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AOBPreview originally published online on October 5, 2004
Annals of Botany 2004 94(6):811-817; doi:10.1093/aob/mch208
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Annals of Botany 94/6, © Annals of Botany Company 2004; all rights reserved

Bi-Phasic Growth Patterns in Rice

JOHN E. SHEEHY1,*, P. L. MITCHELL2 and ANAIDA B. FERRER1

1 International Rice Research Institute, DAPO 7777, Metro Manila, Philippines and 2 Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK

* For correspondence. E-mail j.sheehy{at}cgiar.org

Received: 8 March 2004    Returned for revision: 27 May 2004    Accepted: 16 August 2004    Published electronically: 5 October 2004

• Background and Aims When examining the growth patterns of rice crops for a 5-year period, it was found that the time course of accumulation of above-ground dry matter did not follow a simple sigmoid curve as expected for a monocarpic plant. Instead, there was a decrease in growth around flowering, followed by an increase and then a final decrease of growth at crop maturity. There are two nearly equal phases of growth in rice, with about half of the first phase of vegetative growth preceding reproductive growth.

• Methods Logistic curves were fitted separately to the vegetative parts of the crop and to the reproductive parts (the panicle). When the curves were summed, the combined curve gave a good description of the time course of above-ground dry matter, capturing the pause in growth and its resumption. The overall pattern of growth can be seen to be the result of this bi-phasic nature of the crop.

• Key Results Variations in the panicle phase of growth were shown to be largely a consequence of year-to-year variations in the weather, whereas the vegetative phase seemed largely independent of those variations.

• Conclusions Analysing rice growth as two components, each with a logistic curve, provides insight into the growth processes of the plant and the pattern of yield formation.

Key words: Rice, growth analysis, logistic function


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