Effects of aluminium on root growth and apical root cells in rice (Oryza sativa L.) cultivars. Reliability of screening tests to detect Al resistance at the seedling stage

Abstract

The effects of Al 2 (SO 4 ) 3 Á18H 2 O on growth of root and apical root cells were studied in seedlings of rice cultivars differing in Al resistance including I Kong Pao and Aiwu (Al-sensitive) and IRAT 112 and IR6023-10-1-1 (Al-resistant). Inhibition of root growth was a typical effect of Al, and the extent of the inhibition depended on both cultivar and Al concentration. Al impaired the activity of the root meristem as indicated by reductions in its size, mitotic activity and the diameter of the meristematic cell nucleoli. Cell size in the elongation zone of the root was also reduced by Al. The reliability of the haematoxylin staining method to classify rice cultivars according to their Al-sensitivity failed to discriminate the Al-resistant IR6023-10-1-1 cultivar from the two sensitive cultivars. The results are discussed in relation to the Al resistance mechanisms operating in rice.

Effects of aluminum on the elongation and external morphology of root tips in two maize genotypes

“…Cross sections of Al-treated roots showed that Al did not enter beyond the subepidermal layer of the root tissue (Miftahudin et al 2007). Moreover, this method cannot discriminate between the Al in the apoplast or in the symplast and sometimes failed to differentiate rice cultivars according to their sensitivity to Al (Miftahudin et al 2007;Macêdo et al 2009). …”

Aluminum in mineral nutrition of upland rice plants

“…With the application of Al 3+ , there was an increase in the N content in the roots ( Figure 1B). This was due to the concentration effect, due to the toxic action of Al 3+ on root growth (Macêdo et al, 2009); this can be confirmed by the accumulation of N in the root ( Figure 1D), because as there was an increase in Al 3+ doses, N accumulation was lower in the roots. There was also a decrease in N accumulation in the shoot ( Figure 1C).…”

“…Toxicity caused by Al 3+ in plants has its primary effect on the roots, inhibiting their growth (Macêdo et al, 2009). The roots of plants under Al 3+ stress become atrophied, brittle, thinly branched, have increased cell wall stiffness and thickness, and undergo changes in membrane transport proteins (Meriga et al, 2010;Motoda et al, 2010;Sun et al, 2010;Garzon et al, 2011;Guo et al, 2012).…”

Produktivitas Tiga Genotipe Kedelai dengan Air Berbeda dan Kedalaman Muka Air pada Berbagai Kondisi Tanah di Pasang Surut

“…Penghambatan pertumbuhan akar akan mengurangi vigor dan hasil tanaman (Kochian et al, 2005). Pengaruh utama cekaman Al dalam menghambat pertumbuhan akar tanaman tampak pendek dan tebal (de Macedo et al, 2009;Yu et al, 2011 sehingga menjadi kendala dalam produksi tanaman di tanah masam (Kochian et al, 2004;Zheng, 2010 .…”