Physio-ecological responses to drought and subsequent re-watering in sorghum seedlings

doi:10.11686/cyxb2017410

Abstract

Abstract: Adaption to drought in plants includes drought resistance during the drought period and post drought recovery. The aim of this study was to investigate the relationships between drought resistance and drought recovery and to determine the physiological parameters which could be used to indicate drought adaptability. Eight sorghum cultivars grown in pots were exposed to drought and re-watering treatments during the seedling stage. Biomass, relative water content, water potential, osmotic potential, and photosynthetic parameters were measured. The results showed that “LZ21”“ had the highest drought resistance; biomass production under drought stress was not different to the control (well watered), while “GZZ”“ and “Gadambalia”“ had poor drought resistance producing 38% and 34% less biomass under drought stress. Relative water content, water potential, osmotic potential, chlorophyll content and photosynthetic parameters decreased after imposition of drought but all parameters recovered fully after re-watering. Correlation analysis showed that drought adaption is more closely related to drought recovery (r=0.85) than drought resistance (r=0.46). Maintaining higher photosynthetic and lower transpiration rate contributed to drought resistance while maintaining high relative water content improves drought recovery. These results demonstrated that drought recovery ability is more important for drought adaption than drought resistance. The physiological basis of drought resistance and drought recovery are clearly different. Relative water content and photosynthetic rate could be used to select drought adapted cultivars in sorghum.

Key words: sorghum, drought, drought adaptation, drought resistance, drought recovery, re-watering

LIU Ting-ting, CHEN Dao-qian, WANG Shi-wen, YIN Li-na, DENG Xi-ping. Physio-ecological responses to drought and subsequent re-watering in sorghum seedlings[J]. Acta Prataculturae Sinica, 2018, 27(6): 100-110.

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