EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The use of lanthanum to delineate the aluminium signalling mechanisms functioning in the roots of Zea mays L


Environmental & Experimental Botany 32(4): 365-376
The use of lanthanum to delineate the aluminium signalling mechanisms functioning in the roots of Zea mays L
Controlled environment studies involving the treatment of intact roots with Al (5mg/dm-3) and La-3+ (25 mg/dm-3) have identified some notable similarities in the early reactions by primary roots to these ions. These included root growth inhibition, changes in cap size and construction as well as a marked decline in cap secretory activity. The effects of La-3+ nevertheless appeared to be less damaging to the root than comparable Al treatments (shorter lag periods and faster growth rates). Moreover, roots subjected to "continuous" La-3+ treatments resumed growth with times gtoreq 6 days whereas roots subjected to "continuous" Al treatment did not. These similarities and differences in the response of root cells to La-3+ and Al are discussed with a view to the possible development of La-3+ as an ultrastructural tracer for Al. Roots which had previously been treated with La-3+ or Al but which received Ca-2+ during the recovery phase resumed growth during the course of the experiment (8 days). In contrast Ca-2+ deprivation of roots initially subjected to Al or La-3+ treatments delayed and in some cases prevented recovery. The effects of Ca-2+ deprivation on the stages involved in recovery are discussed in relation to identifying an external (apoplasmic) Ca-2+ requirement which influences the activity of the root cap and mediates the reversal of growth inhibition attributed to the effects of La-3+ and Al. The requirement for an exogenous Ca-2+ supply is combined with data pertaining to Al- and La-3+-induced ultrastructural changes in the apoplasm of peripheral root cap cells to identify components of a stimulus-response system functioning in the root which is responsive to La-3+ and Al. Changes in La-3+- and Al-treated roots deprived of Ca-2+ during recovery also coincided with a re-orientation of shoot growth. These effects are considered in relation to a possible external requirement, by the root, for Ca-2+ which interacts with an endogenous programme involved in modulating shoot expansion and development.

Accession: 002530409

DOI: 10.1016/0098-8472(92)90049-8

Download PDF Full Text: The use of lanthanum to delineate the aluminium signalling mechanisms functioning in the roots of Zea mays L



Related references

The use of lanthanum to delineate the aluminum signalling mechanisms functioning in the roots of Zea mays L. Environmental and experimental botany 32(4): 365-376, 1992

Use of lanthanum to delineate mechanisms of calcium dependent actions in different isolated muscle systems. Acta Physiologica Scandinavica Supplementum 396: 127, 1973

Abscisic acid response of corn (Zea mays L.) roots and protoplasts to lanthanum. Journal of Plant Growth Regulation 27(1): 19-25, 2008

Lanthanum localization in roots of zea mays salicornia virginica and spartina alterniflora. Plant Physiology (Rockville) 67(4 SUPPL): 157, 1981

Changes in protein content and protease activity in roots of Zea mays (L.) in response to short-term aluminium treatment. Plant nutrition: food security and sustainability of agro ecosystems through basic and applied research Fourteenth International Plant Nutrition Colloquium, Hannover, Germany: 518-519, 2001

The recovery of the roots of Zea mays L. from various aluminium treatments: towards elucidating the regulatory processes that underlie root growth control. Environmental and Experimental Botany 31(2): 153-163, 1991

Effect of aluminium on the activity of apoplastic acid phosphatase and the exudation of macromolecules by roots and suspension-culture cells of Zea mays L. Journal of plant physiology 159(11): 1213-1218, 2002

Aluminium partitioning in intact roots of aluminium-tolerant and aluminium-sensitive wheat (Triticum aestivum L.) cultivars. Plant Physiology 99(3): 1021-1028, 1992

Kinetics of aluminium uptake by excised roots of aluminium-tolerant and aluminium-sensitive cultivars of Triticum aestivum L. Plant Physiology 91(3): 1094-1099, 1989

Aluminium toxicity in roots. Correlation among ionic currents, ion fluxes, and root elongation in aluminium-sensitive and aluminium-tolerant wheat cultivars. Plant Physiology 99(3): 1193-1200, 1992