Journal of Integrative Plant Biology最新文献

This Commentary examines a recent study that identified peroxisomal cinnamate: CoA ligases as key enzymes for salicylic acid biosynthesis, which promotes submerged germination by releasing the inhibition of rice germination by indole-acetic acid. This study thus provides important information for developing rice varieties suitable for direct seeding.

Bamboo shoots are globally recognized for their economic importance and are a delicious, valuable component of a healthy diet. Jiang et al. (pages 1087–1105) produced a highquality chromosomal genome assembly of the heterozygous allohexaploid bamboo Dendrocalamus brandisii. On the cover, the D. brandisii shoot is metaphorically depicted as a DNA double helix. This structure breaks through the soil, grows tall and strong, and supports the growing bamboo plant. This vivid imagery underscores the crucial role of high-quality genome sequences, along with comprehensive transcriptome and metabolome analyses in revealing the molecular reasons for the delicious taste of these bamboo shoots, which have a higher flavor, more sweet amino acids, lower lignin contents, and higher sugar contents compared with shoots from other bamboo species.

Phytohormones, epigenetic regulation and environmental factors regulate fruit ripening but their interplay during strawberry fruit ripening remains to be determined. In this study, bagged strawberry fruit exhibited delayed ripening compared with fruit grown in normal light, correlating with reduced abscisic acid (ABA) accumulation. Transcription of the key ABA catabolism gene, ABA 8′-hydroxylase FaCYP707A4, was induced in bagged fruit. With light exclusion whole genome DNA methylation levels were up-regulated, corresponding to a delayed ripening process, while DNA methylation levels in the promoter of FaCYP707A4 were suppressed, correlating with increases in transcript and decreased ABA content. Experiments indicated FaCRY1, a blue light receptor repressed in bagged fruit and FaAGO4, a key protein involved in RNA-directed DNA methylation, could bind to the promoter of FaCYP707A4. The interaction between FaCRY1 and FaAGO4, and an increased enrichment of FaAGO4 directed to the FaCYP707A4 promoter in fruit grown under light suggests FaCRY1 may influence FaAGO4 to modulate the DNA methylation status of the FaCYP707A4 promoter. Furthermore, transient overexpression of FaCRY1, or an increase in FaCRY1 transcription by blue light treatment, increases the methylation level of the FaCYP707A4 promoter, while transient RNA interference of FaCRY1 displayed opposite phenotypes. These findings reveal a mechanism by which DNA methylation influences ABA catabolism, and participates in light-mediated strawberry ripening.

The E3 ubiquitin ligase MdSINA11 targets the jasmonate ZIM domain protein MdJAZ2 for ubiquitination and degradation through the 26S proteasome pathway, thereby initiating jasmonate signaling and jasmonic acid-triggered anthocyanin biosynthesis in apple.

Heading date, grain number per spike, and grain weight are crucial traits affecting yield and adaptability in wheat. The transcription factor TaMYB72 is an important regulator of wheat grain yield and its knock-out mutants can be used as germplasm resources for wheat improvement.

Callose, a β-1,3-glucan plant cell wall polymer, regulates symplasmic channel size at plasmodesmata (PD) and plays a crucial role in a variety of plant processes. However, elucidating the molecular mechanism of PD callose homeostasis is limited. We screened and identified an Arabidopsis mutant plant with excessive callose deposition at PD and found that the mutated gene was α1-COP, a member of the coat protein I (COPI) coatomer complex. We report that loss of function of α1-COP elevates the callose accumulation at PD by affecting subcellular protein localization of callose degradation enzyme PdBG2. This process is linked to the functions of ERH1, an inositol phosphoryl ceramide synthase, and glucosylceramide synthase through physical interactions with the α1-COP protein. Additionally, the loss of function of α1-COP alters the subcellular localization of ERH1 and GCS proteins, resulting in a reduction of GlcCers and GlcHCers molecules, which are key sphingolipid (SL) species for lipid raft formation. Our findings suggest that α1-COP protein, together with SL modifiers controlling lipid raft compositions, regulates the subcellular localization of GPI-anchored PDBG2 proteins, and hence the callose turnover at PD and symplasmic movement of biomolecules. Our findings provide the first key clue to link the COPI-mediated intracellular trafficking pathway to the callose-mediated intercellular signaling pathway through PD.

Three Medicago truncatula LysM domain receptor kinases have redundant functions in nodulation, with multiple specificities mediating both entry and signaling responses and with distinct contributions to nodulation likely resulting from differing transcription patterns.