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Variations and Interrelationship in Root and Shoot Character of Selected Rices Under Aeroponic Culture

R. K. Das,
Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

M. A. Islam,
Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

M. K. Bashar,
Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

N. M. Miah
Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh

G. C. Loresto
International Rice Germplasm Centre (IRGC), International Rice Research Institute (lRRI), P.O. Box 933, Manila, Philioppines

Abstract/ Executive Summary:

The root and shoot characteristics of 17 aus rices of Bangladesh and 3 upland rice varieties of the Philippines were studied under aeroponic culture. Plant characteristics contributing to drought resistance, namely thick radicle, deep and thick root, high root- shoot ratio, low tiller number and tall plant are present in the traditional aus and upland rice varieties which have high or moderately high levels of drought resistance

Keywords: Root and shoot characters, Drought resistance, Aeroponic culture.

Location: BRRI-1701

Start Date: 10-10-1980

End Date: 15-05-1982

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

This paper reports study on the variation and the relationships among root and shoot characters that contributes to drought resistance in rice under aeroponic culture.

Methodology:

Seventeen aus rices of Bangladesh and 3 upland rice varieties of the Philippines, along with 1 upland variety from Guienea (Moroberekan) and semidwarf IRRI variety (IR20) were included in this study All the varieties were tested using an aeroponic culture technique developed by Carter (1941) and modified by Armenta-Soto (1981) in the IRRI Phytotron glasshouse with 29°C/21°C day night temperature at 70% relative humidity. The aeroponic set-up consisted of 6 round drums with fibre glass sides and wooden covers (104 x C 1.4 cm) and bottoms. The covers contains 97 holes each 5.0 cm in diameter, spaced at 7.5 cm from one hole centre to anther. Out of the 6 drums only 3 drums were used for this study and each drum represented a replication. A randomized complete block design with 3 replications was used with a population size of 3 plants per variety per replication. Eleven d old seedlings were transplanted into a styrofoam plant holder and grown in the aeroponic culture. The culture solution for feeding the roots was prepared from the stock solution based on the formula of Yoshida. et al,. (1976). During the 1 st week after transplanting, a 50% concentration of the culture solution was used. In the 2nd and 3rd weeks, the full concentration of the culture solution was used. The pH of the solution in the reservoir was checked thrice daily and maintained between 5.0 to 6.0. The plants were sampled 40 d after sowing (DS). The plant characters measured were radicle length, radicle diameter, root length, root thickness, root dry weight, shoot dry weight, root- shoot ratio, tiller number and plant height. Appropriate statistical analyses of the data were performed.

Source of Information: Bangladesh Rice J. 1(I) : 23-31 (1990)

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 65000/-

Total Budget (Tk.) : 65000/-

Achievement/Findings:

The drought resistance scores were found to have positive relationships with radicle length and tiller number and negative relationships with root thickness and root-shoot ratio. These results indicate that the varieties with short radicle, low tiller number, thick roots as well as high root-shoot ratio will be drought resistant. These findings agree with those of Armenta-Soto (1981) and Heque, ill sl: (1988). The plant characters related with drought resistance were at the vegetative stage as identified through this study could be utilized in the development of high yielding drought resistant varieties.

Knowledge Management: Journal