Efficient use of energy in anoxia-tolerant plants with focus on germinating rice seedlings

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

© 2014 New Phytologist Trust. Anoxia tolerance in plants is distinguished by direction of the sparse supply of energy to processes crucial to cell maintenance and sometimes to growth, as in rice seedlings. In anoxic rice coleoptiles energy is used to synthesise proteins, take up K+, synthesise cell walls and lipids, and in cell maintenance. Maintenance of electrochemical H+ gradients across the tonoplast and plasma membrane is crucial for solute compartmentation and thus survival. These gradients sustain some H+-solute cotransport and regulate cytoplasmic pH. Pyrophosphate (PPi), the alternative energy donor to ATP, allows direction of energy to the vacuolar H+-PPiase, sustaining H+ gradients across the tonoplast. When energy production is critically low, operation of a biochemical pHstat allows H+-solute cotransport across plasma membranes to continue for at least for 18 h. In active (e.g. growing) cells, PPi produced during substantial polymer synthesis allows conversion of PPi to ATP by PPi-phosphofructokinase (PFK). In quiescent cells with little polymer synthesis and associated PPi formation, the PPi required by the vacuolar H+-PPiase and UDPG pyrophosphorylase involved in sucrose mobilisation via sucrose synthase might be produced by conversion of ATP to PPi through reversible glycolytic enzymes, presumably pyruvate orthophosphate dikinase. These hypotheses need testing with species characterised by contrasting anoxia tolerance.
Original languageEnglish
Pages (from-to)36-56
JournalNew Phytologist
Volume206
Issue number1
DOIs
Publication statusPublished - 2015

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Seedlings
hypoxia
peptidylprolyl isomerase
Peptidylprolyl Isomerase
solutes
rice
seedlings
Adenosine Triphosphate
tonoplast
Maintenance
energy
polymers
Orthophosphate Dikinase Pyruvate
Polymers
UTP-Glucose-1-Phosphate Uridylyltransferase
plasma membrane
Cell Membrane
cells
Phosphofructokinases
phosphofructokinases

Cite this

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title = "Efficient use of energy in anoxia-tolerant plants with focus on germinating rice seedlings",
abstract = "{\circledC} 2014 New Phytologist Trust. Anoxia tolerance in plants is distinguished by direction of the sparse supply of energy to processes crucial to cell maintenance and sometimes to growth, as in rice seedlings. In anoxic rice coleoptiles energy is used to synthesise proteins, take up K+, synthesise cell walls and lipids, and in cell maintenance. Maintenance of electrochemical H+ gradients across the tonoplast and plasma membrane is crucial for solute compartmentation and thus survival. These gradients sustain some H+-solute cotransport and regulate cytoplasmic pH. Pyrophosphate (PPi), the alternative energy donor to ATP, allows direction of energy to the vacuolar H+-PPiase, sustaining H+ gradients across the tonoplast. When energy production is critically low, operation of a biochemical pHstat allows H+-solute cotransport across plasma membranes to continue for at least for 18 h. In active (e.g. growing) cells, PPi produced during substantial polymer synthesis allows conversion of PPi to ATP by PPi-phosphofructokinase (PFK). In quiescent cells with little polymer synthesis and associated PPi formation, the PPi required by the vacuolar H+-PPiase and UDPG pyrophosphorylase involved in sucrose mobilisation via sucrose synthase might be produced by conversion of ATP to PPi through reversible glycolytic enzymes, presumably pyruvate orthophosphate dikinase. These hypotheses need testing with species characterised by contrasting anoxia tolerance.",
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Efficient use of energy in anoxia-tolerant plants with focus on germinating rice seedlings. / Atwell, B.J.; Greenway, Hendrik; Colmer, Tim.

In: New Phytologist, Vol. 206, No. 1, 2015, p. 36-56.

Research output: Contribution to journalArticle

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AB - © 2014 New Phytologist Trust. Anoxia tolerance in plants is distinguished by direction of the sparse supply of energy to processes crucial to cell maintenance and sometimes to growth, as in rice seedlings. In anoxic rice coleoptiles energy is used to synthesise proteins, take up K+, synthesise cell walls and lipids, and in cell maintenance. Maintenance of electrochemical H+ gradients across the tonoplast and plasma membrane is crucial for solute compartmentation and thus survival. These gradients sustain some H+-solute cotransport and regulate cytoplasmic pH. Pyrophosphate (PPi), the alternative energy donor to ATP, allows direction of energy to the vacuolar H+-PPiase, sustaining H+ gradients across the tonoplast. When energy production is critically low, operation of a biochemical pHstat allows H+-solute cotransport across plasma membranes to continue for at least for 18 h. In active (e.g. growing) cells, PPi produced during substantial polymer synthesis allows conversion of PPi to ATP by PPi-phosphofructokinase (PFK). In quiescent cells with little polymer synthesis and associated PPi formation, the PPi required by the vacuolar H+-PPiase and UDPG pyrophosphorylase involved in sucrose mobilisation via sucrose synthase might be produced by conversion of ATP to PPi through reversible glycolytic enzymes, presumably pyruvate orthophosphate dikinase. These hypotheses need testing with species characterised by contrasting anoxia tolerance.

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