Chakhchar A, Chaguer N, Ferradous A, Filali-Maltouf A, El Modafar C
a Laboratoire de Biotechnologie et Bio-ingénierie Moléculaire, Faculté des Sciences et Techniques Guéliz , Université Cadi Ayyad , Marrakech , Maroc.
b Centre Régional de la Recherche Forestière Marrakech , Ain Itti Ennakhil , Marrakech , Maroc.
Plant Signal Behav. 2018;13(7):e1489669. doi: 10.1080/15592324.2018.1489669. Epub 2018 Jul 23.
The argane tree is a remarkable essence by its botanical interest and its socioeconomic value. It is endemic species in the southwest of Morocco, where prolonged drought stress may occur. Although its tolerance has been commonly attributed to various mechanisms at the whole plant, the root system has a main role in the whole process of adaptation. We studied in argane tree plants the change in hydraulic conductivity, electrolyte leakage in root as well as root growth under drought stress and recovery. Our findings showed that the root hydraulic conductivity (Lp) value significantly decreased under drought stress treatment. This was associated with an increase of root electrolyte leakage, signaling the occurrence of an injury to root cell membranes. At root growth level, stressed plants managed to maintain their root elongation despite decreased root mass. After short period of rehydration, the argane tree plants exhibited a tendency of increased hydraulic conductivity during recovery after drought stress, suggesting that this root physiological response may be intimately linked to drought stress tolerance strategies. These results also could be important to contribute to selection of tolerant genotypes and develop argane tree regeneration programs in regions that suffer from lack of water.
阿甘树因其植物学价值和社会经济价值而成为一种非凡的植物。它是摩洛哥西南部的特有物种，该地区可能会出现长期干旱胁迫。尽管其耐受性通常归因于整株植物的各种机制，但根系在整个适应过程中起着主要作用。我们研究了阿甘树植物在干旱胁迫和恢复过程中水力传导率的变化、根系电解质渗漏以及根系生长情况。我们的研究结果表明，在干旱胁迫处理下，根系水力传导率（Lp）值显著降低。这与根系电解质渗漏的增加有关，表明根系细胞膜受到了损伤。在根系生长方面，尽管根系质量下降，但受胁迫的植物仍能维持其根系伸长。经过短时间的复水后，阿甘树植物在干旱胁迫后的恢复过程中表现出水力传导率增加的趋势，这表明这种根系生理反应可能与干旱胁迫耐受策略密切相关。这些结果对于在缺水地区选择耐受基因型和开展阿甘树再生计划也可能具有重要意义。
