Project description:Pomegranate (Punica granatum L.) is sensitive to drought stress, which largely affects its transplantation survival rate, fruit yield and quality. Abscisic acid (ABA) treatment can reduce the drought-induced adverse impacts on plants. However, no studies have ever applied ABA as an exogenous supply to alleviate the drought stress on pomegranates. In this study, we performed comparative transcriptome analysis between the ABA-treated and untreated pomegranates to reveal the ABA-induced mechanisms in response to drought-stress. Our results showed that exogenous ABA application substantially enhanced pomegranate drought resistance by strengthening metabolic pathways, such as BRs synthesis, peroxisome biogenesis, photosynthesis and hemicelluloses synthesis. Furthermore, treatments with different ABA concentrations may provoke different transcriptional responses and, once the concentration exceeds the optimal (60 μM), it might induce some potential adverse impacts on plant growth and stress resistance.
Project description:Dwarfed stature is a desired trait for modern orchard production systems. One effective strategy of dwarfing is exogenously applying plant growth retardants (PGRs) to plants. However, for many economic fruit trees, the current knowledge on the regulatory mechanisms underlying the dwarfing effect of PGRs were limited, which largely restricts their agricultural application. In this study, we exogenously applied three kinds of PGRs (paclobutrazol, B9 and mannitol) to the seedlings of pomegranate (Punica granatum L.) and performed comparative transcriptome analysis to elucidate the molecular features of PGR-induced dwarfing in pomegranates. Our results showed that all the three PGRs could significantly suppress auxin biosynthetic and metabolic processes, as well as auxin-mediated shoot development, which may be the main reason for the dwarfing. Besides, different PGRs were also found to induce dwarfing via specially mechanisms. Cellular response to strigolactone were downregulated by the application of paclobutrazol, while carbohydrate homeostasis and metabolism were specifically suppressed in conditions of either B9 or mannitol treatments. Furthermore, exogenous PGR application was supposed to causes adverse impacts on the normal physiological process of pomegranate seedlings, which may bring extra burden to stress adaptation of pomegranate plants. These novel findings unveiled the genetic basis underlying the dwarfing in pomegranates.
2022-02-13 | GSE195722 | GEO
Project description:Analysis of the complete mitochondrial genome of the pomegranate (Punica granatum)