Introduction
Proteins regulate how plants, such as rice, maintain a
health acidity (pH) while absorbing nitrogen from various forms such as
ammonium nitrate. A protein is useful to
provide buffering to the plant cells; manipulation of the levels of a specific protein can have a
very beneficial effect on rice yields.
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Significance
Significant
progress has been made in our understanding of plant adaptive responses to
maintain cellular pH under varied N supply forms. Rice is a plant adapted to
grow in waterlogged or dryland environments, in contrast to other crops, such
as wheat, soybean, and maize. The nitrate transporter OsNRT2.3b provides a
molecular mechanism explaining plant adaptation to the ammonium-nitrate supply
shift between the waterlogged and drained soil environments. The sensing of
cytosolic pH by OsNRT2.3b can function to improve rice nitrogen use efficiency
and pH balance, providing an explanation for plant adaptation to changes in the
form of N supply.
Abstract
…In
this study, we analyzed the function of a nitrate transporter, OsNRT2.3, with
natural variation of its expression in rice cultivars and the cytosolic pH
regulatory motif in the protein. The high expression of one of the two splice
forms of this protein, OsNRT2.3b, in rice resulted in better adaptation to
changes of N supply forms in the environment and strong improvements in growth,
yield, and nitrogen use efficiency (NUE). Our results have significant
implications for the understanding of cytosolic pH balance in plant adaptation
and its importance for crop improvement.
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