EFFECT OF SOME GROWTH REGULATORS ON FLOWERS ABSCISSION AND YIELD OF FABA BEAN (Vicia faba L.) PLANT

doi:10.21608/bces.2008.431577

EFFECT OF SOME GROWTH REGULATORS ON FLOWERS ABSCISSION AND YIELD OF FABA BEAN (Vicia faba L.) PLANT

Document Type : Original Article

10.21608/bces.2008.431577

Abstract

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.

Keywords