Algal amendment improved yield and grain quality of rice with alleviation of the impacts of salt stress and water stress

Abstract

The hazardous effect of abiotic stress and the beneficial effect of organic amendments on rice have been extensively studied during the vegetative stage, but little information is available regarding rice yield. Therefore, the response of rice yield to abiotic stress × organic amendment interaction needs thorough investigation. The differential potency of aqueous extract and biomass of the seaweed Dictyota dichotoma in alleviation of NaCl salinity and PEG-6000 water stress, at Ψ w of -0.492 MPa in medium-textured soil, on yield of cv. Sakha 101 of Oryza sativa was investigated. Grain yield, number of spikes/plant, number of grains/spike, and seed index were lowered by 59%, 47%, 40%, and 35%, respectively under salt-stress with relatively severe reductions of 63%, 50%, 50%, and 40%, respectively under water stress. Also, the improvement in grain yield, number of spikes/plant, number of grains/spike and seed index by algal amendment was greater with algal extract (106%, 72%, 79%, and 81%, respectively) than algal powder (71%, 52%, 46%, and 65%, respectively). The improved grain yield of algal-amended plants was paralleled with the production of wider, heavier and drier grains. Both salinity stress and water stress significantly reduced grain protein but increased soluble sugars and starch contents. The grain content of protein, K + , Ca 2+ , P and N was improved while that of Na + was reduced in response to algal amendment with marginal effects on soluble sugars and starch. Rice grain vigor was positively correlated to protein and mineral nutrient contents versus negative correlation with soluble sugar and starch contents. Both algal amendment and abiotic stress agreed in reducing grain As content. The benefit afforded by Dictyota dichotoma to rice yield justifies manipulation of the algal extract for alleviation of abiotic stress on rice yield and improvement of grain quality.

New biological phytosanitary treatment for strawberry culture: Fortuna variety

“…BM Extra increases the production of flowering hormones, leading to better early fruit development and fruiting. Other studies have confirmed the effectiveness of applying technology based on the use of algae extracts on barley and rice by improving yield and grain quality [14,15]. A biostimulant containing GA142 improved the percentage and degree of blueberry rooting [16].…”

Brown seaweed: Fucus vesiculosus as a feedstock for agriculture and environment protection

“…This effect was explained by the chemical composition of Undaria biomass, i.e., the presence of plant nutrients such as minerals, vitamins, and phytohormones—cytokinin, gibberellin, and auxin 35 . As shown in the research of El-Katony et al, brown seaweed Dictyota dichotoma used as an organic soil amendment improved the rice ( Oryza sativa ) productivity by enriching the soil with plant macro- and microelements and bioactive compounds (e.g., growth hormones, vitamins, phenolics, flavonoids, fucoidan), increasing the plant resistance to the abiotic stress (salt and water stress) as well as improving the soil structure and capacity to hold the nutrients and water 36 , 37 . Possinger and Amador obtained equivalent or improved yield and quality of sweet corn ( Zea mays ) after adding seaweed dried biomass in two contents: ~ 10,910 kg/dry weight/ha and ~ 21,820 kg dry weight/ha, as compared to preformulated organic fertilizer treatment.…”

Roles of salicylic acid in selenium-enhanced salt tolerance in tomato plants

“…It not only acts as an osmoprotectant to regulate the water balance of plant cells, but also plays important roles in ROS scavenging and stabilizing membranes to prevent electrolyte leakage(Shamsul et al, 2012;Naliwajski et al, 2021). Previous studies reported that the soluble sugar and proline content was evidently enriched when plants are subjected to salt stress, which might contribute to the osmotic and salt stress tolerance of plants(Boriboonkaset et al, 2013;El-Katony et al, 2021), while other studies reported opposite or inconsistent results. For example,Watanabe et al (2000) reported that the total soluble sugar content increased in young Populus euphratica leaves but decreased in the mature leaves after salt stress treatment.…”