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EFFECT OF PUTRESCINE AND PACLOBUTRAZOL ON GROWTH, PHYSIOLOGICAL AND BIOCHEMICAL PARAMETERS OF CITRUS ROOTSTOCKS UNDER SALT STRESS

KrishiKosh

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Title EFFECT OF PUTRESCINE AND PACLOBUTRAZOL ON GROWTH, PHYSIOLOGICAL AND BIOCHEMICAL PARAMETERS OF CITRUS ROOTSTOCKS UNDER SALT STRESS
 
Creator DEW KUMARI SHARMA
 
Contributor A.K. Dubey
 
Subject fruits, strawberry (plant), developmental stages, planting, yields, confectionery, biological development, sugar, markets, biological phenomena
 
Description t-8153
The present investigation entitled ‘Effect of putrescine and paclobutrazol on
growth, physiological and biochemical parameters of citrus rootstocks under salt stress’
was conducted under polyhouse in the Division of Fruits and Horticultural Technology,
I.A.R.I. New Delhi during 2008-09. The experiment was conducted with three levels of
paclobutrazol, i.e. 0 ppm (P0-control), 250 ppm (P1) and 500 ppm (P2) and two levels of
putrescine viz., 0 ppm (T0) and 50 ppm (T1) under non-saline (S0) and saline (S1)
conditions. Two citrus rootstocks namely, sour orange (salt tolerant) and karna khatta
(salt susceptible) were used as planting material. Six months old uniform nucellar
seedlings were selected on the basis of vigour, leaf size and shape. These seedlings were
then transplanted in plastic pots (12 inches size) containing 5 kg garden soil and FYM
(4:1). Paclobutrazol were applied to soil after one month of transplanting. To develop
soil E.C. (1:2) ≈ 3.0 dS m-1, computed amount of NaCl (15 g) was applied in 1½ litre
water per pot after seven days of paclobutrazol treatment. The non-salinised soil was
used as control (E.C. (1:2) 0. 35 dS m-1 and pH (1:2) 7.1). Putrescine was applied as foliar
application on the same day of salt treatment. The plants were irrigated with tap water
(E.C. (1:2) 0.1 dS m-1) at regular intervals in order to keep the soil moisture level at field
capacity. Every effort was taken to avoid leaching. Observations on growth,
physiological and biochemical parameters as well as tissue nutrients status were
recorded. Results revealed that all the growth parameters except root to shoot ratio
decreased with NaCl stress in both the rootstocks. However, the reduction in plant height
was more pronounced (37.95%) in sour orange than Karna khatta (18.41%). Under nonsaline
condition, paclobutrazol reduced plant growth in both the rootstocks at varying
degree. However, putrescine improved these parameters under both saline and non-saline
conditions as compared to control. Application of paclobutrazol or putrescine alone or in
combination was found to improved most of the growth parameters under saline
condition as compared to the salinized control. Paclobutrazol behaved differently in both
the rootstocks and higher dose of paclobutrazol (500 ppm) with or without putrescine
improved most of the parameters studied under saline condition in Karna khatta. While
in case of sour orange, application of lower dose of paclobutrazol (250 ppm) with
putrescine (50ppm) was found most effective in mitigating salt induced alterations.
Further, both paclobutrazol and putrescine enhanced different physiological and
biochemical parameters including photosynthetic pigments, photosynthetic rate, stomatal
resistance, relative water content, proline, phenol and activity of antioxidant enzymes
(super-oxide dismutase, catalase and peroxidase) under salt stress. Paclobutrazol and
putrescine alone or in combination reduced uptake and accumulation of sodium and
chloride and improved the concentration of beneficial elements in tissues in both the
rootstocks even under saline condition as compared to non-treated salinised control
plants.
It is clearly evident from the above findings that plant bio- regulators like
paclobutrazol and putrescine (polyamines) imparts a protective role thereby,
ameliorating salt induced alterations in both the citrus rootstocks. The findings of the
present investigation opens up a new vistas and possibilities of growing citrus (a salt
sensitive crop) even in areas affected with salinity.
 
Date 2016-12-22T12:02:27Z
2016-12-22T12:02:27Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/92136
 
Format application/pdf
 
Publisher DIVISION OF FRUITS AND HORTICULTURAL TECHNOLOGY