Validation of Reference Genes for Quantitative Real-Time PCR Normalization in Ananas comosus var. bracteatus During Chimeric Leaf Development and Response to Hormone Stimuli.

Meiqin Mao,Xi Li,Hao Hu,Xuzixing Zhou,Wei Yang,Jiawen Liu,Jiaheng Luo,Huiling Zhang,Yehua He,Yanbin Xue,Jun Ma,Lijun Feng

doi:10.3389/fgene.2021.716137

Meiqin Mao, Xi Li + Show 10 more

Open Access

https://doi.org/10.3389/fgene.2021.716137

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Abstract

Reverse transcription quantitative real-time PCR (RT-qPCR) is a common way to study gene regulation at the transcriptional level due to its sensibility and specificity, but it needs appropriate reference genes to normalize data. Ananas comosus var. bracteatus, with white-green chimeric leaves, is an important pantropical ornamental plant. Up to date, no reference genes have been evaluated in Ananas comosus var. bracteatus. In this work, we used five common statistics tools (geNorm, NormFinder, BestKeeper, ΔCt method, RefFinder) to evaluate 10 candidate reference genes. The results showed that Unigene.16454 and Unigene.16459 were the optimal reference genes for different tissues, Unigene.16454 and zinc finger ran-binding domain-containing protein 2 (ZRANB2) for chimeric leaf at different developmental stages, isocitrate dehydrogenase [NADP] (IDH) and triacylglycerol lipase SDP1-like (SDP) for seedlings under different hormone treatments. The comprehensive results showed IDH, pentatricopeptide repeat-containing protein (PPRC), Unigene.16454, and caffeoyl-CoA O methyltransferase 5-like (CCOAOMT) are the top-ranked stable genes across all the samples. The stability of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) was the least during all experiments. Furthermore, the reliability of recommended reference gene was validated by the detection of porphobilinogen deaminase (HEMC) expression levels in chimeric leaves. Overall, this study provides appropriate reference genes under three specific experimental conditions and will be useful for future research on spatial and temporal regulation of gene expression and multiple hormone regulation pathways in Ananas comosus var. bracteatus.

Highlights

Ananas comosus var. bracteatus is a monocotyledon from the Bromeliaceae family that originates from tropical and subtropical areas of South America (Baker and Collins, 1939; Duval et al, 1997)
Chimeric leaf development stages (S) were as follows: stage 1 (S1, no chlorophyll is visible on the leaf); stage 2 (S2, chlorophyll becomes visible on leaf center); stage 3 (S3, two thirds of the leaf are fully pigmented by chlorophyll) (Additional File 1: Supplementary Figure S1)
Gel electrophoresis and melting curve analysis showed that all primer pairs present a single band and a single peak (Figures 1,2), which validates the specificity of primers

Summary

Introduction

Ananas comosus var. bracteatus is a monocotyledon from the Bromeliaceae family that originates from tropical and subtropical areas of South America (Baker and Collins, 1939; Duval et al, 1997). Bracteatus is a monocotyledon from the Bromeliaceae family that originates from tropical and subtropical areas of South America (Baker and Collins, 1939; Duval et al, 1997). It has been cultivated for fiber and fruit juice and is a popular pantropical ornamental plant (Baker and Collins, 1939; Duval et al, 1997; Ma et al, 2015). Complicated molecular regulatory networks of genetics, signaling, and metabolic mechanisms may exist in Ananas comosus var. Gene expression analysis is a popular and powerful tool to elucidate these complicated molecular regulatory networks (Bustin et al, 2005)

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