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Effect of Salinity at Reproductive Stage in Rice

A. M. Mojakkir
Department of Crop Botany, BAU, Mymensingh

M. Z. Tareq
Department of Crop Botany, BAU, Mymensingh

M. A. Mottalib
Department of Soil Science, BAU, Mymensingh

A. B. M. Z. Hoque
Department of Biotechnology, BSMRAU, Gazipur

M. A. Hossain
Department of Crop Botany, BAU, Mymensingh

Abstract/ Executive Summary:

A pot experiment was conducted with two rice cultivars viz, Pokkali (salt tolerant) and BRRI dhan 29 (salt sensitive) at the grill house in the Department of Crop Botany, Bangladesh Agricultural University (BAU), Mymensingh. The experiment was conducted to investigate the effect of two salt concentrations, 0 and 200 mM on reproductive growth of two rice cultiver. The experiment was laid out in Completely Randomized Design (CRD) with six replicates. From the investigation it was observed that growth in terms of yield declined due to reductions in panicle length, primary branch no., secondary branch no., filled grain no., thousand seed weight, chlorophyll content, tiller number, filled grain and increase unfilled grain etc.

Keywords: Salinity, Reproductive stage, Rice.

Location: Department of Crop Botany, Bangladesh Agricultural University (BAU), Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To investigate the effect of salinity on reproductive growth of rice.

Methodology:

Planting materials and nursing

Rice (Oryza sativa L.) seeds of the variety Pokkali and BRRI dhan 29 were obtained from the Crop Botany Department, Bangladesh Agricultural University (BAU) and Bangladesh Agricultural Development Corporation (BADC). BRRI dhan 29 is short-statured, short-duration and salt sensitive crop where Pokkali is tolerant and is an Indian local variety. Non-dehusked seeds were washed with water for priliminary seed treatment. The seeds were surface sterilized with ethanol for 3 minutes. The seeds then placed in plastic pots of 15 dm³ volume and filled with 14 kg soils and prepared with cow dung and basal doze of fertilizers (urea 250g, TSP 200g MoP 200g in 10 kg soil). Each pot contained 0.14m³ soil. The treatment solutions consisted of NaCl (0 and 200 mM) experimental containers were laid out in CRD with 6 replications, consisting of total 24 pots.

Chlorophyll determination

Leaf chlorophyll was measured calculations were done following the formula as follows:

C_a=0.0127 E 663-0.00258 E 645

C_b=0.02288 E 645-0.00467 E 663

Statistical analysis

The collected data on various parameters under study was statistically analyzed. Analysis of variance was calculated using the computer software program MSTATC.

Source of Information: INTERNATIONAL JOURNAL OF BUSINESS, SOCIAL AND SCIENTIFIC RESEARCH, ISSN: 2309-7892, Volume: 3, Issue: 1, Page: 07-12, January-February, 2015

Article Link (Online Journal): http://www.ijbssr.com/currentissueview/14013073

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Salt stress significantly reduced the growth of two rice genotypes during reproductive stage. Panicle length decreased at treated condition. Here BRRI dhan 29 decreased about 14% while the decrement was 4% in case of Pokkali. The grain number per penicle reduced due to salinity might be the reflection of reduced penicle length, decreased primary and secondary branches which are also important yield contributing factors. In all the cases the extent of decrement was higher in the BRRI dhan 29 (sensitive variety).

Result revealed that the number of filled grain per panicle was decreased at treated condition in both the varieties. Here filled grain per panicle in BRRI dhan 29 decreased highly (33%) while the decrement was 6% in case of Pokkali. At the same time, the number of unfilled grain per panicle was increased at treated condition in both the varieties. Unfilled grain per panicle number in BRRI dhan 29 increased highly (35%) while the increment was 15% in case of Pokkali. Grains production per hill was significantly affected due to high salinity. Result revealed that the weight of grain per hill was decreased at treated condition in both the varieties. In BRRI dhan 29 grain weight per hill decreased highly 15% while the decrement was 11% in case of Pokkali. It was observed the total tiller number and effective tiller number both decreased highly in BRRI dhan 29. Again reduced panicle length, smaller primary and secondary branch number was observed. All they might have strong influence in decreasing grain yield per hill.

Total grain weight per panicle was decreased 31% in BRRI dhan 29 and 5% in Pokkali in treated condition in comparison to their respective control. Reduced grain yield under salinity condition might be due to the production of lower number of grains per panicle and smaller seed size (low 1000-seed weight). Weight of 1000-seed was decreased 9% in BRRI dhan 29 and 7% in Pokkali in treated condition in comparison to their respective controls. Reduced 1000-seed weight under salinity condition might be due to lower assimilate production and translocation to grain which might be due to damage of chlorophyll.

Economic yield decreased in the treated condition as was observed in decrease in harvest index. Harvest index was decreased 29% in BRRI dhan 29 and 16% in Pokkali in treated condition in comparison to their respective controls. The result indicates that the seed health declined in the saline soils i.e. dry matter partitioning was not favorable under saline condition.

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