Boron amelioration of aluminum toxicity in mungbean seedlings

Abstract

Boron (B) amelioration of aluminum (Al) toxicity was studied for growth of mungbean (Phaseolus aureus Roxb.) seedlings and cuttings (without roots) in a growth chamber. Mungbean seedlings and cuttings were grown in the solution with combinations of three concentrations of B (0,5, and 50 μM) and three concentrations of Al (0, 2, and 5 mM) in randomized complete block design experiments for 16 days. Results showed that B significantly promoted elongation of epicotyls and hypocotyls, and increased height of seedlings grown under Al stress. Boron also increased fresh weight of seedlings in high Al solution. Treatment of plants grown with high B and Al stress had no apparent effect on fresh and dry weights of seedling roots. Seedling dry weight increased significantly by adding high B to solutions with 2 mM or 5 mM Al. No significant differences were observed between the high B treatment and the control (normal B, 5 μM) in lengths of epicotyls and fresh and dry weights of mungbean cuttings grown under Al stress. High concentrations of B decreased soluble protein and increased chlorophyll in seedlings treated with 2 mM Al. Boron had no amelioration effect on cuttings grown with Al, although Al increased soluble protein. Our results suggested that B alleviation of Al toxicity was related to root function and Al toxicity may possibly be due, in part, to B deficiency.

Boron alleviates aluminum toxicity in pea (Pisum sativum)

“…Stass et al (2007) reported that B deficiency aggravated Al toxicity of the common bean roots compared to B sufficiency. Yang and Zhang (1998) found that the role of B in alleviating Al toxicity was limited to intact young seedlings of mung beans, but had no effect on cuttings, indicating that the alleviation of Al 3+ toxicity by B is related to the root function. However, only a little evidence has been presented in monocotyledonous plants on whether B is capable of ameliorating Al toxicity or that B deficiency enhances Al toxicity (Taylor and Macfie 1994;Reid and Stangoulis 2000;Wang et al 2005;Corrales et al 2008).…”

Physiological Limits to Zinc Biofortification of Edible Crops

“…Bars represent maximum and minimum values obtained for large collections of cassava (Chávez et al, 2005), sweet potato (Pfeiffer and McClafferty, 2007), carrot (Nicolle et al, 2004), chickpea (leaves; Ibrikci et al, 2003), Brassica oleracea (Broadley et al, 2010), Brassica rapa (Wu et al, 2007), spinach (Grusak and Cakmak, 2005), rice (Yang et al, 1998), wheat (Graham et al, 1999), maize (Bänziger and Long, 2000), pearl millet (Velu et al, 2007), barley (P. J. White and I. J. Bingham cited in White and Broadley, 2009), sorghum (Reddy et al, 2005), bean (Islam et al, 2002), pea (Grusak and Cakmak, 2005), cowpea (Pfeiffer and McClafferty, 2007), chickpea (seed, M. A. Grusak cited in White and Broadley, 2009), lentil (Pfeiffer and McClafferty, 2007), soybean (Raboy et al, 1984), peanut (Branch and Gaines, 1983), potatoes (White et al, 2009), and yam (Agbor-Egbe and Trèche, 1995) genotypes.…”

“…Absolute Zn concentrations and genetic variation in Zn concentrations are often lower in seeds than in leaves. Nevertheless, between 2.2- and 11.6-fold variation in seed Zn concentrations have been observed in large core collections of cereal germplasm (e.g., Yang et al, 1998; Graham et al, 1999; Bänziger and Long, 2000; Gregorio et al, 2000; Reddy et al, 2005) and between 1.8- and 6.6-fold variation in seed Zn concentrations in large core collections of legume germplasm (Raboy et al, 1984; Islam et al, 2002; Grusak and Cakmak, 2005; Pfeiffer and McClafferty, 2007; White and Broadley, 2009). Fruits generally have low Zn concentrations, and studies report about twofold variation among three to six cultivars in strawberries (Hakala et al, 2003), apples (Iwane, 1991), and plantains (Davey et al, 2007).…”

Adaptação de Tibouchina granulosa Submetida à Aplicação de Alumínio

“…(Paliwal & Sivaguru, 1994) e em Canela Santa (Vochysia tucanorum) (Yang & Zhang, 1998;Yang et al, 1999;Yang & Chen, 2001), todos esses autores observaram redução nos teores de clorofilas provocada pelo aplicação de alumínio.…”