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Study on Models of Plant Growth and Fruit Development of Papaya
DAIHongfen, WUXiaming, ZHOUChenping, YANGJunxian, YANGMin, YANGMeizhen, KUANGRuibin, WEIYuerong
Chin Agric Sci Bull ›› 2026, Vol. 42 ›› Issue (21) : 132-140.
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Abbreviation (ISO4): Chin Agric Sci Bull
Editor in chief: Yulong YIN
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Study on Models of Plant Growth and Fruit Development of Papaya
This study was carried out to investigate the patterns of plant growth and fruit development of papaya and to establish mathematical model for high-quality and efficient cultivation and promotion of new varieties. Tissue-cultured seedlings of new papaya cultivars ‘Zihui’ and ‘Huanghuayou’ were planted in March. Growth parameters such as plant height, stem perimeter, longitudinal diameter and transverse diameter of fruit were measured periodically as dependent variables. Logistic growth models were established and the independent variable was growth time. Derived functions of models were growth rate equations. Partial correlation analysis was conducted between dependent variables and independent variables such as growth time, effective accumulated temperature, cumulative sunshine duration, and cumulative relative humidity in order to choose more independent variables for multi-factor growth models. The results showed that the patterns of plants growth and fruits of papaya were “S”-shaped curves and were divided into early, fast-growth and late stage. The Logistic models demonstrated high fitting accuracy (coefficient of determination R2≥0.959). The inflection points of plant and fruit occurred in late June and early July. ‘Huanghuayou’ exhibited higher growth rate than ‘Zihui’ at first, with earlier inflection point and higher maximum growth rate (vm). vm of plant height, stem perimeter, fruit longitudinal diameter, and transverse diameter of ‘Huanghuayou’ were 1.77, 0.33, 0.26, and 0.14 cm/d, which were 1.20, 1.03, 1.04, and 1.27 times of ‘Zihui’. However, the growth rates of all parameters of ‘Zihui’ surpassed ‘Huanghuayou’ at different time after inflection points. The duration of the fast-growth stage of plant height, stem perimeter, fruit longitudinal diameter and transverse diameter of ‘Zihui’ were 113.05, 90.51, 54.09, and 65.52 days, which were 1.17, 0.97, 1.12, and 1.21 times of ‘Huanghuayou’. ‘Huanghuayou’ exhibited greater growth amount of plant height, stem perimeter, and fruit transverse diameter. ‘Zihui’ exhibited greater growth amount of fruit longitudinal diameter due to longer fast-growth stage and the earliest speed-surpassing ‘Huanghuayou’. Cumulative sunshine duration showed more highly significant influence on growth parameters (maximum partial correlation coefficient of 0.948), followed by effective accumulated temperature. Cumulative relative humidity showed little significant effect. Multi-factor models with added meteorological factors demonstrated superior fitting performance (R2≥0.992). In summary, the Logistic growth curve equations and its derivative functions could be used to simulate the growth process of plant and fruit of papaya. Growth parameters are slightly different between ‘Zihui’ and ‘Huanghuayou’. Cumulative sunshine duration and effective accumulated temperature are identified as key meteorological factors. Multi-factor growth models exhibit much better fitting performance.
papaya / Logistic equation / inflection point / fast-growth stage / growth rate / effective accumulated temperature
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