Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Some Aspects of Mechanisms of Nacl Stress Tolerance in the Seedlings of Four Rice Genotypes

A.N.M. ALAMGIR
Department of Botany, Chittagong University, Chittagong-4331, Bangladesh

MOHAMMAD YOUSUF ALI
Department of Botany, Chittagong University, Chittagong-4331, Bangladesh

MOHAMMAD MUSA
Department of Botany, Chittagong University, Chittagong-4331, Bangladesh

Abstract/ Executive Summary:

Biomass production under salt stress decreased with the sequence: IRATOM-24 > BR 9 > Nonabokra > Pokkali. In Pokkali root-shoot dry wt. was less affected and it maintained high root to shoot ratio (R/S) and their tolerance indices (T₁). Salinity stress increased Na⁺, Cl^- and decreased K⁺ and Ca⁺ contents and consequently their ratios in both root and shoot of the seedlings. Under stress proline level was increased in both root and shoot of the seedlings in all genotypes, the highest was observed in the root of Pokkali and in the shoot of IRATOM-24. Excepting BR 9 salinity increased protein content in other genotypes and among them Nonabokra maintained the highest protein level. Salinity inhibited the root ATPase activity in all except Pokkali. Efficiency of the maintenance of relatively high dry matter, R/S ratio, essential ions, K⁺ - Ca²⁺ / Na⁺ ion ratios, proline and protein contents in the seedlings including the root ATPase activity may be important aspects of NaCl stress tolerance mechanism as found in one or another rice genotype of the present work.

Keywords: Salinity, Stress tolerance, Proline, Protein, ATPase activity

Location: Department of Botany, Chittagong University, Chittagong-4331, Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

1. In the present work some attributes associated with NaCl stress tolerance in the seedling of four rice genotypes were investigated.

Methodology:

Four rice (Oryza sativa L.) genotypes (BR-9 and IRATOM-24 - high yielding salt sensitive, and Nonabokra and Pokkali - salt tolerant varieties) were taken and their 20 days old seedlings were grown in 8L plastic pots (3 seedlings/hill, 3 hills in each) containing 7 kg mixed soil with cow-dung (3:1) in the open air with irrigation and NPK fertilizers two days before transplantation. For salinity stress 0.20 molal NaCl (25.2 dS.m^-1) was applied in treatment after 10 days following transplantation. It was comparable to sea water (22.7 dS.m^-1) and soil salinity of the coastal belt (3.86 - 27.1 dS.m^-1). Plant samples were harvested after 40 days. Ions were extracted from dried powdered plant material by 0.1 M acetic acid keeping in hot water bath (90ºC) for 2h. Na⁺, K⁺ and Ca²⁺ were determined in the filtrate in flame photometer and Cl^–by titremetric method. Protein, proline and root ATPase activity were measured.

Source of Information: Bangladesh J. Bot. 36(2): 181-184, 2007 (December)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It is evident that a single mechanism may not be effective for the overall salt tolerance efficiency, but the cumulative effect of a number of factors that are associated with biomass production potential, R/S ratio, relatively higher efficiency for the accumulation of K⁺ and Ca²⁺ than Na⁺ and Cl^-, high K⁺/Na⁺ ratio, lower rate of Na⁺ transport to shoot, high proline and protein contents, membrane integrity and high membrane ATPase activity be involved in the development of salt tolerance efficiency.

Knowledge Management: Journal