ABA (C15) biosynthesis takes place in chloroplasts and cytosol from C40 precursor

ABA closes stomata in response to water stress

ABA promotes root growth and inhibits shoot growth at low water potentials

TLS Online TPP Program

#Id: 6576

#Unit 7. System Physiology – Animal

SRY is a DNA-binding regulatory Protein, bends the DNA & acts as a transcription factor that initiates transcription of a cascade of genes necessary for testicular differentiation

TLS Online TPP Program

#Id: 6577

#Unit 7. System Physiology – Animal

When the embryo has functional testes, Leydig cells of the fetal testis secrete testosterone, and the Sertoli cells secrete MIS (MRF)

TLS Online TPP Program

#Id: 6578

#Unit 7. System Physiology – Animal

MIS is a 536-amino-acid homodimer a member of the TGF-β superfamily

TLS Online TPP Program

#Id: 6579

#Unit 7. System Physiology – Animal

MIS causes regression of the müllerian ducts

TLS Online TPP Program

#Id: 6580

#Unit 7. System Physiology – Animal

The walls of the seminiferous tubules are lined by primitive germ cells and Sertoli cells, large, complex glycogen- containing cells that stretch from the basal lamina of the tubule to the lumen

TLS Online TPP Program

#Id: 6581

#Unit 7. System Physiology – Animal

Tight junctions between adjacent Sertoli cells near the basal lamina form a blood–testis barrier