The shedding of plant organs is a highly coordinated process essential for both vegetative and Research with model plants, namely floral organ abscission in Arabidopsis and leaf, flower and fruit abscission of tomato, and seed shattering in rice has provided new insights in to the molecular mechanisms underlying abscission. However, little is known about how these mechanisms that take place in ...

Changes in freezing injury percentage, lipid peroxidation (malonaldehyde formation), antioxidant enzymes activity and proline content were monitored in the leaves of olive cvs. ‘Fishomi’ and ‘Roughani’ under diff erent freezing temperatures (-5, -10, -15 and -20°C for 10 h). Th e results showed that freezing injury (determined by electrolyte leakage analysis) and malonaldehyde (MDA) content of ...

Apple (Malus × domestica) represents an interesting model tree crop for studying fruit abscission. The physiological fruitlet drop occurring in this species can be easily magnified by using thinning chemicals, such as benzyladenine (BA), to obtain fruits with improved quality and marketability. Despite the economic importance of this process, the molecular determinants of apple fruitlet absciss...

Whole plant defoliation studies were performed using dark red kidney bean (Phaseolus vulgarisL.) to compare the effect of cyclanilide [1(2,4-dichlorophenylaminocarbonyl)-cyclopropane carboxylic acid], ethephon (2-chloroethylphosphonic acid), auxin transport inhibitors, and temperature on leaf abscission. Ethephon induced bean leaf defoliation, but ethephon combinedwith cyclanilide induced great...

This study explores the relationship between endogenous ethylene levels in stress-induced fruit abscission in different cotton cultivars. The plants were exposed to soil waterlogging or high temperature (45C) stress during early reproductive phase. Ethylene synthesis was also modified using chemical ethylene regulators e.g. aminoethoxyvinylglycine (AVG) and 1-aminocyclopropane-1-carboxlic acid ...

A ligand-receptor module comprised of the peptide INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) and the receptor-like kinases HAESA (HAE) and HAESA-LIKE2 (HSL2) activates organ abscission in Arabidopsis flowers. Another set of receptor-like kinases, including EVERSHED (EVR), restricts the extent of cell separation in abscission zones by potentially altering HAE/HSL2 localization or activity. The ...

Two structurally divergent endo-p-l,Cglucanase (EGase) cDNAs were cloned from tomato. Although both cDNAs (Cell and Ce12) encode potentially glycosylated, basic proteins of 51 to 53 kD and possess multiple amino acid domains conserved in both plant and microbial EGases, Cell and Ce12 exhibit only 50% amino acid identity at the overall sequence level. Amino acid sequence comparisons to other pla...

Six cellulase genes were isolated from total RNA of the ethylene-treated tomato (Lycopersicon esculentum Mill.) flower abscission zone by reverse-transcription polymerase chain reaction using degenerate primers to conserved amino acid sequences from known plant cellulases. Four of the gene fragments are homologous to fruit pericarp cellulases. The other two are novel cellulase genes, referred t...

in order to prevent of inflorescence bud abscission and reduce of alternate bearing in pistachio cv. ‘ohadi’ an experiment with 12 treatments including of girdling, fruit thinning, application of urea (0.5%), sucrose (3 and 5%) and their combination with urea, zinc sulfate (0.05 and 0.1% of pure zinc) and also their combination with urea in 3 replication and during 2 stages, was conducted in 20...

As apples ripen they begin to produce large amounts of the ripening hormone, ethylene. Ethylene stimulates fruit softening and the formation of an abscission zone in the stem. Ethylene stimulates the production of enzymes (cellulase and polyglacturonase) that break down the cell walls and the glue that holds cell walls together in the abscission zone of the stem, leaving the fruit connected to ...