The results showed that cell wall changes commenced within 0·5 d and were initiated by ethylene in parallel with cytoplasmic and nucleoplasmic events associated with classic intracellular processes of programmed cell death
2003
Rapid changes in cell wall pectic polysaccharides are closely associated with early stages of aerenchyma formation, a spatially localized form of programmed cell death in roots of maize (Zea mays L.) promoted by ethylene
Scholarcy highlights
- Plant roots growing in waterlogged soils are at risk from anoxia unless they can secure a supply of oxygen to replace that normally provided by well-aerated soil
- Roots grown in 3% oxygen or 1 μL L−1 ethylene had slower root extension than those grown in 21% oxygen over 4 d
- In control roots treated with 21% oxygen, punctate labelling was restricted to points of contact between adjacent cell walls within three-way junctions of cortical cells
- In carrot root apices, deesterified pectin was found at the inner surface of the primary cell wall, adjacent to the plasma membrane, in the middle lamella and at intercellular spaces, whereas esterified pectin was located evenly throughout the wall
- JIM 5 staining occurred in the cell walls of intercellular spaces, whereas JIM 7 was most abundant in the cells of the cortex and stele
- The results of this study indicate that cell wall changes involving both esterified and de-esterified pectins are induced by hypoxia or ethylene in the roots of maize within 12 h
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