Seaweed extract to enhance marigold seed germination and seedling establishment
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Seaweed extract to enhance marigold seed germination and seedling establishment Armando Reis Tavares1 · Patrick Luan F. dos Santos2 · Alessandro Reinaldo Zabotto2 · Matheus Vinícios L. do Nascimento2 · Half W C. Jordão2 · Roberto Lyra Villas Boas2 · Fernando Broetto2 Received: 18 March 2020 / Accepted: 28 September 2020 © Springer Nature Switzerland AG 2020
Abstract The brown seaweed Ascophyllum nodosum and seaweed-derived products have been widely used as nutrient additions, biofertilizer and biostimulant in horticultural crop systems. This study aimed to evaluate the effects of a seaweed extract obtained from whole brown algae (A nodosum) on seed germination and seedling growth of ornamental marigold (Tagetes erecta). The seeds of marigold were daily sprayed with 0 (control), 5, 10 or 15 mL L−1 commercial seaweed extract Acadian Seaplants™ (70 ml). The percentage, index and average time of seed germination, seedling height, fresh, dry mass of shoots, roots and root system morphology were evaluated. The results showed that the seaweed extract enhanced all parameters related to seed germination and seedling growth and development. The best results were obtained with 15 mL L−1 seaweed extract which increased by two-fold marigold seed germination and 84.00% seedling height, and both fresh and dry shoot mass and root morphology. We suggest algal extracts of Ascophyllum nodosum should be used as natural biostimulant on marigold crop, improving seed germination and seedling development. Keywords Ascophyllum nodosum · Tagetes erecta · Floriculture root development · Plant growth
1 Introduction The concept of sustainability and sustainable products has become a potential market for many companies and a thematic area of study at many universities. To reduce dependence on synthetic chemicals natural products have been used in Brazilian agriculture as a new method of ensuring the sustainability and production of agriculture yields [1, 2]. Biostimulants, such as Ascophyllum nodosum seaweed extract, are a sustainable alternative to stimulate root growth, seedling development and, at the same time, reduce production costs. However, to maximize biostimulant effects it must be applied correctly [3, 4]. Seaweed extracts are considered as a full-fledged class of agri-inputs and highly attractive business opportunity
once these substances mitigate abiotic stress and improve plant productivity [5]. Brown algae are the most used in agriculture, improving various growth parameters, increased water and nutrient uptake, resistance to abiotic stress, in addition stimulating seed germination [6]. The benefits of seaweed extract as biostimulants range from the sustainable yield production to the improvement of physiological processes in a variety of crops and species. Brazilian floriculture is an innovative and technologically responsive segment to the new trends, especially based on the achievement of farm sustainability [7]. Brazilian ornamental floriculture exports are focused on vegetative propagation, such as seedlings
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