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GROWTH AND IONS (Na+,
K+ AND Cl-) ACCUMULATING PATTERN OF SOME
BRASSICA GENOTYPES
UNDER
SALINE – SODIC FIELD CONDITION
MUHAMMAD UBAIDULLAH
SHIRAZI1*, MUHAMMAD TAHIR RAJPUT2,
MUHAMMAD ATHAR KHAN1, MUHAMMAD ALI1, SHAIKH M.
MUJTABA1, AISHA SHEREEN1, SABA MUMTAZ1
AND MUKHTIAR ALI3
Abstract:
The growth and ionic
uptake pattern of some Brassica genotypes i.e., Rainbow, Wester,
Durr-e-NIFA, Abaseen 95 (Brassica napus) and NIFA raya (Brassica
juncea) under saline-sodic field conditions was studied.
Two sets of experiments on
normal and saline-sodic site were
conducted at NIA experimental farm, Tandojam, Pakistan during
Rabi 2006-07. The salinity of
the experimental site ranged between 11.0–22.9 dS/m and the pH was
alkaline (8-8.6).
The dominant cation was sodium (Na). The growth performance was recorded
at the time of crop harvest in terms of plant height, grain weight /
plant, grain yield and 100 grain weight. It was observed that the
performance of Wester was better followed by NIFA- raya. The ionic
uptake pattern, of leaves, stem and roots showed that the accumulation
of Na was less in leaf as compared to stem and roots. However, the
genotypes having better performance were found to have accumulating type
of behavior showing comparatively higher Na contents in all plant parts
than other genotypes. This suggests that these genotypes might adjust
their osmotic potential through the accumulation of sodium in vacuole.
On the other hand trend in case of K accumulation was reverse i.e. high
in leaves and stem as compared to roots. Higher accumulating pattern of
K in leaves might be helpful for reducing the toxic effects of sodium.
However, no correlation was observed between K-Na selectivity or K/Na
ratio among the genotypes tested. It is therefore concluded that better
selective mechanism for Na uptake and strict control of intercellular Na
influx for cellular osmotic adjustment could be selected for saline
environment.
1Nuclear Institute of Agriculture (NIA), Tandojam,
Pakistan
2Institute of Plant Sciences,University of Sindh,Jamshor, Pakistan
3Nuclear Institute of Food and Agriculture, Peshawar, Pakistan
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