Fig. 7From: Drought-hardening improves drought tolerance in Nicotiana tabacum at physiological, biochemical, and molecular levelsEffect of drought-hardening on proline and soluble sugar contents in response to drought stress. Drought-hardening enhanced the Proline (a) and Soluble Sugars (SS) (b) contents in the two tobacco variety seedlings under drought stress. The values are presented as means ± SDs, different letters indicating significant differences at p < 0.05 by LSD test. HCK represents HongHuaDaJinYuan seedlings with no drought-hardening; HT1 indicates 24 h drought-hardened seedlings of HongHuaDaJinYuan; HT2 indicates 48 h drought-hardened seedlings of HongHuaDaJinYuan; HT3 indicates 72 h drought-hardened seedlings of HongHuaDaJinYuan; YCK represents Yun Yan-100 seedlings with no drought-hardening; YT1 indicates 24 h drought-hardened seedlings of Yun Yan-100; YT2 indicates 48 h drought-hardened seedlings of Yun Yan-100; YT3 indicates 72 h drought-hardened seedlings of Yun Yan-100Back to article page