The Flowering Response of the Rice Plant to Photoperiod

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The Flowering Response of the
Rice Plant to Photoperiod
Los Banos, Laguna, Philippines
Mail Address: P. O. Box 933, Manila, Philippines
First printing 1969
Partially revised 1972
Revised 1976
Revised 1985

The International Rice Research Institute (IRRI) was established in 1960 by the Ford and Rockfeller Foundations with the help and approval of the Government of the Philippines. Today IRRI is one of the 13 nonprofit international research and training centers supported by the Consultative Group for International Agricultural Research (CGIAR). The CGIAR is sponsored by the Food and Agriculture Organization (FAO) of the United Nations, the International Bank for Reconstruction and Development (World Bank), and the United Nations Development Programme (UNDP). The CGIAR consists of 50 donor countries, international and regional organizations, and private foundations.

IRRI receives support, through the CGIAR, from a number of donors including: the Asian Development Bank, the European Economic Community, the Ford Foundation, the International Development Research

Centre, the International Fund for Agricultural Development, the OPEC Special Fund, the Rockefeller Foundation, the United Nations Development Programme, the World Bank, and the international aid agencies of the following governments: Australia, Canada, China, Denmark, France, Federal Republic of Germany, India, Italy, Japan, Mexico, Netherlands, New Zealand, Norway, Philippines, Saudi Arabia, Spain, Sweden, Switzerland, United Kingdom, and United States.

The responsibility for this publication rests with the International Rice Research Institute.
Copyright @ International Rice Research Institute 1986
All rights reserved. Except for quotations of short passages for the purpose of criticism and review, no part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior permission of IRRI. This permission will not be unreasonably withheld for use for noncommercial purposes. IRRI does not require payment for the noncommercial use of its published works, and hopes that this copyright declaration will not diminish the bona fide use of its research findings in agricultural research and development.

The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of IRRI concerning the legal status of any country, territory, city, or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries.

ISBN 971-104-151-0
Introduction 1
Rice as a Short-day Plant 1
Growth Phases 2
Basic Vegetative Phase 4
Photoperiod-Sensitive Phase 5
Photoinductive Cycles 7
Reception of the Photoperiodic Stimulus and Translocation 9
Light Intensity and Quality 9
Interruption of the Dark Period 11
Days from Photoinductive Treatment to Flowering 12
Biochemical Changes During Photoinduction 12
Effect of Temperature on the Flowering Response to Photoperiod 13 Measurements and Methods of Testing Photoperiod Sensitivity 14 Date-of-Planting Experiments 15
Ecology and Photoperiodism 17
Terminology Used in Describing Photoperiod Sensitivity 20
Inheritance of Vegetative Growth Duration 23
Problems in the Study of the Rice Plantfs Photoperiodism 25 Summary 26
Appendix 28
Bibliography 38
This review, first published in 1969, has been an important reference in understanding the rice plant. It has had a small but continuing demand. Many new reports on the flowering response of the rice plant have been published since the first edition. More than 100 publications were included in the third edition; this edition includes another 103 publications. For ease of reading, numbers have been used to cite the references.

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