The Efficacy of 5-Aminolevulinic Acid-Producing Luteovulum sphaeroides Strains on Saline Soil Fertility, Nutrient Uptakes, and Yield of Rice

Nguyen Quoc Khuong, Nguyen Thi Thuy Dung, Le Thi My Thu, Le Thanh Quang, Ly Ngoc Thanh Xuan and Ngo Thanh Phong ()
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Nguyen Quoc Khuong: Faculty of Crop Science, College of Agriculture, Can Tho University, Can Tho 94115, Vietnam
Nguyen Thi Thuy Dung: Faculty of Crop Science, College of Agriculture, Can Tho University, Can Tho 94115, Vietnam
Le Thi My Thu: Faculty of Crop Science, College of Agriculture, Can Tho University, Can Tho 94115, Vietnam
Le Thanh Quang: Faculty of Crop Science, College of Agriculture, Can Tho University, Can Tho 94115, Vietnam
Ly Ngoc Thanh Xuan: Experimental and Practical Area, An Giang University—Vietnam National University Ho Chi Minh City, Long Xuyen 90116, Vietnam
Ngo Thanh Phong: Department of Biology, College of Natural Sciences, Can Tho University, Can Tho 94115, Vietnam

Agriculture, 2023, vol. 13, issue 9, 1-19

Abstract: Saline soils negatively affect and cause serious problems for rice cultivation. This study aimed to evaluate the efficacy of the purple nonsulfur bacteria (PNSB) capable of secreting 5-aminolevulinic acid (ALA) to reduce soil salinity, improve soil fertility, and enhance rice growth and yield. A two-factorial experiment was conducted in a randomized complete block design with four replications. Factor one was the salinity of the irrigated water, and factor two was the supplementation of the ALA-producing PNSB. The results indicated that watering with saline water above 3‰ led to decreases in plant growth and rice yield compared to the treatments watered with tap water. Application of either an individual strain or the mixture of W01, W14, and W22 ameliorated soil properties and increased total NPK uptake, whereas treatments supplied with the mixed strains reduced total Na uptake (9.50 mg Na pot −1 ). Supplying the W01, W14, and W22 strains individually or in a mixture enhanced the plant height by 3.51–5.45% and rice grain yield by 14.7–26.2%, compared with those of the control treatment. From the study, the combination of the L. sphaeroides W01, W14, and W22 strains is promising for application in saline or salt-contaminated regions to aid the damages caused by salinity on cultivars there, especially rice. Furthermore, this is a biological approach to ease an environmental problem and improve crop performance, which is supposed to be a trend in the sustainable agriculture.

Keywords: 5-aminolevulinic acid; Luteovulum sphaeroides; purple nonsulfur bacteria; rice; saline soil (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
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