Abstract
Priming can improve plant innate capability to deal with the stresses caused by both biotic and abiotic factors. In this study, the effect of DL-β-amino-n-butyric acid (BABA) against Aphis glycines Matsumura, the soybean aphid (SA) was evaluated. We found that 25 mM BABA as a root drench had minimal adverse impact on plant growth and also efficiently protected soybean from SA infestation. In both choice and non-choice tests, SA number was significantly decreased to a low level in soybean seedlings drenched with 25 mM BABA compared to the control counterparts. BABA treatment resulted in a significant increase in the activities of several defense enzymes, such as phenylalanine ammonia-lyase (PAL), peroxidase (POX), polyphenol oxidase (PPO), chitinase (CHI), and β-1, 3-glucanase (GLU) in soybean seedlings attacked by aphid. Meanwhile, the induction of 15 defense-related genes by aphid, such as AOS, CHS, MMP2, NPR1-1, NPR1-2, and PR genes, were significantly augmented in BABA-treated soybean seedlings. Our study suggest that BABA application is a promising way to enhance soybean resistance against SA.
Highlights
Plants are able to protect themselves against attack by pathogens and pests through constitutive and inducible defense mechanisms, such as rapid synthesis of toxic metabolites and defensive proteins
In the b-amino-n-butyric acid (BABA) concentration optimization experiment, we found BABA inhibited the growth of soybean seedlings in a concentration-dependent manner and distinguished the DI according to the symptoms of the first pair of primary leaves and the first trifoliolate leaves
To minimize the adverse impact of BABA when using as an agent against soybean aphid, the biological effects of this chemical
Summary
Plants are able to protect themselves against attack by pathogens and pests through constitutive and inducible defense mechanisms, such as rapid synthesis of toxic metabolites and defensive proteins. Plant resistance will be elevated and plants acquire enhanced protection against future pathogen attack, a phenomenon known as induced resistance. Such induced defenses are generally recognized to impose a resource cost on the plant, manifested as reduced growth and reproductive fitness [1]. BABA, a non-protein amino acid, can induce plants into a sensitization state in which defenses are not expressed, but in which plants are able to respond more rapidly and/or more strongly to attack than other plants that have not experienced previous stress. Priming offers effective and economic protection against plant diseases, especially in the area with relatively high disease pressure [4]
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