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Silicon attenuates abiotic stress caused by ammonium toxicity but not nitrogen deficiency in cotton plants
Author(s) -
Leal Aguinaldo José Freitas,
Barreto Rafael Ferreira,
Mello Prado Renato,
Silva Junior Gabriel Barbosa,
Barreto Cláudio Ferreira,
Santos Luiz Cláudio Nascimento dos,
Campos Cid Naudi Silva
Publication year - 2021
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/jac.12499
Subject(s) - shoot , toxicity , ammonium , abiotic component , nitrogen , chemistry , nutrient , horticulture , abiotic stress , dry weight , zoology , agronomy , biology , biochemistry , ecology , organic chemistry , gene
Although N - NO 3 ‐ predominates in many soils, compared to N - NH 4 + , the fluctuations in the forms and concentrations of N can expose to N deficiency in plants in general and NH 4 + toxicity in NH 4 + sensitive plants. However, a strategy to mitigate nutritional disorders of N is to utilize Si. We aimed to verify if Si attenuates N deficiency and NH 4 + toxicity in cotton plants grown in nutrient solution. The treatments followed a 5 × 2 factorial scheme, with five concentrations of NH 4 + (1.0; 7.5; 15.0; 22.5 and 30.0 mmol/L) combined with the absence and presence of Si (1 mmol/L), arranged in a completely randomized design with four replications. Without Si, the largest shoot dry mass occurred at 16 mmol/L NH 4 + , increased by 47%, compared to 1 mmol/L NH 4 + and decreased by 37% compared to 30 mmol/L NH 4 + . With Si, the largest shoot dry mass was observed at 20 mmol/L NH 4 + , increased by 52% compared to 1 mmol/L NH 4 + and decreased by 14% compared to 30 mmol/L NH 4 + . In addition, in the highest concentration of NH 4 + , plants with Si exhibited a higher shoot dry mass relative to plants with no Si supplementation due to decreased electrolyte leakage index and increased use efficiency of N and K. Cotton plants were tolerant to high NH 4 + concentrations (≈15 mmol/L). Si attenuates abiotic stress caused by NH 4 + toxicity (30 mmol/L) but not N deficiency in cotton plants.