RT Journal T1 PHYSIOLOGICAL ADAPTATIONS OF HENNA PLANT (LAWSONIA INERMIS L.) TO DIFFERENT IRRIGATION CONDITIONS IN TUNISIAN ARID REGION A1 H. Enneb A1 A. Belkadhi A1 A. Ferchichi JF Journal of Animal and Plant Sciences JO JAPS SN 1018-7081 VO 26 IS 4 SP 1026 OP 1033 YR 2016 FD 2016/08/01 DO DOI NA AB

In this study, we aim to investigate the photosynthetic adaptation of henna plants to various irrigation regimes and describe the effects of water stress on their growth performance and chlorophyll contents. For this reason, an experiment of four months was conducted. Henna plants were first grown in a greenhouse and then, exposed to three different irrigation regimes, whereby, they were irrigated up to the field capacity (FC) of 0% (control, T0), 50% of the control (moderate stress, T1) and 25% of the control (severe stress, T2). Results showed that exposure to drought induced an important decrease in gas exchange and photosynthetic pigment contents as compared to control. These shifts became more pronounced under severe stress (T2). Furthermore, after two harvests made, stomatal conductance and photosynthetic assimilation rates were significantly reduced under T2 conditions. In addition, a decline in total Chlorophyll amount and shoot dry weight was noticed, whereas, increases in the intrinsic water use efficiency and in the root-shoot ratio were discerned, especially, under the severe drought. These results revealed a close relationship between henna plants and irrigation dose and showed that for photosynthesis process and growth performance, the most appropriate water regime was the moderate stress (T1) rather than the severe stress (T2). 

K1 gas exchange, growth, Lawsonia inermis, photosynthesis, intrinsic water use efficiency, water stress PB Pakistan Agricultural Scientists Forum LK https://thejaps.org.pk/AbstractView.aspx?mid=2016-JAPS-134