Abstract: 【Objective】 To investigate the dynamic growth processes of hypocotyls of peanut sprouts of different varieties constructed based on growing days,providing support for the efficient production of peanut sprouts. 【Methods】 Using Yuhua 9326,Yuhua 93,Luhua No. 8,and Zhuhua 11 as experimental materials,Logistic models for the dynamic growth of hypocotyl length and hypocotyl fresh weight of peanut sprouts were constructed based on growing days. The precision and accuracy of the models were verified using measured values,and the dynamic growth characteristics of hypocotyls were analyzed by using the characteristic parameters of the models. 【Results】 Extremely significant positive correlations（P<0.01） were observed between growing days and hypocotyl length,growing days and hypocotyl fresh weight,as well as hypocotyl length and hypocotyl fresh weight across all peanut sprouts of different varieties. The hypocotyl length of peanut sprouts of different varieties,as well as the hypocotyl fresh weight of Yuhua 9326,Luhua No. 8 and Zhuhua 11,generally showed a unidirectional increasing “S-shaped” curve with growing days,experiencing three dynamic growth stages of “gradual increase-rapid increase-slow increase”. The determination coefficient（R²） of the Logistic equations for the dynamic growth of hypocotyl length and hypocotyl fresh weight of peanut sprouts constructed based on growing days were all over 0.960 0,with test probabilities all less than 0.000 1,indicating an extremely significant level;the correlation coefficients（r） between measured values and simulated values were all extremely close to 1 ,with measured values evenly distributed on both sides of the simulated curves and closely approaching the simulated curves,demonstrating high goodness of fit. Significant differences were observed in the characteristic parameters of the Logistic models for hypocotyl length and hypocotyl fresh weight of peanut sprouts of different varieties. The average elongation rate and maximum elongation rate of hypocotyl length were Yuhua 93>Luhua No. 8>Yuhua 9326>Zhuhua 11,while the average growth rate and maximum growth rate of hypocotyl fresh weight were Luhua No. 8>Yuhua 93>Yuhua 9326>Zhuhua 11. 【Conclusion】 The Logistic models for the dynamic growth of hypocotyls of peanut sprouts of different varieties constructed based on growth days show an excellent simulation effect with good predictability and interpretability,and can accurately simulate the growth process of the hypocotyl length and hypocotyl fresh weight of peanut sprouts,demonstrating significant practical value.

Key words: Peanut sprouts, Hypocotyl length, Hypocotyl fresh weight, Dynamic growth, Logistic model