تأثير الاجهاد الملحي في بعض مؤشرات النمو لشتلات القرم الرمادي  Avicennia marina (Forsk.) Vierh

Al-Zewar et al.

Authors

Al-Zewar et al. Marine Sciences Center

Keywords:

Gray mangrove, Avicennia marina, bioreactor, vegetative traits, biomass, salt tolerance, chlorophyll content.

Abstract

The experiment was conducted in one of the orchards of Abu Al-Khaseeb district of Basrah Governorate Iraq for a period of 180 days from Nov. 2021 to May 2022, using a tidal bioreactor as a model for environmental conditions on the marine coasts. In the experiment, two-month-old (2m) and 24-month-old (24m) seedlings were used at planting and five salinity levels (5, 15, 25, 35, and 50 ppt) with 6 replicates. Measurements of growth indicators, which recorded the highest values in plants treated with 25 ppt saline concentration, for (24m) seedlings 6 months after the planting, as they reached 76.3 cm, 116.7 leaves.plant-1, 2280 cm2.plant-1, 17.33 branches.plant-1 and 62.4 µg.cm-2 for the indicators of the total height of the plant, the total number of leaves in the plant, the total leaf area, the number of lateral branches, and the total leaf content of chlorophyll, respectively. Recorded the highest value of the total fresh weight in treated plants 50 ppt was 124.81 g, while no large differences were observed in the percentage for the dry matter of the plants and for all the saline treatments, while the plants of the 35 ppt treatment achieved the highest survival rates of 100% for seedlings of (2m) and (24m) after six months of cultivation. The results were compared according to the Least Significant Difference (L.S.D.) test at a probability level of 0.05.

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