El-Sarkassy, NM

Fuller, MP

Sakr, MT

Among the abiotic stresses, salinity is the most destructive factor which limits yield productivity of
many crop plants and/or limitation of marketable yield of several vegetable fruit crops such as sweet
pepper. Exogenously applied protectants are needed to alleviate the effects of salt stress. Two
experiments were carried out to study the effect of salt stress on growth, yield and endogenous bioconstituents on sweet pepper (Capsicum annuum L. cv. Orlando) and to examine whether salinity
stress can be offset by the application of exogenous protectants of some antioxidant and bio-stimulant
compounds. Salinity stress (2, 4 or 6 g l
-1
) decreased growth parameters at 75 days after transplanting
and yield components. Exogenously applied protectants counteracted the harmful effects of low and
moderate salinity stress levels (2 and 4 g l
-1
) and partially counteracted the harmful effects under the
highest salinity stress level (6 g l
-1
). Salinity stress levels increased proline and Na contents but
decreased sugar content, K in shoots and fruits, and photosynthetic pigments in the leaves of pepper
plants. In addition, all of the applied antioxidants alone or combined with different salinity stress
levels slightly increased the content of sugar, K and decreased Na and proline content. Citric, humic
acid, Putrescine, and seaweeds extract (SWE) were the most effective agents in this respect and
ascorbic acid is the best. These results provide support for the field application of antioxidant and biostimulant compounds to alleviate the effects of salty soils

MINIMIZATION THE EFFECTS OF SALT STRESS ON SWEET PEPPER PLANTS BY EXOGENOUS PROTECTANTS APPLICATION

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