Identification and characterization of miRNAs during flag leaf senescence in rice by high-throughput sequencing
- 24 Downloads
Flag leaf is the last leaf to senesce and its life span plays a critical role in determining grain quality and yield in rice. Little is known about the molecular changes that occur and their regulation in time-dependent manner during flag leaf senescence in rice. Several studies have explored different aspects of miRNA functions in plant development; however, a diminutive account is available about their role in flag leaf senescence. With an aim to unravel the role of miRNAs in ageing of flag leaf in rice, four small RNA libraries were prepared from three stages of senescence and sequenced by Illumina deep sequencing technology. Thirty-eight known and 494 novel miRNAs were identified in the senescing flag leaves. Digital expression analysis revealed that 21 known and 116 novel miRNAs were differentially expressed during senescence. Family member(s) of miR156, miR159, miR160, miR164, miR169, miR171, miR393, miR396, miR535, miR827, miR1428, miR1432 and miR1861 were differentially expressed in at least one stage of flag leaf senescence. The present study has generated a repository of senescence-related miRNAs that can be utilized to contemplate molecular approaches for manipulating the timing of flag leaf senescence in rice and other related crops.
KeywordsRice Flag leaf senescence Small RNA miRNAs High throughput sequencing qPCR
JMS and CVK are thankful for research fellowships from University Grants Commission (UGC), India. R&D grants from DBT, DST-PURSE and University of Delhi are acknowledged. We thank Gopal Joshi for helping with submission of small RNA sequencing data to SRA database. Deep sequencing was carried out by DBT-funded High-Throughput Sequencing Facility at University of Delhi South Campus, New Delhi, India.
- Kam, J., Gresshoff, P., Shorter, R., & Xue, G. P. (2007). Expression analysis of RING zinc finger genes from Triticum aestivum and identification of TaRZF70 that contains four RING-H2 domains and differentially responds to water deficit between leaf and root. Plant Science, 173, 650–659.CrossRefGoogle Scholar
- Kim, J., Chang, C., & Tucker, M. L. (2015). To grow old: Regulatory role of ethylene and jasmonic acid in senescence. Frontiers in Plant Science, 6, 1–7.Google Scholar
- Xiao, D., Cui, Y., Xu, F., Xu, X., Gao, G., Wang, Y., et al. (2015). SENESCENCE-SUPPRESSED PROTEIN PHOSPHATASE directly interacts with the cytoplasmic domain of SENESCENCE-ASSOCIATED RECEPTOR-LIKE KINASE and negatively regulates leaf senescence in Arabidopsis. Plant Physiology, 169, 1275–1291.CrossRefGoogle Scholar
- Zeng, S., Liu, Y., Pan, L., Hayward, A., & Wang, Y. (2015). Identification and characterization of miRNAs in ripening fruit of Lycium barbarum L. using high-throughput sequencing. Frontiers in Plant Science, 6, 1–15.Google Scholar