Factors responsible for deep-sowing tolerance in wheat seedlings: varietal differences in cell proliferation and the co-ordinated synchronization of epidermal cell expansion and cortical cell division for the gibberellin-mediated elongation of first internodes

• DOI: 10.1093/aob/mcr173
• Publication Date: 2011-07-27T00:27:00Z
• Authors: Fumie Kato; Masaru Araki; Yutaka Miyazawa; Nobuharu Fujii; Kazuyoshi Takeda; Hiroshi Suge; Hideyuki Takahashi
• Keywords: Plant stem; Elongation

A wheat cultivar, Triticum aestivum 'Hong Mang Mai', shows tolerance to deep-sowing conditions by extreme elongation of the first internode, likely mediated gibberellin (GA) response. To understand factors involved in response this deep-sowing-tolerant cell expansion and division that confer on internodes seedlings were investigated. The lengths numbers epidermal cortical cells three cultivars measured. These parameters compared treated with A3 (GA3) or an inhibitor GA biosynthesis, uniconazole. varietal differences due resulting from different abilities division, but not expansion. In GA3, internode Mai' was 2-fold longer than control. GA-stimulated attributed increases number length cells. GA-responses observed these two tissues also detected other cultivars, although much lower noted Mai'. uniconazole exhibited reduced cells, both effects being more pronounced cultivar is able elongate a greater degree enhanced heightened GA. addition, epidermis cortex are synchronized for internodes. GA, well-co-ordinated synchronization yields rapid seedlings.