As you know, the phenotypic plasticity is most widely studied in truss rather than in crop plants.
Does anyone know how plasticity index should be calculated for phenotypic data derived from various environments in crops?
What are you talking about species.
Could you specify your question more
Plasticity index was estimated according to Valladares et al., 2006; This index takes values between 0 (no plasticity) to 1 (high plasticity) and is based on phenotypic distances between different leaves exposed to different tretment, summarized in an index of relative distance plasticity (RDPis).
see
Valladares F., Sánchez D., Zavala M. 2006. Quantitative estimation of phenotypic plasticity. Journal of Ecology 94: 1103-1116.
Phenotypic plasticity can be calculated as ratio of variance of the trait for each variety to overall variance of the population of varieties
Rajbir Yadav is correct. See - Dingemanse 2010 Behavioural reaction norms
This R code might be useful.
https://github.com/ameztegui/Plasticity
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