Effect of some growth regulators on flowers abscission and yield of faba bean (viciafaba l.)‎ Plant

Abstract EN

Pot experiments were conducted in the green house, Faculty of Agriculture, Ain Shams University during the two successive seasons of 2005-2006 and 2006- 2007.

Paclobutrazol (PP333) at 25, 50 ppm, naphthalene acetic acid (NAA) at 20, 40 ppm, CPPU (N-(2- chloro-4-pyridyl)-N- phenylurea) and salicylic acid (SA)at 10, 20 ppm each in addition to distilled water as control were applied as foliar spray at 60 and 75 days after sowing.

Two samples were taken at 90 days after sowing and at harvest (180 days after sowing).

Application of PP333 at 50 ppm reduced plant height and at both concentrations gave an increase in branches and leaves number.

Application of NAA showed the lowest number of branches.

Application of PP333 at 25 and 50 ppm gave marked increase in flowers number.

Significant increase in flowers number was obtained by CPPU treatments and NAA at 40 ppm.

CPPU and NAA treatments reduced flowers and immature pods abscission percentage.

Significant increase in pods number/plant was obtained by PP333, CPPU and NAA treatments.

The highest values of 100 seeds weight were obtained by NAA treatments.

The best results of seeds weight/plant were recorded by PP333 at 50 ppm and NAA at 40 ppm in both seasons.

Applications of NAA resulted in high concentrations of endogenous auxin in leaves and total soluble carbohydrates in leaves and seeds.

PP333 treatments gave an increase in total soluble carbohydrates and proteins in leaves.

CPPU treatments showed the highest values of total soluble proteins in leaves.