layer, and the soil stoichiometry under three forest types were measured and analyzed. The results were as follows: (1) There was no significant difference in leaf C and N contents between herb layer and shrub layer, but P and K contents in herb layer were extremely significantly higher than that in shrub layer, and N∶P was significantly lower than that in shrub layer. Plants in herb layer was more likely to be restricted by N, plants in shrub layer was more likely to be restricted by P and the utilization efficiency of N and P were higher. There was no significant difference in leaf stoichiometry of plants in shrub layer among different forest types, but there were significant differences in leaf N content, C∶N, C∶P of plants in herb layer among different forest types. Plants in herb layer of coniferous and broad-leaved mixed forest had higher nutrient use efficiency. (2) The soil C and N contents of the three forest types showed that CL > CLC > ZK, and there were extremely significant differences among the three forest types. The soil P content of coniferous and broad-leaved mixed forest was the highest, while that of C∶P and N ∶ P was the lowest. (3) Soil in coniferous and broad-leaved mixed forest significantly affected some leaf stoichiometry of plants in herb layer and shrub layer, while the other two forest types had no significant effect on underforest plants. To sum up, there are significant or extremely significant differences in soil stoichiometry among different forest types in Maoershan. The nutrient requirements and environmental adaptation strategies of plants in herb layer and shrub layer are different. The soil of coniferous and broad-leaved mixed forest has a strong influence on the leaf stoichiometry of understory plants, and the soil with low decomposition efficiency of organic matter in this forest type, and the soil is limited by N due to the low decomposition efficiency of organic matter, so the management of N in the mixed forest should be strengthened.
Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-26 Cooperative journals: 《广西植物》
Abstract： Camellia perpetua is the only rare and endangered plant in the genus Camellia that blooms almost all year round. It provides reference for people to know the flower bud differentiation process and the changes of endogenous hormones in leaves at different flower development period and annual growth cycles, as well as clarify the continuous flowering mechanism of this species. In this study, the process of C. perpetua bud differentiation was observed by paraffin sections. The contents of abscisic acid (ABA), indole-3-acetic acid (IAA), gibberellin (GA3) and zeatin nucleoside (ZR) in leaves at different flower development period and in leaves with flower bud and leaves without flower bud in annual growth cycle were determined by enzyme-linked immunosorbent assay (ELISA). The results were as follows: (1) The flower bud differentiation sequence of C. perpetua was from the outside to the inside, and it was divided into 6 period, which lasted 35 days in total, from the bud differentiation to flowering about 2 months. (2) The contents of ABA and GA3 and the ratios of GA3/ABA and (IAA + GA3) /ZR were higher in flower bud morphological differentiation period, while the content of IAA and ZR and the ratios of IAA/ABA and ZR/ABA were lower. (3)The contents of ABA, IAA and ZR in the leaves with flower bud were higher than those in the leaves without flower bud. The IAA/ZR and (IAA + GA3) /ZR ratios were lower than those of the leaves without flower bud. In conclusion, the flower bud differentiation to flowering time of C. perpetua is shorter. High levels of ABA and GA3 and low levels of IAA and ZR are beneficial to flower bud differentiation. Higher levels of ABA, IAA and ZR are beneficial to flower bud development.
Subjects: Biology >> Botany submitted time 2022-12-29 Cooperative journals: 《广西植物》
Abstract：
In order to clarify the nutritional value characteristics and development direction of different parts of Malania oleifera, essential nutrients, amino acids and minerals in the kernel, peel, leaf, branch bark and bark of M. oleifera were determined by using the analysis method of conventional food nutrients and the nutritional value of each portion of the amino acids was evaluated. The results were as follow: (1) In terms of essential nutrients, except for carbohydrates, there were extremely significant differences in the contents of the remaining seven basic nutrients among five parts (P<0.01). The ash content of peel was highest than other parts, which was 5.7 g/100 g. The contents of crude fat and protein in kernel were highest than other parts, which were 36.0 and 14.0 g/100 g respectively. The content of Vitamin C in leaf was highest than other parts, which was 33.9 mg/100 g. The content of crude fiber in branch bark was highest than other parts, which was 40.5 g/100 g. The content of carbohydrate in bark was highest than other parts, which was 78.6 g/100 g. Volatile oil was detected only in kernel and leaf, with the content of 0.26 and 0.15 mL/100 g respectively. (2) A total of 16 amino acids were detected in the five parts of M. oleifera, including 7 essential amino acids. The total amount of amino acids and essential amino acids of kernel were much higher than those of other parts. In terms of amino acid nutritional value, the nutritional value of kernel and peel were higher than other parts, followed by leaf, bark and bark. And the essential amino acid ratio coefficient score ( SRC ) was 62.98, 59.40, 57.31, 52.25, 48.17, respectively. (3) The highest content of major elements in kernel, peel and leaf was K, the highest content of major elements in branch bark and bark was Ca, and the content of Na in five parts of M. oleifera was lowest. Among the macro-minerals, the contents of P and Mg in kernel were significantly higher than those in other parts (P<0.05). The contents of K and Na in peel were significantly higher than those in other parts (P<0.05). And the results also showed high levels of K/Na ratios at all parts. In terms of trace elements, the content of Mn and Fe in five parts of M. oleifera were higher than others. The content of Mn in kernel was the highest, and the content of Fe in branch bark was the highest. The total contents of Mn and Fe in kernel and leaf were higher than other parts. Comprehensive results show that the kernel has the highest nutritional value and each part has its own characteristics and advantages. Different parts can be effectively and accurately developed and utilized according to different value characteristics.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-07-05 Cooperative journals: 《广西植物》
Abstract： The investigation of the calcium speciation characteristics in leaf under different habitats can help to understand deeply the adaptation mechanisms of golden Camellia species to soil calcium and provide a reference for the development of their conservation measures. In this study, 10 species of golden Camellia from calcareous soil habitats and 4 from acidic soil habitats were employed. The calcium content (Soil-Ca) and pH (Soil-pH) of habitat soil, and the content of calcium nitrate and calcium hloride (AIC-Ca), water soluble calcium (H2O-Ca), calcium pectate (NaCl-Ca), calcium phosphate and calcium carbonate (HAC-Ca), calcium oxalate (HCl-Ca), sili-cate calcium (Res-Ca), and total calcium (Tot-Ca) of leaves were measured. The results were as follows: (1) the Soil-Ca and Soil-pH of calcareous soils were extremely significantly (P<0.01) higher than those of acidic soils. (2) The leaf calcium speciation of golden Camellia species from calcareous soil habitats was primarily HCl-Ca (41.17%), while species from acidic soil habitats was primarily NaCl-Ca (43.10%), and all calcium speciation and total calcium content in leaves of species from calcareous soil were extremely significantly (P<0.01) higher than that from acidic soil except for AIC-Ca and NaCl-Ca. (3) Correlation analysis showed that most of the content of calcium speciation in leaves was extremely significantly (P<0.01) and positively correlated with Soil-Ca and Soil-pH, indicating that soil environment had an important influence on the leaf calcium speciation characteristics of golden Camellia species. (4) According to ANOVA, the content of each leaf calcium speciation was extremely significant (P<0.01) difference among the species in golden Camellia revealing that the calcium speciation char-acteristics have a considerable variation during the species differentiation. (5) Cluster analysis based on calcium speciation characteristics showed that the 14 species of golden Camellia could be grouped into three categories. In summary, the differences in leaf calcium speciation of plants of golden Camellia species in different habitats may be the consequence of a combination of soil environmental and genetic factors.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-03-30 Cooperative journals: 《广西植物》
Abstract： Keteleeria calcarea is a precious tree species in the mid-subtropical karst area, this species has a narrow distribution range and very few seedlings in wild populations, which severely limits the natural renewal of the population. In order to explore the causes for the endangerment of this species and provide reference for its protection and utilization, the cones and seeds morphological characteris-tics of K. calcarea were measured, and the effects of temperatures, light conditions, soil water con-tents, substrates, storage temperatures and time, and different geographical provenances on seed ger-mination were studied. The results were as follows: (1) The average seed setting rate of K. calcarea cone was 7.45%±6.54%, the seed wing length was 2.27±0.32 cm, the average seed length was 1.55±0.15 cm (excluding seed wing), the average width was 0.62±0.05 cm, the average thickness was 0.46±0.04 cm, and the average 1 000-seed weight was 214.81±14.76 g, the average water content of dried seeds was 15.28%±1.66%. (2) The optimum temperature for seed germination was 25 ℃, and the germination rate decreased significantly at 20 ℃ and 30 ℃ (P<0.05); Seed germination did not need light, but the germination rate under periodic light was significantly higher than that under con-tinuous light and continuous darkness (P<0.05); The seeds could germinate under the conditions of 10%-30% soil water contents, and could withstand a certain degree of drought; Peat soil and perlite with loose texture and good air permeability were suitable for germination; The seeds were not re-sistant to storage and should be sown in time after collection; The seed germination rate of Sanjiang population in Gongcheng County was the highest among the three geographical provenances. The seed setting rate of K. calcarea cone was low, the seed germination was strict with temperature, and the seed was easy to lose vigor, which may be an important reason for its endangerment.
Hits
Hits
Downloads
Comment