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Screening of Some Transplanted Aman Rice Cultivars Under Water Stress Condition

Dr. Md. Tariqul Islam
Principal Scientific Officer and Head
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Two pot experiments were carried out with nine rice varieties subjected to moisture stress at booting and flowering stage at the Bangladesh Institute of Nuclear Agriculture, Mymensingh, Bangladesh, in 1997 and 1998 to observe the mojph-physiological changes and to identify variety for water stress tolerance. Thirty % field capacity (FC) was maintained during stress at booting and flowering and 100 %FC was maintained in the control plants. Plant height, panicle number, panicle length, 1000-grain weight, harvest index (HI), total dry matter (TDM), leaf water potential (LWP) and yield were suppressed with the stress. Under control LWP was -5.1. to -6.3 bar and it was decreased to -11.7 to -12.6 bar due to water stress. Grain yield was associated with middy LWP under stress at booting and flowering stage in both the years. Binashail performed the best under water stress producing the highest TDM, HI and yield and maintained the highest LWP under the stress. BINA-115 showed medium TDM but lower yield. G-67 showed higher TDM and yield, and higher numbers of grains/panicle. It produced larger grain and maintained medium LWP under the stress and ranked next Binashail in respect to stress tolerance. Other varieties showed susceptible to water stress.

Keywords: Rice, Water stress, Yield, Leaf water potential

Location: Bangladesh Institute of Nuclear Agriculture, Mymensingh

Start Date: 27-07-1997

End Date: 13-12-1998

Program Area: Variety and Species

Commodity: Rice

Objectives:

The objectives of the study were to assess the effects of water stress on rice genotypes and to identify rice genotype tolerant to water stress.

Methodology:

Two Experiments were conducted in plastic pots at the Bangladesh Institute Nuclear Agriculture (BINA), Mymensingh, Bangladesh during the period form July 27 to December 13 of 1997 and 1998. The soil was sandy loam in texture having pH 6.7, organic C 0.65 total N 0.09 and available P 9.3 (µgg -1). Three treatments [30 %FC at booting stage, 30 %FC at flowering stage, and Control (100 %FC)], 9 varieties and 4 replications were used in this study. The design of the experiment was CRD. Each pot contained 4kg soils. The pots were placed in the experimental plot near the glasshouse at BINA. Plants materials used in this experiment were: V₁-BR22, V₂-BRRI dhan31, V₃-BRRI dhan32, V₄-Nizershail, V₅-Binashail,V₆-an advanced line BINA-115(Latter it was released as Binadhan-4), V₇-an advanced line BINA-163, V₈-a local cultivar G-32 and V₉-a local cultivar G-67. The stress treatments were imposed at desired level by adding measured amount of required water ( measured with a weighing balance, every day). One seedling of 30 days was transplanted on 21 August to each of pot and maintained a similar level of 100 %FC (Field Capacity). At the end of each growth stage, stress was discontinued. Urea, TSP (Triple Supper Phosphate), MP (Muriate of Potash) and zinc sulphate of 432 mg, 132 mg, 200 mg and 72 mg respectively at 2.5 times rate of 60 kg N, 18 kg P₂O₅, 36 kg K₂O, 8 kg ZnSO₄ per hectare were used. Plant height, number of panicles/plant, number of grains/panicle, 1000-grain weightand yield were recorded. Leaf water potential (LWP) was measured by following the manualof Wescor (1993) and Boyer (1995). Harvest index (HI) was determined using the formula given below: HI= Grain yield/Biological yield.

Source of Information: Bangladesh J. Train and Dev. 14(1&2), 2001: 213-220

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Binasail showed tolerance to water stress compared to other rice genotypes.

Knowledge Management: Journal