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Annals of Botany 81: 705-716, 1998
© 1998 Annals of Botany Company

Simulation and Prediction of Plant Phenology for Five Crops Based on PhotoperiodxTemperature Interaction

WEIKAI YAN+, and DONALD H. WALLACE

Department of Agronomy, Northwestern Agricultural University, Yangling, Shaanxi, 712100, China Department of Plant Breeding and Biometry, Cornell University, Ithaca, NY, 14853, USA

June 17, 1997 ; January 30, 1998 . February 11, 1998 .

This paper presents a plant phenological model based on genotypextemperaturexphotoperiod interaction (GPTmodel). In the model, rate of development towards a specified stage (e.g. flowering) for a given genotype is composed of three components: the genotype's maximum rate of development; any delay due to a non-optimal temperature; and any delay due to a photoperiod response. It is assumed that development to the specified stage is an autonomous process established by most, if not all, genes other than the vernalization genes and the photoperiod genes; and that this autonomous process is delayed by any activity of the photoperiod genes. Since all physiological processes are modulated by temperature, any photoperiod response is inevitably a photoperiodxtemperature interaction. This interaction is simulated by assuming that the photoperiod gene activity occurs only beyond a critical photoperiod (Pc) and is enlarged by temperature above a base temperature (Tbp) that allows the photoperiod gene activity. The model is written asR=1/Db-St(T-Topt)2-Sp(T-Tbp) |P-Pc|, whereRis the expected rate of development to the specified stage under any combination of temperature (T) and photoperiod (P). The other model parameters are:Sp, the sensitivity to a delaying photoperiod;Topt, the optimum temperature for development in the absence of the photoperiod response;St, the sensitivity to a non-optimum temperature; andDb, the basic duration to the specified stage (or intrinsic earliness), the inverse of which is the maximum rate of development.Dbis observable only ifT=Toptand simultaneouslyP>=Pcfor long-day plants (LDP) butP<=Pcfor short-day plants (SDP). The model is shown to successfully simulate and predict the published phenological data of five crops,viz.long-day plants: pea (Pisum sativumL.), oat (Avena sativaL.), and wheat (Triticum aestivumL.), and short-day plants: bean (Phaseolus vulgarisL.) and maize (Zea maysL.).Copyright 1998 Annals of Botany Company

Photoperiod, temperature, photoperiodxtemperature interaction, phenology, long-day plant, short-day plant, pea (Pisum sativumL.), oat (Avena sativaL.), wheat (Triticum aestivumL.), bean (Phaseolus vulgarisL.), maize (Zea maysL.)


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