The Analysis of Reciprocal Transfer Experiments to Estimate the Durations of the Photoperiod-sensitive and Photoperiod-insensitive Phases of Plant Development: An Example in Soya Bean

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Abstract
Plants of the quantitative short-day crop soya bean [Glycine max (L) Merrill] cv Davis were grown in a plastic house in a diurnally alternating temperature regime (30/20 °C) and transferred from a long- (16–18 h d−1) to a short-day regime (12 h d−1) and vice versa at various times after sowing Photoperiod influenced the period from sowing to flowering, for example, a delay of about 50 d between the long- and short-day controls A model was developed so as to enable the complete data set to be analysed simultaneously in order to estimate the durations of the photopenod-insensitive pre-inductive phase (a1), the photoperiod-sensitive inductive phase in the short- (Is) and long-day (IL) regimes, and the photoperiod-insensitive post-inductive phase (a3) of plant development The model was fitted using the FITNONLINEAR directive of GENSTAT V and it described the observations well (adjusted R2 = 0–913), the fitted values were a1 = 17 7 d (se 0.57), Is − 6 5 d (s e 0.99), IL = 55 4 d (se 281), and u3 = 19 5 d (se 0.93) The analytical procedure developed is applicable to reciprocal transfer experiments in other flowering plant species The estimate of a1 for cv Davis is substantially greater than a previously published estimate for this cultivar, and leads us to question the widespread assumption that all soya bean cultivars respond to photoperiod soon after emergence

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