Diurnal transcriptome dynamics reveal the photoperiod response of Pyrus

Author:

Liu Zhe12,Liu Weijuan1,Wang Zhangqing1,Qi Kaijie1,Xie Zhihua1,Zhang Shaoling1ORCID,Wu Juyou1ORCID,Wang Peng1ORCID

Affiliation:

1. Sanya Institute of Nanjing Agricultural University, State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, College of Horticulture Nanjing Agricultural University 210095 Nanjing China

2. Department of Pharmacy Changzhi Medical College Changzhi 046000 China

Abstract

AbstractPhotoperiod provides a key environmental signal that controls plant growth. Plants have evolved an integrated mechanism for sensing photoperiods with internal clocks to orchestrate physiological events. This mechanism has been identified to enable timely plant growth and improve fitness. Although the components and pathways underlying photoperiod regulation have been described in many species, diurnal patterns of gene expression at the genome‐wide level under different photoperiods are rarely reported in perennial fruit trees. To explore the global gene expression in response to photoperiod, pear plants were cultured under long‐day (LD) and short‐day (SD) conditions. A time‐series transcriptomic study was implemented using LD and SD samples collected at 4 h intervals over 2 days. We identified 13,677 rhythmic genes, of which 7639 were identified under LD and 10,557 under SD conditions. Additionally, 4674 genes were differentially expressed in response to photoperiod change. We also characterized the candidate homologs of clock‐associated genes in pear. Clock genes were involved in the regulation of many processes throughout the day, including photosynthesis, stress response, hormone dynamics, and secondary metabolism. Strikingly, genes within photosynthesis‐related pathways were enriched in both the rhythmic and differential expression analyses. Several key candidate genes were identified to be associated with regulating photosynthesis and improving productivity under different photoperiods. The results suggest that temporal variation in gene expression should not be ignored in pear gene function research. Overall, our work expands the understanding of photoperiod regulation of plant growth, particularly by extending the research to non‐model trees.

Funder

Earmarked Fund for China Agriculture Research System

Jiangsu Agricultural Science and Technology Innovation Fund

National Key Research and Development Program of China

Publisher

Wiley

Subject

Cell Biology,Plant Science,Genetics,General Medicine,Physiology

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