Altered Expression of the Malate-Permeable Anion Channel OsALMT4 Reduces the Growth of Rice Under Low Radiance

Frontiers in Plant Science
Jie LiuPeter R Ryan

Abstract

We examined the function of OsALMT4 in rice (Oryza sativa L.) which is a member of the aluminum-activated malate transporter family. Previous studies showed that OsALMT4 localizes to the plasma membrane and that expression in transgenic rice lines results in a constitutive release of malate from the roots. Here, we show that OsALMT4 is expressed widely in roots, shoots, flowers, and grain but not guard cells. Expression was also affected by ionic and osmotic stress, light and to the hormones ABA, IAA, and salicylic acid. Malate efflux from the transgenic plants over-expressing OsALMT4 was inhibited by niflumate and salicylic acid. Growth of transgenic lines with either increased OsALMT4 expression or reduced expression was measured in different environments. Light intensity caused significant differences in growth between the transgenic lines and controls. When day-time light was reduced from 700 to 300 μmol m-2s-1 independent transgenic lines with either increased or decreased OsALMT4 expression accumulated less biomass compared to their null controls. This response was not associated with differences in photosynthetic capacity, stomatal conductance or sugar concentrations in tissues. We propose that by disrupting malate fluxe...Continue Reading

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Citations

Mar 31, 2019·International Journal of Molecular Sciences·Xiang ZhangJixing Xia
Jan 5, 2021·Frontiers in Plant Science·Jenny Johana Gallo-FrancoMauricio Quimbaya

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Datasets Mentioned

BETA
GQ848049.1
GQ848073.1

Methods Mentioned

BETA
transgenic
PCR
dissection

Software Mentioned

Bio
Agilent MassHunter Quantitative Analysis
SigmaPlot TM
Rad CFX Manager

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