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Trihybrid Crosses02:27

Trihybrid Crosses

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Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...
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Cytological Observation and RNA-Seq Analyses Reveal miR9564 and Its Target Associated with Pollen Sterility in

Zijun Lu1,2,3,4, Weicong Huang1,3,4, Lianjun Zhu1,3,4

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Summary

MicroRNAs regulate autotetraploid rice fertility. Specific microRNAs (miRNAs) and their target gene ARPS were identified as key factors in pollen sterility, impacting seed set and fertility in tetraploid rice.

Keywords:
autotetraploidmeiosismiRNApollen sterilitypolyploid rice

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Area of Science:

  • Plant genetics and breeding
  • Molecular biology
  • Reproductive biology

Background:

  • Autotetraploid rice offers advantages like genomic buffer capacity and heterosis.
  • MicroRNAs (miRNAs) are critical in fertility regulation, but their roles in tetraploid rice are not well understood.
  • Sterility in autotetraploid rice impacts its agricultural potential.

Purpose of the Study:

  • To investigate the cytological features and molecular factors, particularly miRNAs, associated with autotetraploid rice sterility.
  • To identify specific miRNA-target pairs involved in pollen development and fertility.
  • To elucidate the regulatory mechanisms underlying sterility in tetraploid rice lines.

Main Methods:

  • Comparative analysis of fertile (H1, HF) and sterile (LF) tetraploid rice lines.
  • RNA sequencing (RNA-seq) to identify differentially expressed miRNAs and their targets.
  • Quantitative real-time PCR (qRT-PCR) to validate miRNA and target gene expression.
  • Haplotype analysis and Dual-GFP assays to confirm gene regulation.
  • Over-expression studies to assess the impact of target genes on fertility.

Main Results:

  • Sterile LF lines exhibited abnormal meiosis, leading to reduced pollen fertility and seed set.
  • Thirty miRNA-candidate target pairs were identified, showing differential expression between fertile and sterile lines.
  • miR9564, miR528, and miR27874 were highly expressed in fertile anthers, while their targets (ARPS, M2T, OsRPC53) showed opposite expression.
  • ARPS expression correlated with specific MIR9564 haplotypes and was inhibited by miR9564.
  • Over-expression of ARPS significantly reduced seed setting rate and pollen fertility in neo-tetraploid rice.

Conclusions:

  • Specific miRNAs, notably miR9564, and their target ARPS play critical roles in autotetraploid rice pollen sterility.
  • Dysregulation of these miRNA-target interactions disrupts meiosis and impacts fertility.
  • This study provides molecular insights into polyploid rice fertility regulation, essential for breeding applications.