INVESTIGATION S O N TH E EFFECT S O F WATE R STRES S O N METABOLI C ALTERATION S I N PIGEONPE A ( Cajanus cajan (L.) Millspaugh ) GENOTYPE S
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Date
1991
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MPKV, UNIVERSITY LIBRARY RAHURI
Abstract
Investigations were undertaken to identify some
biochemical markers for stress tolerance of pigeonpea genotypes
by quantifying some metabolic alterations during the water
stress. The nitrogen fixing ability of the pigeonpea genotypes
under water stress conditions was assessed by estimating
leghaemoglobin (haemin) content of nodules and their drought
tolerance examined by estimating the contents of proline- and
carbohydrates.
J?ive promising pigeonpea genotypes viz., TAT-10,
ICPL-151, ICPL-87, TVishakha-1 and BDN-1, grown on Vertisol
in pots, were subjected to increasing water stress at V?th
day of crop growth by withholding irrigation for *+, 8 and 12
days under the glasshouse conditions. The metabolic
alterations were monitored and compared with the unstressed
control.
The changes in soil moisture, leaf in vivo nitrate
reductase activity, free proline content, nodule number,
leghaemoglobin (haemin) and total nitrogen in plants,available
nitrogen in soil, total phenols and carbohydrates in plants
during the water stress were determined and compared with the
unstressed control.
The results indicated an apparent decrease in leaf
in vivo nitrate reductase activity, nodule number, the contents
of leghaemoglobin (haemin), total nitrogen in plants and
available nitrogen of soil under the water stress. However,
the water stress significantly increased the contents of free
proline in the leaves, total phenols and carbohydrates in the
plants of all the five pigeonpea genotypes. The nodule number
and haemin content of nodules as well as the proline and total
nitrogen contents of pigeonpea cultivars appeared to be closely
related with each other under the water stress conditions.
The results of the present study revealed that among
the pigeonpea cultivars studied, BDlv-1 exhibited higher
nitrogen fixing ability under the water stress conditions,
followed by TVishakha-1 and ICPL-87, based on the retention of
haemin content of nodules. However, on the basis of percent
increase in accumulation of proline in leaves and carbohydrates
in plants over the unstressed control, the cultivar TAT-10
appeared to be more drought tolerant than other cultivars.
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