HAESA, an Arabidopsis leucine-rich repeat receptor kinase, controls floral organ abscission

Article Abstract:

An Arabidopsis, leucine-rich repeat receptor kinase, LRR-RLK HAESA, once called RLK5, has been found to control floral organ abscission, natural leaf/flower/fruit shedding. HAESA is plasma membrane-associated and has serine-threonine protein kinase activity. To study HAESA transgenic plants that express a constitutive antisense HAESA construct were generated. Abscision of floral organs was scored. Presence of the antisense transgene meant failure to abscise floral organs.

Leucine, Abscission (Botany), Plant cell walls, Cell walls

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Inactivation of AtRac1 by abscisic acid is essential for stomatal closure

Article Abstract:

Study in Arabidopsis of the small guanosine triphosphatase (GTPase) protein AtRac1 and adaptation to drought has shown involvement of Rho-related plant proteins in stoma control. Abscisic acid (ABA) treatment brought on inactivation of AtRac GTPases and disruption of the stoma guard cells' actin cytoskeletons.

Statistical Data Included, Plants, Cytoskeleton, Abscisic acid, Homeostasis, Plant-water relationships, Physiological absorption

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Integrin-linked kinase (ILK) is required for polarizing the epiblast, cell adnesion, and controlling actin accumulation

Article Abstract:

Integrin-linked kinase (ILK) in mammals has been found to be necessary for polarizing the epiblast, cell adhesion, and controlling actin accumulation. A t the peri-implantation stag e, m i ce lacking ILK expression die because they do not polarize the epiblast and cavitate. ILK is a focal adhesion component that interacts with the cytoplasmic domains of integrins. It also recruits adaptor proteins that link integrins to the actin cytoskeleton and phosphorylates serine /th reonine kinases PKB/Akt and GSK-3(be ta).

Germany, Science & research, Cavitation, Cell adhesion, Integrins

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