Seaweeds are acknowledged for their potential as biofertilizers and biostimulants, contributing to enhanced growth and yield of various crops globally due to their appropriate amount of macro- and microelements, plant growth regulators, and their richness in bioactive compounds. In the current study, the seaweeds Ulva lactuca, Ulva intestinalis, Corallina officinalis, Ellisolandia elongata, Jania rubens, Colpomenia sinuosa, and the newly recorded red alga Phyllymenia gibbesii were collected from the eastern coast of Alexandria, Egypt (Mediterranean Sea) from April 2015 until June 2016 and were evaluated as biofertilizers to enhance the growth and yield of potato cultivars (cv. Hermes and cv. Bellini). The chemical contents of macroelements (Ca, Na, N, P, and K) and the microelements (Zn, Cu, Ni, Cd, Co, Pb, and Fe) were determined in the dry seaweed powder and its water extracts. For short-term use of SWEs, the results showed that all the measured microelements and Na in seaweed extracts were below the permissible levels according to FAO/WHO. For long-term use of SWEs, the Co concentration exceeded the permissible level in all SWEs according to FAO/WHO. The same pattern was observed for Cd, except for C. officinalis and P. gibbesii. The concentration of Cu and Ni exceeded the permissible levels in U. intestinalis and C. officinalis (0.28 and 0.36 mg L−1), respectively, for Cu and (0.41 and 0.31 mg L−1), respectively, for Ni. For the analyses of carbohydrates and protein in seaweeds, P. gibbesii had the highest concentration of carbohydrates (56.2 ± 3.8%), followed by U. lactuca (53.6 ± 5.1%), while the protein content showed the inverse pattern. The growth-regulating hormones (IAA, Kinetin, GA3, and ABA) were quantified in the seaweeds. Ulva lactuca had the highest concentrations of (IAA, GA3, and ABA) (1 µg g−1 FW, 0.12 µg g−1 FW, and 0.006 µg g−1 FW), respectively. The highest concentration of kinetin occurred in C. sinuosa (0.168 µg g−1 FW). In the greenhouse experiment, the seaweed extracts were applied (autoclaved and non-autoclaved) to evaluate their effects on the potato cultivars. The algal extracts, particularly C. sinuosa, U. lactuca, and P. gibbesii, were promising for potato growth and yield parameters for both cultivars. Due to the high concentrations of some microelements in seaweed extracts, which exceeded the permissible levels for long-term use according to FAO/WHO, they are recommended to be used only for short-term irrigation.

Evaluation of the newly recorded alga Phyllymenia gibbesii compared with six Egyptian native species as biofertilizers to enhance growth and yield of potato cultivars

期刊论文
出版模式：

开放获取
发表日期：

2025年7月10日

查看全文

Sayed S. Aboshosha,
Nader A. Ashmawy,
Nihal G. Shams El-Din,
Mai M. A. Abd El-Ghany

摘要

Seaweeds are acknowledged for their potential as biofertilizers and biostimulants, contributing to enhanced growth and yield of various crops globally due to their appropriate amount of macro- and microelements, plant growth regulators, and their richness in bioactive compounds. In the current study, the seaweeds Ulva lactuca, Ulva intestinalis, Corallina officinalis, Ellisolandia elongata, Jania rubens, Colpomenia sinuosa, and the newly recorded red alga Phyllymenia gibbesii were collected from the eastern coast of Alexandria, Egypt (Mediterranean Sea) from April 2015 until June 2016 and were evaluated as biofertilizers to enhance the growth and yield of potato cultivars (cv. Hermes and cv. Bellini). The chemical contents of macroelements (Ca, Na, N, P, and K) and the microelements (Zn, Cu, Ni, Cd, Co, Pb, and Fe) were determined in the dry seaweed powder and its water extracts. For short-term use of SWEs, the results showed that all the measured microelements and Na in seaweed extracts were below the permissible levels according to FAO/WHO. For long-term use of SWEs, the Co concentration exceeded the permissible level in all SWEs according to FAO/WHO. The same pattern was observed for Cd, except for C. officinalis and P. gibbesii. The concentration of Cu and Ni exceeded the permissible levels in U. intestinalis and C. officinalis (0.28 and 0.36 mg L⁻¹), respectively, for Cu and (0.41 and 0.31 mg L⁻¹), respectively, for Ni. For the analyses of carbohydrates and protein in seaweeds, P. gibbesii had the highest concentration of carbohydrates (56.2 ± 3.8%), followed by U. lactuca (53.6 ± 5.1%), while the protein content showed the inverse pattern. The growth-regulating hormones (IAA, Kinetin, GA₃, and ABA) were quantified in the seaweeds. Ulva lactuca had the highest concentrations of (IAA, GA₃, and ABA) (1 µg g⁻¹ FW, 0.12 µg g⁻¹ FW, and 0.006 µg g⁻¹ FW), respectively. The highest concentration of kinetin occurred in C. sinuosa (0.168 µg g⁻¹ FW). In the greenhouse experiment, the seaweed extracts were applied (autoclaved and non-autoclaved) to evaluate their effects on the potato cultivars. The algal extracts, particularly C. sinuosa, U. lactuca, and P. gibbesii, were promising for potato growth and yield parameters for both cultivars. Due to the high concentrations of some microelements in seaweed extracts, which exceeded the permissible levels for long-term use according to FAO/WHO, they are recommended to be used only for short-term irrigation.