Effect of different rootstocks on Kinnow mandarin [Citrus nobilis Lour x Citrus deliciosa Tenora]
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Date
2015
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Publisher
Division of Fruits and Horticultural Technology Indian Agricultural Research Institute New Delhi
Abstract
Present investigation was carried out to study the root morphology of one year
old seedling and the influence of different rootstocks in pre-bearing Kinnow mandarin
under field condition on plant morphological, physiological, tissue nutrients and
biochemical parameters at the Division of Fruits and Horticultural Technology, I.A.R.I.,
New Delhi during 2014-15.
Results of the findings revealed that the seedling rootstock of rough lemon had a
better root morphology with respect to root length (1511.27cm), projected area
(158.42cm2
), surface area (482.00 cm2
), root volume (12.24 cm3
) and the number of
forks (7026.80) with a comparatively inferior root morphology in Carrizo. Comparative
performance of budded Kinnow on different rootstocks showed that trees on Jatti Khatti
were superior in terms of stimulated increase in plant height (49.42%) and canopy
volume (22.56%) during the period April-September, compared to minimum
enhancement in Kinnow trees on Troyer citrange during the same period. Kinnow trees
on different rootstocks maintained congenial relationship with the scion closest to 1.0.
Leaf sclerophylly in terms of leaf area, fresh mass, dry matter and density of foliar tissue
was higher in Jatti Khatti but leaves more succulent on rough lemon. Kinnow leaves on
Karna Khatta and rough lemon maintained significantly higher relative water content
(88.61%). However, chlorophyll fractions was higher in leaves on rough lemon with
reduced chlorophyll fractions on Carrizo rootstock. Higher physiological activity in
terms of photosynthetic rate, stomatal conductance, and internal CO2 was recorded in
scion leaf of Kinnow on rough lemon during summer and during autumn and winter on
Jatti Khatti and rough lemon. Leaf N and P content was higher in leaf tissue on sour
orange while K, Ca and Mg content was higher in leaf tissue on rough lemon. Sodium
accumulation in leaves was higher in Rangpur lime as compared to Troyer which
accumulated minimum sodium. Leaf tissue of Sour orange excelled in micronutrients
and maintained higher Fe, Zn, Mn and Cu in their leaves. Kinnow scions on rough
lemon exhibited higher enzyme activities with respect to total soluble protein,
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superoxide dismutase, peroxidase, and glutathione reductase activity, while catalase
activity was significantly higher on sour orange rootstock. Proline accumulation was
also observed to be higher on sour orange rootstock. Scion leaf on Troyer rootstock
accumulated 1.88 fold more phenol. Polyphenol oxidase activity was observed higher in
scion leaves on Jatti Khatti with minimum activity on Troyer and Carrizo citrange
rootstock.
From the findings of this study, it is concluded that rough lemon rootstock
imparted higher metabolic activity in Kinnow scion, while sour orange accumulated
more nutrients in their tissue. Carrizo proved to be an inferior rootstock with most of the
characters studied.
Description
T-9168
Keywords
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