Developmental changes in cell and tissue water relations parameters in storage parenchyma of sugarcane

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Plant Physiology; (United States)

DOI:https://doi.org/10.1104/pp.96.3.794· OSTI ID:5888794

Moore, P H ^[1]; Cosgrove, D J ^[2]

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1. Department of Agriculture, Aiea, Hawaii (United States)
2. Pennsylvania State Univ., University Park (United States)

The osmotic pressure of the cell sap of stalk storage parenchyma of sugarcane (Saccharum spp. hybrids) increases by an order of magnitude during ontogeny to reach molar concentrations of sucrose at maturity. Stalk parenchyma cells must either experience very high turgor at maturation of have an ability to regulate turgor. The authors tested this hypothesis by using pressure probe techniques to quantify parameters of cell and tissue water relations of sugarcane storage parenchyma during ontogeny. The largest developmental change was in the volumetric elastic modulus, which increased from 6 bars in immature tissue to 43 bars in mature tissue. Turgor was maintained relatively low during sucrose accumulation by the partitioning of solutes between the cell and wall compartments. Membrane hydraulic conductivity decreased from about 12 {times} 10{sup {minus}7} centimeters per second per bar down to 4.4 {times} 10{sup {minus}7} centimeters per second per bar. The 2.7-fold decrease in membrane hydraulic conductivity during tissue maturation was accompanied by a 7.8-fold increase in wall elasticity. Integration of the cell and wall membrane properties appears to be by the opposing effects of turgor on hydraulic conductivity and elastic modulus. The changes in these properties during development of sugarcane stalk tissue may be a way for parenchyma cells to develop a capacity for expansive growth and still serve as a strong sink for storing high concentrations of sucrose.

• DOE Contract Number: FG02-84ER13179
• OSTI ID: 5888794
• Journal Information: Plant Physiology; (United States), Vol. 96:3; ISSN 0032-0889
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
SUGAR CANE
ONTOGENESIS
CELL MEMBRANES
HYDRAULIC CONDUCTIVITY
OSMOSIS
PLANT CELLS
PLANT SAP
SACCHAROSE
BIOLOGICAL MATERIALS
CARBOHYDRATES
CELL CONSTITUENTS
DIFFUSION
DISACCHARIDES
GRAMINEAE
LILIOPSIDA
MAGNOLIOPHYTA
MATERIALS
MEMBRANES
OLIGOSACCHARIDES
ORGANIC COMPOUNDS
PLANTS
REEDS
SACCHARIDES
551000* - Physiological Systems