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Salinity Effect on Dry Mass Partitioning in Different Plant Parts and Ion Uptake in Leaves of Rice Mutants

M. Monjurul Alam Mondal, PhD
Principal Scientific Officer
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The experiment was carried out in pot culture at the glass house of BINA, Mymensingh during November 2009 to April 2010 to investigate the effect of different salinity levels on dry mass production and its partitioning into different plant parts and mineral ion uptake in leaves and its consequence on grain yield in six rice mutants viz., RM350-130, RM300-280, RM250-1080, RM250-170, RM250-2080 and IRATOM. The four levels of sodium chloride induced salinity levels, 0, 6, 9 and 12 dSm^-1 were imposed at 25 days after planting. Results indicated that morphological parameters, physiological characters, yield attributes, mineral ions in leaves such as potassium and calcium were decreased with gradual increasing of salinity levels while number of non-effective tillers hill^-1 and Na content of leaves were increased with increasing soil salinity. Generally genotypes having ability to exclude Na from leaves were found salt tolerant in respect of dry mass production in different plant parts and vice versa. Among the genotypes, the dry matter production and yield loss due to salinity was less in RM250-170 and RM250-2080 than that in the others, which further revealed that RM250-170 and RM250-2080 had a greater tolerance to salinity than RM350-130, RM300-280, RM250-1080 and IRATOM.

Keywords: Salinity stress, Dry mass production, Yield attributes, Mineral ion, Rice mutant

Location: Pot yard, Bangladesh Institute of Nuclear Agriculture, Mymensingh

Start Date: 30-11-2009

End Date: 29-04-2010

Program Area: Variety and Species

Commodity: Rice

Objectives:

To assess the effect of salinity stress on dry mass partitioning into different plant parts and mineral ion uptake and its relation with grain yield in rice.

Methodology:

The pot culture experiment was carried out at the glass house of Bangladesh Institute of Nuclear Agriculture, Mymensingh, during the period from 15 November 2009 to 20 April 2010. The pots of the experiment were filled with 3 kg of soils. The pots were placed in 150-Liters tray type water reservoir for nutrient solution and maintained of salinity. The water depth of the reservoir was 18 cm and it was always maintained by addition of water at weekly basis. For smaller size of the pots, a Hoagland’s solution was used weekly in water reservoir for normal plant growth and development.

The experiment was designed in a Split Plot arrangement with four replications in which salinity treatments were the main factor and genotypes the sub-factor. The treatments of the experiment were: Six rice mutants viz., RM350-130, RM300-280, RM250-1080, RM250-170, RM250-2080 and IRATOM, and four levels of salinity viz., 0, 6, 9 and 12 dS m^-1. The required quantities of commercial salts were applied to water reservoir at 25 days after sowing to impose salinity. The salinity levels of the water reservoir was monitored weekly by EC meter and saline solution was added (when necessary) to maintained required salinity level in the reservoir. Water was supplied to water reservoir as and when needed to maintain a specific water height to ensure sufficient moisture for the normal growth of the crops. Sodium, potassium and calcium contents were determined from leaves. Analysis of mineral ion contents was carried out after extracting of given amount of plant sample in nitric acid for at least 2h at 90 ⁰C. Alkali cations were determined by atomic absorption spectrophotometry. At harvest, morphological parameters, dry mass weight in different plant parts, yield attributes and grain yield was recorded. The collected data were analyzed statistically.

Source of Information: Journal of Environ. Science & Natural Resources, 6(1): 239 - 245, 2013

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The rice mutants were variably affected in morpho-physiological attributes and yield contributing characters by different levels of salinity; and among the mutants, RM250-2080 and RM250-170 were found comparatively more tolerant under 12 dSm^-1 saline condition than the other genotypes with less TDM and yield reduction. Therefore, these two mutants may have adopted themselves in moderate saline condition after few more field trials.

Knowledge Management: Journal