USING MULTIPLICATIVE MODELS TO QUANTIFY STEM ELONGATION RATE IN RESPONSE TO TEMPERATURE AND PHOTOPERIOD A CASE STUDY ON ZAGROS CULTIVAR

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ESHGHI L.; KAMKAR B.; POUR YOUSEF M.

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Journal: Journal of Plant Production Research Year:2013 | Volume:20 | Issue:2 Page(s): 121-143

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Title

USING MULTIPLICATIVE MODELS TO QUANTIFY STEM ELONGATION RATE IN RESPONSE TO TEMPERATURE AND PHOTOPERIOD A CASE STUDY ON ZAGROS CULTIVAR

Author(s)

ESHGHI L. | KAMKAR B. | POUR YOUSEF M. | Issue Writer Certificate

Keywords

WHEATQ2

STEM ELONGATIONQ2

TEMPERATUREQ2

PHOTOPERIODQ2

BIOLOGICAL DAYQ2

Abstract

The first step to quantify crop phenology is precise estimation of the parameters, which affect it. These parameters are mainly TEMPERATURE and PHOTOPERIOD. This study was conducted with seven sowing dates to quantify response of STEM ELONGATION rate (SER) to TEMPERATURE and PHOTOPERIOD in WHEAT (Zagros Cultivar). The regression models fitted to SER against TEMPERATURE were flat, logistic, quadratic, cubic, dent-like, segmented, beta and curve models. Meanwhile, quadratic, negative exponential and segmented models fitted to SER against PHOTOPERIOD (these models were used as 24 combined models to describe SER as a function of photothermal day). Root mean square of errors (RMSE), coefficients of determination and regression coefficients of predicted values versus observed ones were used to find the most appropriate model. Also, the phenological data obtained from an independent experiment were used for independent model evaluation. The results showed that quadratic-quadratic function was the best model to describe SER as a function of both TEMPERATURE and PHOTOPERIOD. Using this function, the base TEMPERATUREs, critical PHOTOPERIOD and PHOTOPERIOD sensitivity coefficient were estimated as 7.06 oC, 14.19 h and 0.02, respectively. Study the effects of TEMPERATURE and PHOTOPERIOD on STEM ELONGATION phase indicated that Zagros cultivar has a quantitative or facultative long-day (LDP) response to PHOTOPERIOD. BIOLOGICAL DAYs required to pass from emergence to STEM ELONGATION and emergence to physiological maturity were estimated as 19.57 and 66.93, respectively.

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APA: Copy

ESHGHI, L., KAMKAR, B., & POUR YOUSEF, M.. (2013). USING MULTIPLICATIVE MODELS TO QUANTIFY STEM ELONGATION RATE IN RESPONSE TO TEMPERATURE AND PHOTOPERIOD A CASE STUDY ON ZAGROS CULTIVAR. JOURNAL OF PLANT PRODUCTION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 20(2), 121-143. SID. https://sid.ir/paper/155708/en

Vancouver: Copy

ESHGHI L., KAMKAR B., POUR YOUSEF M.. USING MULTIPLICATIVE MODELS TO QUANTIFY STEM ELONGATION RATE IN RESPONSE TO TEMPERATURE AND PHOTOPERIOD A CASE STUDY ON ZAGROS CULTIVAR. JOURNAL OF PLANT PRODUCTION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2013;20(2):121-143. Available from: https://sid.ir/paper/155708/en

IEEE: Copy

L. ESHGHI, B. KAMKAR, and M. POUR YOUSEF, “USING MULTIPLICATIVE MODELS TO QUANTIFY STEM ELONGATION RATE IN RESPONSE TO TEMPERATURE AND PHOTOPERIOD A CASE STUDY ON ZAGROS CULTIVAR,” JOURNAL OF PLANT PRODUCTION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 20, no. 2, pp. 121–143, 2013, [Online]. Available: https://sid.ir/paper/155708/en

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