Gibberellins and tuberization in potato

Abstract

SummaryThe evidence for a role of gibberellins in the regulation of potato tuber formation is reviewed. Endogenous gibberellin levels in plants are high under non-inducing conditions and decrease under inducing conditions. Exogenously applied gibberellins inhibit tuber formation, whereas applying inhibitors of gibberellin biosynthesis has the opposite effect. Cellular events involved in tuberization, viz., cell division, cell enlargement and orientation of micro-tubules, are also reviewed. Based on available evidence, a major regulatory role of gibberellins is suggested. However, it is also argued that tuber formation is not simply regulated by gibberellins acting as the sole signal between above-ground and below-ground parts, since stolon tips are able to synthesize their own gibberellins, and the phenotype of phytochrome B-antisense plants cannot be explained only by altered levels of GAs.

The effects of explant rotation, medium types, JA and GA3 additions on in vitro microtuber production from potato (Solanum tuberosum L.)

“…In a similar study, it was observed that when gibberellins were added externally, it had a negative effect on tuber development, although internal GA 3 supported tuber development [45]. Tuber formation and its subsequent development, is a result of cell division and cell growth.…”

“…Vreugdenhil and Sergeeva [45] deduced that internal gibberellin levels were high during condition where tuber development did not occur, and were low during conditions where tuber development did occur. When gibberellin biosynthesis inhibitors (CCC, paclobutrazol, etc.)…”

Aplicación periódica de bajas concentraciones de paclobutrazol y ácido salicílico en papa en invernadero

“…Gibberellins acting as inhibitor tuberisation Krauss (1985) and in induction conditions tuberisation low contribution of altered nitrogen radius of abscisic acid hormones: gibberellins, increased the abscisic acid and decreased the amount of gibberellins, which it coincided with the start of the tuberisation Krauss and Marschner (1981). Endogenous levels of gibberellins in potato plants are high in non-inductive conditions (high temperatures and long photoperiod) and decrease under conditions of induction tuberisation (Vreugdenhil and Sergeeva, 1999).…”

Aspects of bulblet growth of lily in vitro

“…All classes of hormones were found to have some effect on the formation of tubers and bulbs (Vreugdenhil and Sergeeva, 1999). The major ones are discussed below.…”

“…Gibberellins inhibit tuberization, cause stolons to elongate rather than to swell, and inhibit starch accumulation and the synthesis of tuber-specific proteins (Xu et al, 1998;Vreugdenhil and Sergeeva, 1999). The effect of the gibberellin-synthesis inhibitors on growth and development of oriental lily hybrids has been examined and with these growth retardants heavy bulblets were obtained (Kumar et al, 2005).…”