The 24-nucleotides (nt) phased secondary small interfering RNA (phasiRNA) is a unique class of plant small RNAs abundantly expressed in monocot anthers at early meiosis. Previously, 44 intergenic regions were identified as the loci for longer precursor RNAs of 24-nt phasiRNAs (24- PHASs) in the rice genome. However, the regulatory mechanism that determines spatiotemporal expression of these RNAs has remained elusive. ETERNAL TAPETUM1 (EAT1) is a basic-helix-loop-helix (bHLH) transcription factor indispensable for induction of programmed cell death (PCD) in postmeiotic anther tapetum, the somatic nursery for pollen production. In this study, EAT1-dependent non-cell-autonomous regulation of male meiosis was evidenced from microscopic observation of the eat1 mutant, in which meiosis with aberrantly decondensed chromosomes was retarded but accomplished somehow, eventually resulting in abortive microspores due to an aberrant tapetal PCD. EAT1 protein accumulated in tapetal-cell nuclei at early meiosis and postmeiotic microspore stages. Meiotic EAT1 promoted transcription of 24- PHAS RNAs at 101 loci, and importantly, also activated DICER-LIKE5 ( DCL5, previous DCL3b in rice) mRNA transcription that is required for processing of double-stranded 24- PHASs into 24-nt lengths. From the results of the chromatin-immunoprecipitation and transient expression analyses, another tapetum-expressing bHLH protein, TDR INTERACTING PROTEIN2 (TIP2), was suggested to be involved in meiotic small-RNA biogenesis. The transient assay also demonstrated that UNDEVELOPED TAPETUM1 (UDT1)/bHLH164 is a potential interacting partner of both EAT1 and TIP2 during early meiosis. This study indicates that EAT1 is one of key regulators triggering meiotic phasiRNA biogenesis in anther tapetum, and that other bHLH proteins, TIP2 and UDT1, also play some important roles in this process. Spatiotemporal expression control of these bHLH proteins is a clue to orchestrate precise meiosis progression and subsequent pollen production non-cell-autonomously.
Meiotic crossover formation shuffles homologous genes between parental genomes, and enables transmission of new gene sets to the offspring. Frequency and positions of crossovers are determined by numerous genetic and epigenetic factors, and low nucleosome-density regions are associated with crossover hot spots in yeasts and Arabidopsis. The epigenetic chromosome landscape is shaped by unevenly distributed modifications of nucleosome components, histones and DNAs. Recently, we found that MEL1 (ARGONAUTE5) promotes large-scale remodeling of meiotic chromosomes with dramatic increases of histone H3 lysine 9 dimethylation, and that loss of MEL1 resulted in early meiotic arrest with few crossovers present. In rice anthers, MEL1-associating small interfering RNAs (masiRNAs) were composed of large amounts of premeiotic 21-nt phasiRNAs, plus low levels of both 24-nt repeat-associated siRNA and meiotic 24-nt phasiRNAs. Production of 24-nt phasiRNA during the meiotic stage was largely EAT1-dependent. Collectively, our findings suggest a possibility that unknown small RNA-mediated signaling regulates male meiosis non-cell-autonomously, probably a downstream output involves large-scale chromosome remodeling promoted by Argonaute proteins, while a possibility of EAT1-dependent, but small RNA-independent signaling cannot be excluded. In any cases, the studies on MEL1 and tapetal bHLH proteins will be a clue to reveal small RNA-mediated processes determining meiotic epigenetic landscape.