Is callose a barrier for lead ions entering Lemna minor L

Author(s): Samardakiewicz S, Krzesłowska M, Bilski H, Bartosiewicz R, Woźny A


Plants have developed a range of strategies for resisting environmental stresses. One of the most common is the synthesis and deposition of callose, which functions as a barrier against stress factor penetration. The aim of our study was to examine whether callose forms an efficient barrier against Pb penetration in the roots of Lemna minor L. exposed to this metal. The obtained results showed that Pb induced callose synthesis in L. minor roots, but it was not deposited regularly in all tissues and cells. Callose occurred mainly in the protoderm and in the centre of the root tip (procambial central cylinder). Moreover, continuous callose bands, which could form an efficient barrier for Pb penetration, were formed only in the newly formed and anticlinal cell walls (CWs); while in other CWs, callose formed only small clusters or incomplete bands. Such an arrangement of callose within root CWs inefficiently protected the protoplast from Pb penetration. As a result, Pb was commonly present inside the root cells. In the light of the results, the barrier role of callose against metal ion penetration appears to be less obvious than previously believed. It was indicated that induction of callose synthesis is not enough for a successful blockade of the stress factor penetration. Furthermore, it would appear that the pattern of callose distribution has an important role in this defence strategy.

Similar Articles

A novel growing device inspired by plant root soil penetration behaviors

Author(s): Sadeghi A, Tonazzini A, Popova L, Mazzolai B

Two Rumex species from contrasting hydrological niches regulate flooding tolerance through distinct mechanisms

Author(s): van Veen H, Mustroph A, Barding GA, Vergeer–van Eijk M, Welschen–Evertman RA, et al.

An assessment of wheat yield sensitivity and breeding gains in hot environments

Author(s): Gourdji SM, Mathews KL, Reynolds M, Crossa J, Lobell DB

Integrated genomics, physiology and breeding approaches for improving drought tolerance in crops

Author(s): Mir RR, Zaman-Allah M, Sreenivasulu N, Trethowan R, Varshney RK

Thejasmonate pathway mediates salt tolerance in grapevines

Author(s): Ismail A, Riemann M, Nick P

Assessment of molecular diversity in chickpea (Cicerarietinum L

Author(s): Yadav A, Singh AL, Rai GK, Singh M

A role for lipid-mediated signaling in plant gravitropism

Author(s): Smith CM, Desai M, Land ES, Perera IY

Strigolactones as germination stimulants for root parasitic plants

Author(s): Yoneyama K, Awad AA, Xie X, Yoneyama K, Takeuchi Y

Growth coordination and the shoot epidermis

Author(s): Savaldi-Goldstein S, Chory J