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Variations in Salinity Tolerance of Selected Mango Rootstocks

R. K. Roy
M.S. Student in Horticulture
Patuakhali Science and Technology University, Bangladesh

M. Robbani
Professor
Department of Horticulture, Patuakhali Science and Technology University, Bangladesh

M. Ali
Professor
Department of Horticulture, Patuakhali Science and Technology University, Bangladesh

S. K. Bhowal
Scientific Officer (Agronomy)
On-Farm Research Division, Bangladesh Agricultural Research Ins., Noakhali, Bangladesh

A. N. M. Erfan
M.S. Student in Horticulture
Patuakhali Science and Technology University, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at the Germplasm Centre, Department of Horticulture, Patuakhali Science and Technology University (PSTU) during the period from July 2011 to March 2013 to study the performance of selected mango rootstocks in the saline area in Bangladesh. The experiment consisted of four mango rootstock lines collected from Rangpur, Dumki, Khulna and Kuakata, and five salinity treatments namely control (0 dSm^{- 1}), low (4 dSm^-1), medium (6 dSm^-1), high (8 dSm^-1) and very high (10 dS^m-1). A two factor experiment was conducted in a Randomized Complete Block Design (factorial) with four replications. Results revealed that rootstock line and salinity levels had significant influences on various crop characters viz. length of rootstocks, diameter of rootstocks, number of leaves and percent rootstocks success and survivability. In case of rootstocks, the longest rootstock length (41.38 cm), highest number of leaves (37.58) and survivability (71.73%) were recorded in Rangpur line. In case of salinity treatments, rootstock diameter (16.09 mm), number of leaves/graft (36.47) and survivability (67.37%) were recorded in low salinity treatment. Interaction of rootstock lines and different salinity treatments showed significant variation on the length and diameter of rootstocks at 120 OAT. The maximum diameter of rootstock (17.63 mm) was recorded in high (8 dSm^{- 1}) salinity treatment in rootstock line of Kuakata, followed by the same stages of rootstock lines of Khulna (17.56 mm). The longest rootstock (46.75 em) was recorded in control treatment (0 dSm^-1) with rootstock line of Rangpur followed by the same stages of rootstock (41.75 cm) with medium salinity treatment (6 dSm^-1). Rangpur rootstock line performed best from 0-8 dSm^-1 salinity. The overall salinity tolerance was graded as follows: Rangpur rootstock line > Dumki rootstock line > Kuakata rootstock line > Khulna rootstock line.

Keywords: Mango rootstock, Salinity tolerance

Location: Germplasm Centre, Department of Horticulture, Patuakhali Science and Technology University

Start Date: 00-07-2011

End Date: 00-03-2013

Program Area: Variety and Species

Commodity: Mango

Objectives:

To study the salinity tolerance of selected mango rootstocks.

Methodology:

The experiment was conducted at the Germplasm Centre, department of Horticulture, Patuakhali Science and Technology University (PSTU), during the period from July 2011 to March 2013. The experiment consisted of two factors i.e. Factor-A: four type of mango rootstocks viz. R₁ = Rangpur line, R₂ = Khulna line, R₃ = Dumki line, R₄ = Kuakata line and Factor-B: five level of soil salinity viz. S_o= Control (0 dSm^-1), S₁ =Low (4 dSm^-1), S₂=Medium (6 dSm^{- 1}), S₃ =High (8 dSm^{- 1}), S₄ =Very high (10 dSm^-1). A two factor experiment was conducted in a Factorial Randomized Complete Block Design with four replications. Healthy and heavy stones of mango fruits of unknown cultivars were collected and placed in a bucket of water. Only those stones that sunk and touched the bottom of bucket (containing water) were selected. About 1000 stones were selected for this process, which were uniform in size and shape. The stones were placed in polybags containing a mixture of soil and cowdung at the ratio of 1:1. One stone was placed in one polybag. Nearly one and a half year mango rootstocks collected from four different types of mango cultivar which were raised in polybags previously & transplanted to the experimental pots. The healthy, vigorous, uniform in size and growth, pest and disease free rootstocks was selected for the experiment. Four different rootstock lines were collected from Rangpur, Dumki , Kuakata and Khulna region . At first rootstocks were separated from different types of rootstock by their proper identity through individual tagging. Four rootstock lines were arranged according to their identical number for properly data collection as well as performance review of different rootstock lines.The means of all the treatments were calculated and compared by Least Significant Difference (LSD) test at 5% level of probability (Gomez and Gomez,

Source of Information: Bangladesh Agron. J 2014, 17(1): 89-94

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results revealed that rootstock line and salinity levels had significant influences on various crop characters viz. length of rootstocks, diameter of rootstocks, number of leaves and percent rootstocks success and survivability. In case of rootstocks, the longest rootstock length (41.38 cm), highest number of leaves (37.58) and survivability (71.73%) were recorded in Rangpur line. In case of salinity treatments, rootstock diameter (16.09 mm), number of leaves/graft (36.47) and survivability (67.37%) were recorded in low salinity treatment. Interaction of rootstock lines and different salinity treatments showed significant variation on the length and diameter of rootstocks at 120 DAT. The maximum diameter of rootstock (17.63 mm) was recorded in high (8 dSm^{- 1}) salinity treatment in rootstock line of Kuakata, followed by the same stages of rootstock lines of Khulna (17.56 mm). The longest rootstock (46.75 cm) was recorded in control treatment (0 dSm^-1) with rootstock line of Rangpur followed by the same stages of rootstock (41.75 cm) with medium salinity treatment (6 dSm^-1). Rangpur rootstock line performed best from 0-8 dSm^-1 salinity. The overall salinity tolerance was graded as follows: Rangpur rootstock line > Dumki rootstock line > Kuakata rootstock line > Khulna rootstock line.

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