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A Study on the Panicle Development of Clustered Paddy

M. A. Razzaque
Agricultural Research Institute, Dhaka.

S. M. Hasanuzzaman
Bangladesh Rice Research Institute, Dhaka.

Abstract/ Executive Summary:

Khejurjupi, one of the rice varieties, shows clustering of spikelets. This was studied for the formation of clustering of spikelets on the panicle. The transformation of shoot apex to panicle primordia and subsequent development of first order branches of the panicle was normal. In some places several first order branches remained close to one another on the mother axis giving rise to clustering of first order branches. The development of second or der branches on the first order branches was characterized by suppression of growth of its internodes between two successive spikelets. All the spikelets that were born on second order branches formed a cluster. The compactness of clusters was due to the fact that, there was suppression of growth of the pedicel of individual spikelet of a cluster as a result of which the spikelets became sessile. Due to clustering of spike lets the sterility per cent varied from 8.33 to 21.31 which indicated a fair amount of spikelet sterility.

Keywords: Paddy, Clustered, Rice panicle

Location: Bangladesh Agricultural Research Institute, Dhaka.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

To study developmental anatomy of clustered habit and the formation of clusters on the rice panicle.

Methodology:

The local Aus variety Khejurjupi with clustered spikelets was grown in the field. From the 30th day after sowing, every day a few plants were pulled off and shoot apices were dissected out and observed under a stereoscopic microscope to find out the initiation of the panicle. As soon as the panicle was initiated ten samples, each measuring 1.0-1.5 cm, in length from the shoot apices of different panicle development stages were collected at every alternate day till the late boot stage and were fixed in FAA solution (Formaldehyde-S c.c., 70 per cent ethyl alcohol-90 c c. and glacial acetic acid-5 c.c.). A vacuum pump was used to drive off the air bubbles out of the materials in FAA solution to ensure better killing and fixing. Each sample was dehydrated, infiltrated and finally embedded and microtomed to obtain both longitudinal and transverse sections of each stage at a thickness of about 10-15 microns. The desirable parts of the ribbon on each stage were then fixed on slides, dried and stained with Safranin fast green combination. The developing panicle at the early stage was measured with a micrometer and the panicle at the mid boot stage was measured with a meter scale.

Source of Information: Bangladesh J. Agcil. Sci. 2 (2) 126.135; 1975

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

With the intimation of the panicle primordium, there was a conspicuous elongation of the shoot apex. The addition of more and more new cells in the primordial zone, there developed a small dome shaped bulge. The gene for the internode elongation of the mother axis remains normal whereas, at a certain stage of the panicle development the genes responsible for internode elongation of the first and second order branches ger aborted resulting in suppression of growth.

Knowledge Management: Journal