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The Relationship Between Top Leaves and Grain Development in Rice

M. A. Smad
Department of Genetics & Plant Breeding, Bangladesh Agricultural University, Mymensingh.

C. A. Razzaque
Department of Genetics & Plant Breeding, Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

An experiment was set up to investigate if the removal of enti re, one half cr one quarter of the blades of the three top leaves had any effect on the number of the total, fertile, partially developed, and sterile spikelets, grain-yield, lO:>.grain weight and gra in ma- turty in rice. Three varieties Mala, IE8 and Dharial were used as experimental materials and grown in the field during the Aus season of 1973. Varietal differences were observed with regard to all the characters studied except the number of partially developed spikelets per panicle. The flag-leaf was found more closely connected with the frequency of the fertile spikelets and partially developed spikelets than the lower two leaves. The frequency of sterile and to ta 1 sp ike- lets were, however, independent of the the three top leaves. The removal of the flag-leaf reduced I0 grain weight. Gra in yield de creased with the decrease in the area of the flag leaf due to treat, ment. The effect was, more pronounced with the removal of the entire flag-leaf blade then the removal of the blades of tbe lower leaves. The time to mature was independent of the effect of the treatments. A variety-treatment interaction on the number of fertile spike lets per panicle was observed with the removal of the entire blade of the three top leaves in IR8. Variety-treatment interaction on grain yield was, however, observed among some varieties and treatments with a few exceptions.

Keywords: Relationship, Top leaves, Grain, Development, Rice

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To investigate into the relative importance of the flag-leaf, the second and the third leaf and the size of their blades to the yield of grains and yield contributing characters.

Methodology:

Mala, IR8 and Dharial, the three varieties adapted to Aus season in Bangladesh were selected as experimental materials. The three varieties are quite different in their yielding ability. Mala and IR8 are improved varieties and Dharial is a local variety. There are differences with regard to leaf length and breadth and greenness of the leaves. With regard to maturity Dharial is early, Mala is medium and the IR8 is a late maturing variety. Therefore, the chosen varieties represented different plant types The present experiment was conducted in the field of the Bangladesh Agricultural University Farm at Mymensingh. The experiment was set up in split-plot design. The experimental field was divided into 4 equal blocks and each block divided into 3 main plots (one for each variety placed at random). Each main plot contained 21 sub-plots and each sub- plot contained a single row. Out of 2l sub-plots only 10 sub-plots were randomly selected for different treatments and control, the remaining alternate 11 sub plots were used as boarder rows for each selected sub-plot. In each row 9 plants were grown with 30 ern. spacing between rows and 20 cm. between plants in a row. The dose of fertilizer used was the average of the doses prescribed by the Bangladesh Agri- cultural Development Corporation for improved varieties and local varieties (A- nonymous, 1971). The seeds were sown in lines and standard cultural practices were followed. The blades of the flag, second and third leaves from first three formed culms were removed in full, one half and one quarter in each variety by cutting with a pair of surgical scissors. Combination of three types of leaves and three kinds of treatments gave 9 treatments for each of the three varieties. The control was maintained without treatment.

Source of Information: Bangladesh J. Agril. SCt. 3(2) : 112-119 : 1976

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Varietal differences were observed with regard to all the characters studied except the number of partially developed spike lets per panicle. The flag-leaf was found more closely connected with the frequency of the fertile spike lets and partially developed spike lets than the lower two leaves. The frequency of sterile and to ta 1 sp ike- lets were, however, independent of the the three top leaves. The removal of the flag-leaf reduced I0-grain weight. Grain yield de creased with the decrease in the area of the flag leaf due to treatment. The effect was, more pronounced with the removal of the entire flag-leaf blade then the removal of the blades of tbe lower leaves. The time to mature was independent of the effect of the treatments. A variety-treatment interaction on the number of fertile spike lets per panicle was observed with the removal of the entire blade of the three top leaves in IR8. Variety-treatment interaction on grain yield was, however, observed among some varieties and treatments with a few exceptions.

Knowledge Management: Journal