Vernalization and Photoperiods Mediated IAA and ABA Synthesis Genes Expression in Beta vulgaris

Biennial plants perceived seasonal stimuli through the photoperiods and vernalization pathways respectively to optimize developmental time. Photoperiods combining with vernalization modulate hormone homeostasis to promote plant normally growth. IAA and ABA play important roles in plant development. Although a series of IAA and ABA genes and their regulation mechanisms have been investigated and characterized extensively in model plants, these underlined mechanisms in Beta vulgaris L. especially under abiotic stress were not entirely clear. This study aimed at exploring IAA and ABA biosynthetic pathway genes and investigating their expression patterns and quantitating analysis hormone by UPLC-MS/MS (ultra performance liquid chromatography-tandem mass spectrometry) in order to demonstrate the molecular mechanism of phytohormone in B. vulgaris. As the results showed BvNIT4 and BvIAA8 contributed to IAA accumulation under nonvernalization condition. Endogenous ABA accumulation in leaves was contributed coordinately by the expression of BvABA2 and BvNCED1 genes both in the vernalized and nonvernalized samples under long day conditions. Vernalization and photoperiods indeed disturb phytohormone genes expression patterns, which data were consistent with the previous studies. New insight was provided to further clarify the molecular mechanism of endogenous hormone in B. vulgaris.