Ramasamy et al. - 1997 - Yield formation in rice in response to drainage an

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80 S. Ramasamy et al./ Field Crops Research 51 (1997) 65-82 with increased efficiency (f,,) by which leaf N converted radiation into dry matter. Yet, it is concluded that yield response to drainage cannot, or not exclusively, be attributed to increased N uptake and the enhanced ‘source capacity’ normally associated with it. This observation, combined with consistently positive responses of indicators of root condition to drainage, indicates that the beneficial effect of drainage is via root functions other than N uptake. One possible mechanism is that drainage increases K availability or reduces the crop’s K requirement. The other is that drainage improves root condition, which leads in turn to a larger flow of cytokinins to the shoot, where they retard leaf senescence and stimulate translocation of reserves from stems to grains. The two mechanisms are possibly linked, K deficiency triggering the deterioration of root condition. Although poor drainage, cytokinin production in roots and grain yield have not been connected explicitly in rice literature, the causal relations between drainage and root condition, between root condition and cytokinins production, and between cytokinin levels, grain filling and leaf senescence are each well documented and provide the basis for the cytokinin hypothesis. The various hypotheses were not explicitly tested in this study. References Ambler, J.R., Morgan, P.W. and Jordan, W.R., 1983. Cytokinin concentrations in xylem sap of senescent and nonsenescent sorghums. Plant Physiol. Suppl., 72: 168. Aufthammer, W. and Solansky, S.. 1976. Effect of kinetin on assimilate accumulation in ears of spring barley. Z. Pflanzenem&r. Bodenkd., 1976(41: 5033515. Bano, A.. DoertIling, K., Bettind, D. and Hahn, H., 1993. Abscisic acid and cytokinins as possible root-to-shoot signals in xylem sap of rice plants in drying soil. Austr. J. Plant Physiol. 20: 109-115. Cheng, Y.S., 1983. 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