Dominant recessive epistasis (13:3) Pigmentation in paddy rice

P  = purple

              pp=green

              I   =inhibitory gene

              PpIi × PpIi

                       

              P_I_=9  green

              P_ii = 3 purple

              ppI_=3  green

              ppii =1  green

TLS Online TPP Program

#Id: 7106

#Unit 6. System Physiology – Plant

Inhibitors of ethylene action

Most of the effects of ethylene can be antagonized by specific ethylene inhibitors. Silver ions (Ag+) applied as silver nitrate (AgNO3) or as silver thiosulfate (Ag(S2O3)2 3–) are potent inhibitors of ethylene action. Silver is very specific; the inhibition it causes cannot be induced by any other metal ion.

TLS Online TPP Program

#Id: 7107

#Unit 6. System Physiology – Plant

The volatile compound trans-cyclooctene is a strong competitive inhibitor of ethylene binding; trans-cyclooctene is thought to act by competing with ethylene for binding to the receptor. A novel inhibitor, 1-methylcyclopropene (MCP), was recently found that binds almost irreversibly to the ethylene receptor

TLS Online TPP Program

#Id: 7108

#Unit 6. System Physiology – Plant

FLAVR SAVR TOMATO GENES INVOLVED

TLS Online TPP Program

#Id: 7109

#Unit 6. System Physiology – Plant

All fruits that ripen in response to ethylene exhibit a characteristic respiratory rise before the ripening phase called a climacteric.

TLS Online TPP Program

#Id: 7110

#Unit 6. System Physiology – Plant

In banana, ripening is characterized by a climacteric rise in

respiration rate, as evidenced by the increased CO2 production.

A climacteric rise in ethylene production precedes the increase in CO2 production, suggesting that ethylene is the hormone that triggers the ripening process.

TLS Online TPP Program

#Id: 7111

#Unit 6. System Physiology – Plant