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Screening for Deep Rooting Ability.

Mrs. Munnujan Khanam
Senior scientific officer
Plant Physiology Division, BRRI, Gazipur

Dr. Serajul Islam
CSO and Head
Plant Physiology Division, BRRI, Gazipur

Abstract/ Executive Summary:

The study was conducted at BRRI, Gazipur. To identify cultivars/advanced breeding lines,sprouted seeds of 22 advanced breeding lines with 3 check varieties were sown in root elongation tube.The following observations were recorded at 30 days after sowing, cumulative root length, thick root number (> 1mm thickness) and Root & Shoot dry weight (g) at 40-60 cm soil depth. The sum of the length of roots was called cumulative root length (CRL) or total root length (TRL). For upland rice CRL or TRL of thick roots below 40 cm depth was considered the most important criteria for drought tolerance of upland rice because thick roots persist longer, produce more and larger branch roots, thereby increasing RLD (Root) length density and water uptake capacity. Among the tested entries, the number of thick roots varied remarkably. The highest number of thick roots at deeper soil depth (40-60 cm) was produced by BR6846-2B-49 (7.89) and the lowest by BR6848-2B-32 (1.67); however the check BR21 produced the number of thick roots which was 6.22. Rooting ability is a ratio of root and shoot and it expresses the amount of root (mg) produced below 40 cm soil depth per gram of shoot. The highest amount of root produced below 40 cm soil depth by the check BR21 (7.61 mg/g of shoot) and the lowest by BRRI dhan43 (1.27 mg/g of shoot). The line or variety scored 5.67 or less which means that line/variety was better than check BR21. Among the tested entries BR6973-2B-1, BR6976-2B-11, BR6976-2B-3, IR75516-30-1-1-B, BR6846-2B-49 & BR6855-2B-16 showed the mean score 5.67 or less meant these lines might be performed well than in water deficit condition.

Keywords: Rice, Deep rooting ability, Screening, Long root, Thick root.

Location: Plant Physiology Division, BRRI, Gazipur

Start Date: 00-07-2004

End Date: 00-06-2005

Program Area: Variety and Species

Commodity: Rice

Objectives:

To identify cultivars/advanced breeding lines, which can produce long and thick root.

Methodology:

The study was conducted at BRRI, Gazipur. Sprouted seeds of 22 advanced breeding lines with 3 check varieties namely BR21, BRRI dhan42 and BRRI dhan43 were sown in root elongation tube in the greenhouse of Plant Physiology Division. Root elongation tube was a 60 cm long and 9.5 cm diameter perforated polyethylene tube filled up with 60:40 sand: soil mixture. Three seedlings were maintained in each tube and the tubes were irrigated with Yoshida’s culture solution throughout the experimented period. The following observations were recorded at 30 days after sowing: Cumulative root length, thick root number (> 1mm thickness) and Root & Shoot dry weight (g) at 40-60 cm soil depth.

Source of Information: Proceedings of the BRRI Annual Internal Review for 2004-2005 (Held on 18-22 December 2005). Bangladesh Rice Research Institute (BRRI), Gazipur-1701.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

BR6973-2B-1, BR6976-2B-11, BR6976-2B-3, IR75516-30-1-1-B,BR6846-2B-49 & BR6855-2B-16 were scored same as or less than score of BR21 (5.67) were selected as deep-rooted lines.

Knowledge Management: Report/Proceedings