农学最新文献

Vegetable oil production from oil palm (Elaeis guineensis Jacq.) is an important industry due to the rising demand every year. The somatic embryogenesis culture can propagate oil palm duplicate as parent plant, which can be selected as breeding material to produce new planting germplasm with high production or disease resistance. This study aims to evaluate the genotypic effect of somatic embryogenesis, while immature leaflets were employed as explants. The culture used embryo induction medium based on Murashige and Skoog (MS) modifications that contained 5 ​mg/L Naphthalene Acetic acid (NAA) and 0.5 ​mg/L Benzyl Amino Purine (BAP). The genotypic effect was statistically significant in the percentage of callus induction, producing somatic embryos, and germination embryos. In this study, we successfully cloned thirteen oil palm genotypes (GE-02, GE-03, GE-06, GE-07, GE-09, GE-23, GE-24, GE-27, GE-28, GE-32, GE-33, GE-34, and GE-35), with the highest number of somatic embryos formed on GE-27 with a percentage of 70.1%. The cloning was successful in accelerating the propagation of oil palm for materials breeding programs to create new varieties with high production and disease resistance. It is necessary to observation the performance of these clones in the field in terms of mantle flower appearance.

Selenium (Se)-enriched Brassica napus L. is a valuable organic Se supplement. In this study, the fermentation broth enriched with organic Se (FFS) was prepared using Lactobacillus plantarum to ferment the substrate of Se-enriched Brassica napus L. Significant increases were observed after fermentation in total sugars, reducing sugars, soluble proteins, total phenolic content (TPC), and total flavonoid content (TFC). The organic Se was retained at a concentration of 54.75 ​mg/g in the freeze-dried sample. Principal component analysis and cluster analysis showed good separation between the FFS and unfermented (FS) groups. Fragrant 2-ethyloxetane had the highest content among all volatiles, while sinapine had the highest content among all phenolic compounds. The fermentation process showed remarkable improvement in the abundance and concentration of volatile compounds and phenolic contents, making FFS exhibit strong antioxidant activity and inhibitory capacity against α-glucosidase activity. The bioaccessibility of phenolic compounds was significantly greater in FFS compared to FS. ADMET analysis revealed that the majority of phenolic compounds contained in FFS did not exhibit mutagenicity toxicity, hepatotoxicity, skin sensitization, or blood-brain barrier penetration, indicating a favorable level of biosafety. Overall, our study provides a new insight into the further utilization of Se-enriched Brassica napus L. in foods.

Among plants, there is considerable variation in lifespan: annuals live less than one year, whereas perennials live for several years, with the longest-living perennial having survived 43,600 years. As proposed by the Disposable Soma Theory, this lifespan variation among plants likely reflects differential investment of limited energy and nutrient resources, with perennials investing more energy and nutrients into biomolecular maintenance compared to annuals in order to ensure persistence over multiple seasons. Such differential investment may be particularly important during periods of exogenous stress, which are known to accelerate biomolecular damage. The present study evaluated this hypothesis using annual and perennial flax (Linum L.) subjected to two exogenous stressors—increased oxidative stress (i.e., foliar H₂O₂ spraying) and complete prolonged darkness. As chlorophyll has been shown to exhibit degradation in response to changes in environmental conditions, we utilized changes in chlorophyll levels during and after periods of exogenous stress to evaluate our hypotheses. We predicted that i) perennials would exhibit a slower rate of chlorophyll degradation during exposure to exogenous stressors compared to annuals, and ii) perennials would exhibit a faster rate of chlorophyll resynthesis following such exposure compared to annuals. Chlorophyll levels before, during, and after exposure to both exogenous stressors were measured in two separate trails, once using image colour analysis and once using spectrophotometry. While chlorophyll degradation rates in response to oxidative stress did not differ between annuals and perennials, contrary to our predictions, chlorophyll resynthesis rates following such exposure were significantly higher in perennials, as predicted. When plants were subjected to complete prolonged darkness, chlorophyll degradation rates were significantly lower in perennials than annuals, as predicted; however, when plants were subsequently reintroduced to natural photoperiod, chlorophyll resynthesis rates did not consistently differ between annuals and perennials, though they tended to be higher in the latter, as predicted. Overall, our study illuminates that evolutionary transitions between life history strategies in plants have been accompanied by physiological modifications to chlorophyll dynamics that permit perennial species to better maintain chlorophyll levels—and thus photosynthetic energy acquisition—in the face of exogenous stressors, which likely underlies their capacity to survive for multiple growing seasons. Future studies should explore whether other key biomolecules (e.g., proteins, DNA) are also better maintained in perennial plants, especially in the face of exogenous stress.