The Electrochemical State of Cells of Broad Bean Roots I. Investigations of Elongating Roots of Young Seedlings

Scott, Bih; Gulline, Heather; Pallaghy, CK

doi:10.1071/bi9680185

Cited by 42 publications

(11 citation statements)

References 21 publications

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“…The concentration profiles of K + , Mg 2+ and Ca 2+ decreased from the root tip towards the base of the growth zone. This observation is consistent with the results of many other studies (Scott, Gulline & Pallaghi 1967; Silk et al . 1986; Walter et al .…”

Section: Discussionsupporting

confidence: 94%

Expansion dynamics, metabolite composition and substance transfer of the primary root growth zone ofZea maysL. grown in different external nutrient availabilities

Walter

Feil

Schurr

2003

Plant Cell & Environment

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A combined analysis of growth and metabolite composition was performed in primary roots of Zea mays L. (Var. Alexander). The seedlings were hydroponically cultivated either in pure water or in complete nutrient solution. The overall root growth performance was similar in both treatments. Yet, digital image sequence processing methods resolved, that growth distribution and oscillatory movements within the growth zone depended strongly on external nutrient availability. Metabolite concentration profiles were similar in both treatments for most investigated metabolites, indicating a thorough mobilization of nutrient resources from the seed, but concentrations of glutamine, glutamic acid, NO 3 -, NH 4 + + + + , malate and citrate showed pronounced differences between treatments. No diurnal variations in metabolite concentrations were found. Deposition rate profiles were in general more similar to relative elemental growth rate profiles than concentration profiles and were not affected by the treatment. Major ions were deposited maximally in front of the centre of growth activity, while greatest hexose deposition was found behind that. Relative to their abundance in the root growth zone, net rates of transfer from mature tissue were highest for sucrose, glutamic acid and aspartic acid, whereas glucose, fructose and most amino acids inversely showed high net rates of transfer out of the root growth zone, indicating a high catabolic rate for those substances there. NO 3 -, but not other nutrients, was transferred to a great extent from the root growth zone to the mature tissue in nutrient solution. Overall, the results show, that a careful analysis of growth dynamics allows quantifying and interpreting a number of important flux parameters in the growing organ and that the performance of the primary root does not depend strongly on external nutrient availability.

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Section: Discussionsupporting

confidence: 94%

Expansion dynamics, metabolite composition and substance transfer of the primary root growth zone ofZea maysL. grown in different external nutrient availabilities

Walter

Feil

Schurr

2003

Plant Cell & Environment

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“…In regions of the leaf where no cell division occurs, the relationship between cell length and the velocity of displacement of tissue from the ligule can be expressed as V A =(V F /L F ) L A , where V A is displacement velocity (lm h -1 ) and L A is cell length (lm) at a point A distal to the ligule. V F and L F are final velocity (or leaf elongation rate) and final cell length, respectively (Scott et al 1968;Carmona and Cuadrado 1986;Silk et al 1989). A thirdorder polynomial equation was fitted to values of V A and plotted against location distal to the ligule.…”

Section: Estimation Of Cell Elongation Ratesmentioning

confidence: 98%

Relationship of growth cessation with the formation of diferulate cross-links and p -coumaroylated lignins in tall fescue leaf blades

MacAdam

Grabber

2002

Planta

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We examined relationships among cell wall feruloylation, diferulate cross-linking, p-coumarate deposition, and apoplastic peroxidase (EC 1.11.1.7) activity with changes in the elongation rate of leaf blades of slow and rapid elongating genotypes of tall fescue ( Festuca arundinacea Schreb.). Growth was not directly influenced by ferulic acid deposition but leaf elongation decelerated as 8-5-, 8- O-4-, 8-8-, and 5-5-coupled diferulic acids accumulated in cell walls. Growth rapidly slowed and stopped with the deposition of p-coumarate, which is primarily associated with lignification in grass cell walls. Accretion of ferulate, diferulates and p-coumarate continued after growth ended, into the later stages of secondary wall formation. The concentration of 8-coupled diferulates dwarfed that of the more commonly measured 5-5-coupled isomer, suggesting that the latter dimer is a poor indicator of diferulate cross-linking in cell walls. Further work is required to clearly demonstrate the role of diferulate cross-linking and p-coumaroylated lignins in the cessation of leaf growth in grasses.

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“…In an earlier paper, Scott, Gulline, and Pallaghy (1968) attempted to apply electrochemical theory to describe the movement of ions between the cells of intact roots of growing broad bean seedlings and the external medium.…”

Section: Introductionmentioning

confidence: 99%

“…In the intact seedling, further complications may arise because of the non-homogeneous cell population, and ion fluxes along the root axis from the cotyledon. Although Scott, Gulline, and Pallaghy (1968) argue that valid estimates of fluxes in growing root cells can be obtained in short-term (1-2 hr) isotope experiments in some circumstances (particularly for sodium), it is obvious that these tentative conclusions need to be examined further, in more complete kinetic analyses which necessarily must be made on non-growing root tissue.…”

Section: Introductionmentioning

confidence: 99%

The Eleotroohemical State of Oells of Broad Bean Roots II. Potassium Kinetics in Excised Root Tissue

Allaghy¹,

Scott²

1969

Aust. Jnl. Of Bio. Sci.

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The Electrochemical State of Cells of Broad Bean Roots I. Investigations of Elongating Roots of Young Seedlings

Cited by 42 publications

References 21 publications

Expansion dynamics, metabolite composition and substance transfer of the primary root growth zone ofZea maysL. grown in different external nutrient availabilities

Expansion dynamics, metabolite composition and substance transfer of the primary root growth zone ofZea maysL. grown in different external nutrient availabilities

Relationship of growth cessation with the formation of diferulate cross-links and p -coumaroylated lignins in tall fescue leaf blades

The Eleotroohemical State of Oells of Broad Bean Roots II. Potassium Kinetics in Excised Root Tissue

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