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Anaerobic and Submergence Tolerance of Swarna Sub 1 and Some Other Rice Genotypes

J K Biswas
Plant Physiology Division, Bangladesh Rice Research Institute, Gazipur 1701.

M A Hasan
Department of Agriculture Extension.

H N Barman
Plant Physiology Division, Bangladesh Rice Research Institute, Gazipur 1701.

Abstract/ Executive Summary:

A genotype with traits of anoxia as well as submergence tolerance would provide a better opportunity to establish and withstand the submergence thrust under lowland conditions. Swarna Sub 1, a rice genotype developed through introgression of Sub 1 QTL from FR13A (Donor parent) is able to tolerate submergence stress under flood-prone transplanted Aman environment. However, its potential as an anaerobically established genotype has not yet been studied. Therefore, two experiments were conducted to study the nature of anaerobic and submergence tolerance of Swarna Sub 1, with some other rice genotypes. Swarna Sub 1 showed comparable seedling establishment under lowland conditions. Irrespective of genotypes anaerobically grown, 20-day-old seedlings could not recover after 10-day of submergence.

Keywords: Submergence tolerance, Seedling establishment, Rice

Location: Plant Physiology Division of Bangladesh Rice Research Institute (BRRI), Gazipur

Start Date: 00-07-2007

End Date: 00-12-2007

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

Determine the anaerobic tolerance of Swarna Sub 1;
Study the ability of submergence tolerance of this genotype following as anaerobic thrust in the process of germination.

Methodology:

We conducted two experiments at the Plant Physiology Division of Bangladesh Rice Research Institute (BRRI), Gazipur in 2007. Experiment 1: Twelve varieties were considered in the experiment 1, layed out in CRD with four replications. The treatments of the experiments were aerobic, hypoxic, and anoxic conditions. Prior to go for germination, the seeds were treated with 2% sodium hypoclorite for 15 minutes. Seedlings were grown under aerobic {in a petridish (100×90-mm) lined with soaked paper} hypoxic and anoxic conditions. The hypoxic condition was maintained in the test tube (100×25-mm) containing 20 mm of distilled water with 50 mm water depth above the seed. Under anoxic conditions the test tube, containing 18 ml of distilled water and 2 ml olive oil. Five sprouted seeds were allowed to grow in each test tube. The test tubes were kept under 30°C in a germinator. The coleoptile length of seedlings were considered for observation. Experiment 2: Out of 12 varieties (from Experiment 1), five genotypes were considered in this study. Except BR11 and Swarna Sub 1, the others were known as anoxia tolerant genotype (Islam., 2005; Yamauchi et al, 1993). Plastic trays (32×28×13 cm) were used for this study. The trays were filled with 16 kg clay loam soil (OM = 0.9-1.5%, pH = 4.5-6) fertilized with urea, TSP, MP, and gypsum @ 8 g, 5 g, 5 g and 3.2 g respectively per tray. The soil was soaked, puddled and kept flooded for seven days to reduce the accumulated volatile fatty acids. There were two kinds of seeding; aerobic (seeds were surface seeded) and anaerobic (seeds were placed 1 cm below the soil surface and the tray was irrigated up to 1 cm depth). Each tray contained six lines and 10 sprouted seeds were sown per line. Each variety was replicated thrice in three trays. Percent seedling establishment was recorded. Twenty-day-old established seedlings were submerged in a cemented water tank (submergence tank) to a depth of 70 cm above the soil level. The water was made turbid twice daily by mixing mud (soil particle of the water was 1.53 g/L; Pervin et al, 2006). After a day of submergence, the trays were transferred to net-house. Recovery percentages after seven days were recorded. The percent seedling establishment was analyzed as CRD with necessary transformation.

Source of Information: BANGLADESH RICE JOURNAL 16(1):95-100, June 2012 ISSN 1025-7330

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Swarna Sub 1 showed some better seedling attributes under hypoxic conditions leading to superior seedling establishment under lowland conditions.
Irrespective of genotype, anaerobically and aerobically grown 20-day-old seedlings could not recover after 10-day submergence.

Knowledge Management: Journal