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Effects of propiconazole on rice growth and gene expression in response to nitrogen and phosphorus deficiencies

Kewalee Jantapo^a,b, Sompop Pinit^a,b, Lili Zhou^c, Wenfei Wang^c, Juthamas Chaiwanon^b,*

 
ABSTRACT:     Nitrogen (N) and phosphorus (P) are essential macronutrients required for plant growth and development. Under N and inorganic phosphate (Pi) deficiencies, plants undergo adaptation at physiological, morphological, and transcriptional levels via modulation of endogenous signals, such as phytohormones, in an attempt to increase nutrient acquisition from the environment. Biosynthesis of brassinosteroid (BR), a class of plant hormones, has been shown to be crucial in nutrient deficiency responses in the plant model Arabidopsis. In this study, the responses of rice (Oryza sativa L.) to N and Pi deficiencies were investigated using rice seedlings grown in the presence and absence of a BR biosynthesis inhibitor, propiconazole (PPZ). Transcript levels of BR biosynthesis genes were induced by N and Pi deficiencies. PPZ-treated plants showed retarded growth in both sufficient and deficient conditions. Besides, gene expression of N- and Pi-deficiency-responsive genes was also attenuated by PPZ treatments. These results suggest that inhibition of BR biosynthesis by PPZ could restrain plant growth and adaptation in response to both N and Pi deficiencies.

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* Corresponding author, E-mail: juthamas.c@chula.ac.th

Received 10 Nov 2020, Accepted 17 May 2021