## 1 Introduction  
Plants that grow in a natural environment are continuously threatened by a wide variety of pathogens. These biotic stressors affect crop production and often cause economic losses. As plants lack mobility, they have acquired a range of signal-transduction systems during evolution to effectively mitigate the adverse effects of environmental changes. The faster these signals maneuver, the more likely it is that plants will adapt and resist the incoming stress. The signals reported so far include calcium flow, ROS (reactive oxygen species), electrical signals, etc. [1; 2; 3; 4; 5], which react within seconds or minutes. Plant _glutamate-like receptor_ genes (_GLRs_) are homologous to mammalian _ionotropic glutamate receptors_ genes (_iGluRs_), which trigger electrical and Ca\({}^{2+}\) signal cascades [3; 6]. Plant GLRs are hypothesized to have ligand-binding as well as ion channel activity. GLRs have 20 family members in Arabidopsis [7] and 13 members in rice [8]. There are 13 full-length _GLR_ genes in tomato plants [9]. Importantly, GLRs are involved in the response of plants to biotic stress. For instance, AtGLR3.3 is a vital module of plant immunity against the bacterial pathogen _P. syringae_ pv. tomato DC3000 (_Pst_ DC3000), the Oomycete _Hylaloperonospora arabidopsis_, and the insect _Spodoptera litterorials_[10; 11; 12]. In addition, [PERSON] et al. (2019) reported that GLR3.5 functions in tomato defense against the root-knot nematode (RKN) _Meloidogyne incognita_[13]. Overexpression of radish _GluR_-complementary DNA in Arabidopsis plants enhances resistance to a necrotic fungal pathogen, _B. _cinera_. However, Arabidopsis _gl73.3_ mutants do not demonstrate increased vulnerability to the fungal pathogen in comparison with Col-0. Thus, the role of GLRs in plant immunity against fungal pathogens remains controversial. Plant GLRs are involved in the generation and transmission of electrical signals. The existence of electrical signals in plants was discovered by [PERSON] and [PERSON] [14; 15]. They are a rapid-response signals generated by the instantaneous change in the electric potential gradient on the plasma membrane or alveolar leaf membrane [16]. All plants can produce long-distance electrical signals, which play a role in the communication of diverse tissues and organs, leading to the integration of environmental responses [17; 18]. In recent years, the function of electrical signals in GLR-mediated plant resistance to biotic stress has attracted much attention [19]. In Arabidopsis, insects feeding on leaves can cause changes in the surface potential, which lead to the expression of several key jasmonate (JA)-inducible regulatory genes in the adult phase of plants [3]. Root-knot nematode attack on tomato roots causes the transfer of electrical and ROS signals from roots to leaves, resulting in an accumulation of JAs in leaves [13]. [PERSON] et al. (2014) proposed a hypothesis that distal JA synthesis in plants upon wounding was dependent on clade 3 GLR-mediated electrical signals [20]. However, the relationship between electrical signals and GLR-induced plant immunity against fungal pathogens has not been fully substantiated. The tomato (_Solanum Lyopersicum_ L.) ranks as one of the world's most significant cultivated crops in terms of economic importance [21]. Nonetheless, fungal diseases have a negative impact on tomato production, resulting in substantial economic losses [22]. In particular, _Botrytis cinerea_, a typical necrotic fungus, has been considered to be in second place in the top 10 fungal pathogens in molecular plant pathology [23]. It has a wide host range and can infect over 200 plant species, including a variety of cash crops [24]. _B. cinerea_ can cause a significant decline in tomato yield and post-harvest fruit quality [25]. However, a tomato variety with broad resistance to _B. cinerea_ has not been developed yet. Thus, understanding the molecular mechanisms of tomato resistance to _B. cinerea_ is particularly important.