BIOGEOGRAPHIC CLASSIFICATION OF INDIA

Our country can be conveniently divided into ten major regions, based on the geography, climate and pattern of vegetation seen and the communities of mammals, birds, reptiles, amphibia, insects and other invertebrates that live in them.

TLS Online TPP Program

#Id: 10255

#Unit 6. System Physiology – Plant

The synthesis of Group 3 D‐7 family* LEA proteins, storage proteins, and lipids is promoted by ABA

TLS Online TPP Program

#Id: 10256

#Unit 6. System Physiology – Plant

Precocious germination in the ABA-deficient vp14 mutant of maize. The VP14 protein catalyzes the cleavage of 9-cis-epoxycarotenoids to form xanthoxal, a precursor of ABA. 

TLS Online TPP Program

#Id: 10257

#Unit 6. System Physiology – Plant

when seed abscisic acid (ABA) content is highest 

Accumulation of disaccharides and oligosaccharides

Synthesis of storage proteins

Synthesis of late-embryogenesis-abundant (LEA) proteins

Synthesis of small heat shock proteins (smHSPs)

Activation of antioxidative defenses

Changes in the physical structure of cells

Gradual increase in cell density

TLS Online TPP Program

#Id: 10258

#Unit 6. System Physiology – Plant

ABA is transported by both the xylem and the phloem, but it is normally much more abundant in the phloem sap

TLS Online TPP Program

#Id: 10259

#Unit 6. System Physiology – Plant

ABA synthesized in the roots can also be transported to the shoot via the xylem. The concentration of ABA in the xylem sap of well-watered sunflower plants is between 1.0 and 15.0 nM, the ABA concentration in water stressed sunflower plants increases to as much as 3000 Nm (3.0 μM)

TLS Online TPP Program

#Id: 10260

#Unit 6. System Physiology – Plant

As the soil dried out, the water potential of the leaf decreased, and the ABA content and stomatal resistance increased. The process was reversed by rewatering.