Effect of growth regulators onVicia faba plants irrigated by sea water Leaf area, pigment content and photosynthetic activity

Abstract

The antagonistic effects of some growth regulators [Le. indol-3-yl-acetic acid (IAA), gibberellic acid (GA3) or kinetin] on stress imposed by sea water on leaf area, pigment and photosynthetic activity in leaves of broad bean plants at different stages of development were investigated. Seed priming with GA 3 alleviated either partially or completely the effects induced by the two levels of sea water (10 and 25 %) used on leaf area at all experimental stages. However, IAA, GA 3 and kinetin inhibited leaf growth by themselves in almost all measurements. Seed pretreatment with kinetin alleviated the inhibition of pigment production in sea water-irrigated plants. Furthermore, GA 3 or kinetin nullified the deleterious effects imposed by irrigation with sea water particularly the high level (25 %) on photosynthetic 14CO2 fixation.

Water Relations, Abscisic Acid and Yield of Wheat Plants in Relation to the Interactive Effect of Seawater and Growth Bioregulators

“…These results might explain the different effects of GA 3 and IAA on the WUE values obtained here. Furthermore, Aldesuquy and Gaber (1993) showed that, when seeds of Vicia faba were treated with IAA, GA 3 or kinetin and irrigated with seawater (10 and 25 %), these hormones either partially or completely alleviated the effects of salinity on leaf area at all growth stages. The same authors also found that IAA, GA 3 or kinetin counteracted the deleterious effects of seawater irrigation on photosynthetic activity.…”

“…Gibberellic acid (GA 3 ) and indole-3-acetic acid (IAA) were found to increase the plant growth and pigment content of salinized plants (Younis et al 1991, Aldesuquy 1992, 2000. Aldesuquy and Gaber (1993) demonstrated in Vicia faba that seed treatment with IAA, GA 3 or kinetin alleviated either partially or completely the eects induced by two levels of seawater (10 % and 25 %) on leaf area, pigment content, Hill activity of isolated chloroplasts and leaf photosynthetic activity.…”

“…Aldesuquy and Gaber (1993) demonstrated in Vicia faba that seed treatment with IAA, GA 3 or kinetin alleviated either partially or completely the effects induced by two levels of seawater (10 % and 25 %) on leaf area, pigment content, Hill activity of isolated chloroplasts and leaf photosynthetic activity.…”

Interactive Effect of Seawater and Growth Bioregulators on Water Relations, Abscisic Acid Concentration and Yield of Wheat Plants

“…Aldesuquy and Gaber (1993) demonstrated in Vicia faba that seed treatment with IAA, GA 3 or kinetin alleviated either partially or completely the effects induced by irrigation with two levels of seawater (10 and 25 %) on leaf area, pigment content, Hill activity of isolated chloroplast and leaf photosynthetic activity.…”

Growth and photosynthetic characteristics of Nigella sativa L. as affected by presowing seed treatment with kinetin

“…These have been particularly implicated in apical dominance, chloroplast development, anthocyanin production, and regulation of cell division as well as source-sink relationships (Hutchison and Kieber 2002). Moreover, CYTs are regarded as the most important senescence-retarding hormones (Faiss et al 1997) and their exogenous application has been demonstrated to inhibit the degradation of Chl and photosynthetic proteins (Wingler et al 1998), besides elevating photosynthetic rate and levels of key photosynthetic enzymes (Synková et al 1997, Chernyad'ev and Monakhova 1998, Shah 2007, and substantially modifying plant responses to varied environmental stresses (Aldesuquy and Gaber 1992, El-Shibaby et al 2002, Shah 2011.…”