HD2 Gene Family Can Modulate Root Length Development under NaCl Stresses in Arabidopsis
This study investigated the effects of HD2 gene family members on the primary root development and its responses to the salt treatment using an Arabidopsis thaliana HD2 family gene mutant and transgenic overexpression lines.Under the normal growth condition,the hd2q mutant resulted in a shorter primary root(5.29％reduction),while the HD2 overexpression lines promoted the elongation of the primary roots(12.94％to 28.24％increase).These phenotypic differences were even more pronounced after the treatment with 100 mmol/L NaCl.Additionally,HD2 family members accumulated proteins at the root tips,and their transcription and protein accumulation levels in the roots that significantly increased after NaCl treatment,with HD2A being substantially affected.These results indicate that the HD2 family members can promote the elongation of the primary roots under the normal growth and salt treatment conditions,which may relate to their effects on the cell division or elongation in the meristems and elongation zones.
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