G protein coupled receptor contains seven membrane-spanning α helices & heterotrimeric G protein.

TLS Online TPP Program

#Id: 9784

#Unit 6. System Physiology – Plant

The NBS–LRR receptor remains inactive when bound to the guardee. However, when the effector interacts with the guardee, the NBS– LRR receptor becomes activated, triggering a signaling cascade that leads to the defense response.

TLS Online TPP Program

#Id: 9785

#Unit 6. System Physiology – Plant

R gene Mi-1 confers resistance to aphids and whiteflies

Rice R gene Bph14 confers resistance to the brown plant hopper

Melon R gene Vat confers resistance to the cotton aphid. 

All of these R genes encode NBS–LRR receptors.

TLS Online TPP Program

#Id: 9786

#Unit 6. System Physiology – Plant

Tomato Cf genes is also encodes a R proteins that recognize apoplastic effectors are receptor‐like proteins (RLPs) against the extracellular colonizing fungus Cladosporium fulvum for Avr9

TLS Online TPP Program

#Id: 9787

#Unit 6. System Physiology – Plant

Lr34 of wheat, maize Rp1 locus, Xa21 in rice and tomato Pto gene are R genes

TLS Online TPP Program

#Id: 9788

#Unit 6. System Physiology – Plant

Mutations in the EDS1 (SA synthesis) (ENHANCED DISEASE SENSITIVITY 1) gene eliminate race‐specific resistance mediated by the TIR‐NB‐LRR class of R proteins

TLS Online TPP Program

#Id: 9482

#Unit 6. System Physiology – Plant

Four major pathogens infects plants most frequently

1. Viruses

2. Bacteria

3. Fungi

4. Insects