Fuzzy synthetic evaluation of the impact of plant growth regulators on the root phenotype traits of rice seedlings under thiocyanate stress

Application of plant growth regulators (PGRs) is a novel strategy for allay of the adverse effects caused by biotic/abiotic stresses. However, no studies have vividly executed mathematic evaluation for the assessment of various PGRs on root phenotype traits (RPTs) against pollutants. In the present study, a microcosm hydroponic experiment was conducted to examine responses of RPTs under SCN- (0, 24, 96, and 300 mg SCN/L) stress in the presence of PGRs such as jasmonic acid (JA), indole-3-acetic acid (IAA), and sodium hydrosulfide (NaHS) in rice plants. Fuzzy synthetic evaluation was applied to determine the outcome of the effects of various PGRs on the RPTs under SCN- exposure. Root scanning results indicated that exogenous IAA and NaHS has the greater potential for improving the RPTs of rice seedlings under SCN - stress, while JA failed to uplift the RPTs in response to SCN- stress. Fuzzy synthetic evaluation indicated that in control plants (without SCN ), the effect of three PGRs applied on the RPTs is as follows: NaHS > IAA > JA. At 24 mg SCN/L, NaHS and IAA had consistent actuate in regulating RPTs of rice seedlings, while all PGRs amended have an affirmative impact on RPTs at 96 and 300 mg SCN/L. The present research highlights the utilization of contemporary mathematic method to screen the superior species of PGRs through the RPTs test of plants under pollutant belt.

Automated summary

The study found that exogenous IAA and NaHS have a greater potential for improving root phenotype traits of rice seedlings under SCN- stress, while JA failed to uplift these traits. Fuzzy synthetic evaluation revealed that in control plants, the effects of three PGRs on root phenotype traits are as follows: NaHS > IAA > JA, and under SCN- exposure, NaHS and IAA consistently regulated root phenotype traits of rice seedlings, with all PGRs showing a positive impact at 96 and 300 mg SCN/L.