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COMPARATIVE SALINITY
RESPONSES AMONG TOMATO GENOTYPES AND
ROOTSTOCKS
GOLGEN
BAHAR OZTEKIN* AND YUKSEL TUZEL
Abstract:
Salinity is a
major constraint limiting agricultural crop productivity in the world.
However, plant species and cultivars differ greatly in their response to
salinity. This study was conducted in a greenhouse to determine the
response of 4 commercial tomato rootstocks, 21 cultivars and 8 candidate
varieties to salinity stress. Seeds were germinated in peat and when the
plants were at the fifth-true leaf stage, salt treatment was initiated
except control treatment. NaCl was added to nutrient solution daily with
25 mM concentration and had been reached to 200mM final concentration.
On harvest day, genotypes were classified based on the severity of leaf
symptoms caused by NaCl treatment. After symptom scoring, the plants
were harvested and leaf number, root length, stem length and diameter
per plant were measured. The plants were separated into shoots and roots
for dry matter production. Our results showed that, on average, NaCl
stress decreased all parameters and the rootstocks gave the highest
performance than genotypes. Among all rootstocks, three varieties (819,
2211 and 2275) and ten genotypes (Astona, Astona RN, Caracas, Deniz,
Durinta, Export, Gökçe, Target, Yeni Talya and 144 HY) were selected as
tolerant with slight chlorosis whereas the genotype Malike was selected
as sensitive with severe chlorosis. Candidate varieties 2316 and 1482
were the most sensitive ones. Plant growth and dry matter production
differed among the tested genotypes. However no correlation was found
between plant growth and dry matter production. Rootstock Beaufort gave
the highest shoot dry matter although Heman had highest root dry matter.
Newton showed more shoot and root dry matter than other genotypes. It is
concluded that screening of genotypes based on severity of symptoms at
early stage of development and their dry matter production could be used
as a tool to indicate genotypic variation to salt stress.
Ege University, Faculty
of Agriculture, Department of Horticulture, 35100, Bornova-Izmir, Turkey
*Corresponding
author, E-mail:
golgen.oztekin@ege.edu.tr, Tel/Fax:+90 232 3881865
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