Panjab University Research Journal (Science)
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SOURCE–SINK MANIPULATION AND ITS EFFECT ON POTENTIAL GRAIN YIELD OF RICE (ORYZA SATIVA L.)

Davood Eradatmand Asli*, I.S. Dua and Hamid Mehrpanah

Department of Agronomy and Plant Breeding, Islamic University of Saveh, Saveh, Iran

Department of Botany, Panjab University, Chandigarh - 160 014

*Corresponding author : eradatmand_d@yahoo.co.in

Abstract
A field experiment was conducted to investigate the hypothesis that yield of some cultivars of rice (Oryza sativa L.) may be limited by potential seed size. In this investigation, the source – sink ratio was manipulated to examine the performance of source-sink interactions after anthesis and the factor(s) limiting grain filling. Plants of three rice cultivars were artificially modified to give different source – sink ratios. The treatments were; I. control, II. cutting flag leaf blade, III. thinning half of the plants, IV. cutting flag leaf blade and thinning. The distribution of dry matter between kernels was analyzed at harvest in all the three cultivars. For determining potential grain weight in each plot, 50 per cent of grains at anthesis in mean shoot was reduced. Modification of source – sink ratio led to different patterns of allocation of dry matter between cultivars. The pattern of partitioning of dry matter observed in plants suggests both source and sink limitation in different rice cultivars. Also, in one of the cultivars there was a relative balance between source and sink and none of the two factors were limited.

Key words:Thinning, Flag Leaf, Source, Sink, Manipulation, Rice.
 

 
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