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Comparative Study of Floral Characteristics in the Component Lines of Hybrid Rice (oryza Sa Tiva L.)

Dr. Md. Jamil Hasan
Principal Scientific Officer
Head Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Umma Kulsum
Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Abstract/ Executive Summary:

Significant variations were obtained among the component lines for most of the floral traits. BRRI9A exhibited superiority for angle of open florets, stigma length and breadth, anther breadth, filament length, style length and panicle exertion rate while its corresponding maintainer lines BRRI9B showed superiority for duration of open florets, stigma length and breadth, anther breadth and filament length. This indicated BRRI9A and its corresponding maintainer line BRRI9B possessed very good floral traits that influence out crossing. Among the restorer lines BR168R showed superiority for duration of open florets, angle of open florets, duration of bloomed florets/panicle, stigma length, anther length and number of pollen/microscopic focus. This suggested BR168R could be used as promising restorer line with BRRI9A for hybrid seed production in local condition.

Keywords: Floral characteristics, Component lines, Hybrid rice

Location: BRRI HQ, Gazipur

Start Date: 03-07-2007

End Date: 30-11-2007

Program Area: Variety and Species

Commodity: Rice

Objectives:

To study the floral characteristics influencing out crossing rate of component lines of hybrid rice under local environment.

Methodology:

Seven CMS lines, their corresponding maintainer lines and 30 restorer lines were evaluated to identify promising parental lines in respect of floral traits for developing heterotic rice hybrids with effective seed production potentiality. There were three blocks in the experimental field: one for CMS, another for maintainer and the other for restorer lines. Seedlings of each of these lines were raised in bed and 21 days old seedlings were transplanted in one plant/hill in the experimental plots. The plots were 3.5 meter in length containing three rows. The plant spacing provided was 20 cm between rows and 15 cm between plants of the same row. Adequate soil fertility was ensured by applying urea TSP-MP-gypsum- ZnSO₄ @ 150:100:70:60:10 kg/ha, respectively. Total TSP, MP, gypsum and ZnSO₄ were applied during final land preparation. The urea was applied in three installments, at 15 days after transplanting (DAT), 30 and 45 DAT. Necessary intercultural operations were carried out during cropping period for proper growth and development of the plants. Five sample plants were randomly selected from each plot excluding the border plants and the following data were recorded: duration of floret open (DOF), per cent panicle exertion (PPE), angle of open floret (AOF), stigma length (SL), stigma breadth (SB), anther length (AL), anther breadth (AB), stigma exertion rate (SER), filament length (FL), out crossing rate (OCR), days to 50% flowering and days to maturity. Maintainer and restorer lines are inbred lines so, panicle exertion, stigma exertion and out crossing rate were not measured for them. Number of pollen/microscopic focus was measured only for restorer line. Data were analyzed according to MSTAT C software.

Source of Information: Bangladesh Journal of Botany, 43(1): 1-8, 2014 (June)

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 20000/-

Total Budget (Tk.) : 20000/-

Achievement/Findings:

CMS lines and its corresponding maintainer lines are genetically isogenic except for pollen fertility. Maintainer lines showed viable pollen and it maintained the sterility character of corresponding CMS lines. BRRI developed restorer line BR6723-1-1-2R, BR168R and BR6839-41-5-1R found to have high pollen loads as compared to other restorer lines which is very import for fertility restoration in CMS lines during hybrid seed production.Floral characteristics of the component lines revealed that CMS line BRRI9A and its corresponding maintainer line BRRI9B possessed excellent floral characteristics that could influence out crossing potentiality if restorer line BR168R is used for hybrid seed production.

Knowledge Management: Journal