TY - JOUR AU - CHEMLALI, Imen AU - YAHIA, Kaouther Ben AU - BELAÏD, Souda AU - RABEH, Sonia Ben AU - ROMDHANE, Chokri Ben AU - MESSOUDI, Noomen AU - SAADAOUI, Ezzeddine PY - 2022/09/23 Y2 - 2024/03/29 TI - Anatomical, physiological, biochemical and molecular responses of Eucalyptus spp. under water deficit conditions and characteristics of Tunisian arid species: an overview JF - Notulae Scientia Biologicae JA - Not Sci Biol VL - 14 IS - 3 SE - Review articles DO - 10.55779/nsb14311218 UR - https://www.notulaebiologicae.ro/index.php/nsb/article/view/11218 SP - 11218 AB - <p>The genus <em>Eucalyptus </em>occurs in a large range of environmental conditions, mainly arid/semi-arid areas. It includes species with high capacity to survive with extremely low water potential. For that, our review shows an important effect of drought on <em>Eucalyptus </em>spp. plants’ resistance mechanisms and management strategies. In fact, water stress acts directly on growth, productivity, yield, it affects also response to pests and diseases, disturbs wood formation and essential oil yield. However, the general patterns of response to water stress varied among species, genotypes, hybrids and clones. To assume, reducing water loss in eucalyptus species is manifested by reducing leaves area, reducing gas exchange, increasing water uptake thanks to a prolific and deep root systems. A greater accumulation of osmolytes that gives rise to osmotic adjustment including carbohydrates especially cyclitols and quercitol, other amino acids and organic acids, also some proteins which play a vital role in sustaining cellular functions under drought conditions. More than that, water stress increases mainly the levels of pigments, chlorophyll fluorescence parameters, malondialdehyde (MDA), abscisic acid (ABA) and the biosynthesis of triacylglycerols (TAGs) in <em>Eucalyptus</em> species.</p> ER -