查看更多>>摘要：Although most ABC proteins are transporters, proteins of the ABC F subfamily lack the required transmembrane domains and, consequently, their functions are poorly understood. Here, we report that the F subfamily member general control non-repressible 20 (GCN20) mediates ABA and ROS accumulation in plants during salt stress. We demonstrate that salt conditions induce the expression of GCN20. The gcn20-1 mutant with more ABA accumulation is more sensitive to high salinity than the wild type in terms of decreased seed germination and fresh weight, and decreasing ABA accumulation can rescue reduced salt tolerance of the mutant, revealing the involvement of ABA in GCN20-mediated salt stress response. Consistently, salt stress promotes a number of stress-related and ABA signal-responsive genes expression in the gcn20-1 plants. In addition, the gcn20-1 plants have less CAT and SOD activity, and thus more ROS than wild-type plants when subjected to salt stress. These findings display that GCN20 is closely involved in the stress response caused by high salinity through modulation of ABA accumulation.
查看更多>>摘要：Nanoplastics are widespread in the environment, and their increased persistence is an indisputable and severe threat. The impacts of these nanoplastic particles on the soil system and terrestrial plant growth, as well as how the EPS secreted by soil microbes would influence their toxic effects remain largely unexplored. This study focuses on the toxic effects of polystyrene nanoplastics (PSNPs) of various surface charges (plain, aminated, and carboxylated) and concentrations (12.5, 25, and 50 mg/l) in Allium cepa and illustrates the effects of eco-corona formation in reducing the toxic impact. The endpoints evaluated included cytotoxicity, oxidative stress (total ROS, superoxide, hydroxyl radical generation and lipid peroxidation), and antioxidant enzyme activity (catalase and guaiacol peroxidase). Among the various surface charges, aminated PSNPs showed the highest toxicity for all the three concentrations tested. The results showed a concentration reliant increase in the levels of cell death, oxidative stress generation, and antioxidant enzyme activity for pristine PSNPs irrespective of their surface charges. Upon aging in the EPS medium a decrease in the toxic effects was noted for all the indicators. This could be a result of the agglomeration due to eco corona formation over the PSNPs in the EPS medium. The TEM images and MHD analysis for both pristine and the coronated PSNPs confirmed the agglomeration.
Prisca, MeyerMaarten, VerlentJan, Van DoorsselaereBart, Nicolai...
14页
查看更多>>摘要：ABS T R A C T Indoor vertical farming is currently a breakthrough horticultural production system. However, for fruit bearing crops such as strawberry, a major challenge is optimizing light spectral composition to control flowering. We have shown that it is possible to stimulate flowering and fruit development with different light treatments in the day-neutral strawberry accessions Fragaria vesca 'Yellow Wonder' YW5AF7 and 'Hawaii-4'. We used blue (449 nm) and far-red (740 nm) light in a background of sunlight-mimicking photosynthetic active radiation (PAR) under both long-and short-day photoperiods. Flower induction was most successful when blue light was given during the night and far-red light was given for 24 h. These light treatments overruled the photoperiodic control of flowering. Both light treatments boosted flowering, leading to a higher fruit yield, with minor effects on vegetative plant growth. We also evaluated the role of FvCO and FvFT1 using expression analysis and RNAi lines, and revealed that both blue and far-red light treatments trigger flowering in part through the conserved FvCO and FvFT1 cascade. Blue light operates through FvFT1, partially independently of FvCO, while far-red light operates independently of FvCO. Furthermore, using transcriptional reporter lines of FvFT1, we found that FvFT1 is ontogenetically and tissue-specifically regulated, being exclusively expressed in the veins of older leaves, and induced predominantly by blue and far-red light.
NSTL
Elsevier