Morpho-physiological screening for salinity tolerant genotypes in wheat [Triticum aestivum (L.)]
Abstract
The present study was conducted with 14 wheat genotypes {P-9109, P-9110, P-9111, P-9112,
P-9113, P-9114, P-9115, P-9116, P-9117, P-9118, P-9119, P-9120, Kh-65, KRL-210 (Check)}to
evaluate physiological and biochemical for lab condition and physiological, biochemical and yield
related attributes for salinity tolerance in field conditions. For lab condition Seedlings of uniform size
were selected and planted on germination paper were supplied with half strength of Hoagland nutrient
solution alongwith 5 dSm-1 and 7.5 dSm-1 saline water in the beaker and seedling were grown for 14
and 21 days. Root length and shoot length decreased with increasing level of salinity among all
genotypes under lab condition (14 & 21 days after germination). Root biomass and shoot biomass also
decreased with increasing level of salinity among all genotypes under lab condition (14 & 21 days after
germination). Salinity had deleterious effect in all the genotypes of wheat plants and due to the adverse
effect of salinity on membrane injury and MDA content of the leaves which increased significantly
from their respective control treatment in field (10 & 20 days after anthesis) as well as in lab conditions
(14 & 21 days after germination). Chlorophyll a, chlorophyll b, total chlorophyll content, carotenoid
content and chlorophyll stability index decreased significantly with gradual increase in salinity levels in
all the genotypes under field and lab conditions. Plant height and plant biomass also decreased with
increasing level of salinity among all genotypes under field conditions. Grain weight/m2 and 1000 grain
weight also decreased with increasing levels of salinity in all genotypes under field conditions.
Minimum salt susceptibility index was observed in Kh-65 & KRL-210 and maximum salt susceptibility
index was observed in genotype P-9118 & P-9119. Therefore, it is concluded that KRL-210 and Kh-
65(check) are the most resistant towards salinity followed by P-9117 whereas genotypes P-9118 and P-
9119 are the most susceptible genotypes.
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