Abstract
Phosphite (PHI) has been used in the management of Phytophthora diseases since the 1970s.We assessed the effect of PHI on controlling the incidence of Xanthomonas oryzae pv.oryzae and Pyricularia grisea. As a result, PHI application significantly inhibited the incidence of the diseases. To clarify the molecular mechanism underlying this, a transcriptome study was employed. In total, 2064 differentially expressed genes (DEGs) were identified between control and PHI treatment. The key DEGs could be classified into phenylpropanoid biosynthesis (ko00940), starch and sucrose metabolism (ko00500), and plant hormone signal transduction (ko04075). The expressions of defense-related genes had a higher expression lever upon PHI treatment. This study provides new insights into the mechanism of protection effect of PHI against pathogens.
Highlights
Phosphorus (P) is among the critical macronutrients required by all living organisms
Application of PHI resulted in a reduced susceptibility to Xanthomonas oryzae pv.oryzae and Pyricularia grisea
PHI is extensively applied to plants for the protection of diseases mainly caused by oomycetes [22]
Summary
Phosphorus (P) is among the critical macronutrients required by all living organisms. It is essential for plant growth and development; the deficiency of P severely limits the growth and the yield in crops [1]. Element P tends to form compounds combined with other elements, such as oxygen (O) or hydrogen (H). When fully oxidized, it exists as a phosphate molecule. It forms a phosphite (PHI) when not fully oxidized. Phosphate compounds are the most utilized form that could be supplied to plants as
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