Passion Fruit Ripening Stages Divided by Logistic Growth Model with Multiple Quantifiable Indicators
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摘要:
目的 探究夏季百香果的生长发育与品质形成规律,并对百香果成熟阶段进行判别。 方法 采用钦蜜9号百香果作为试材,测定其横径、纵径、固酸比、可食率、果皮厚度、硬度等理化指标,利用Logistic生长模型分析理化指标随有效积温增长的变化规律,并应用因子分析法对百香果成熟度进行定量评价,最终划分成熟阶段。 结果 通过观测并记录百香果生长过程,发现其纵径、横径变化趋势符合“慢-快-慢”的生长曲线,分析得出百香果在有效积温达到440 ℃·d时,基本完成果实膨大。随后以固酸比、可食率、果皮厚度、硬度为品质指标,其中固酸比与可食率指标呈现S型增长趋势,果皮厚度与硬度呈现三次函数下降趋势,并且品质指标与有效积温之间存在显著的相关性。利用因子分析方法构建百香果成熟度评价指标IM,采用Logistic生长函数建立百香果成熟度数学模型,模型拟合优度达99.25%,计算得出t1 、t2、t3 等3个生长分界点。最终确定有效积温为475~736 ℃·d时,果实处于果肉增重阶段;有效积温为736~997 ℃·d时,果实处于转色阶段;有效积温为997~ 1200 ℃·d时,果实处于成熟阶段。结论 本研究量化分析了百香果成熟度,能够较好划分果肉增重期、转色期、成熟期三个成熟阶段,为百香果适时机械化采摘与贮藏管理提供依据。 -
关键词:
- 有效积温 /
- 理化指标 /
- 成熟阶段 /
- Logistic生长模型 /
- 钦蜜9号百香果
Abstract:Objective To effectively determine the summer growth and development as well as the fruit formation and maturation of passion fruit applying logistic model was studied. Method Physiochemical parameters including transverse and longitudinal diameters, solid to acid ratio, pulp percentage, pericarp thickness, and firmness of Qinmi No. 9 passion fruit were monitored as the plant grew and fruit developed. A logistic growth model incorporating those quantifiable indicators was evaluated to classify the fruit maturity stages by a factor analysis. Result In terms of longitudinal and transverse diameters, the passion fruit grew in a slow-fast-slow pattern. Once the effective accumulated temperature in growth degree days (GDD) reached 440 ℃·d, the fruit essentially had completed the enlargement stage. Thereafter, the solid to acid ratio and pulp yield of the fruit were in an S-shape trend, while the peel thickness and fruit firmness in a declining cubic function. A significant correlation was observed between the indicators and GDD. With the factor analysis-generated assessment index, IM, the mathematic model built with the logistic growth function showed a high fitting of 99.25% on fruit maturity. Three growth transition points, t1, t2, and t3, distinctively separated the fruit development into (A) the pulp weight gaining stage with a GDD of 475–736 ℃·d, (B) the color-changing stage with a GDD of 736–997 ℃·d, and (C) the ripening stage with a GDD of 997– 1200 ℃·d.Conclusion The analysis based on the selected quantitative physiochemical indicators effectively divided the maturation of Qinmi No. 9 passion fruit into the pulp weight gaining, color-changing, and ripening stages. The result would facilitate the design of automated fruit picking and storage management. -
表 1 外形指标模型各参数取值
Table 1. Values of various parameters in the appearance index model
参数
Parameters模型参数 Model parameters 分界点 Boundary points a b k t1/(℃·d) t2/(℃·d) t3/(℃·d) 横径
Transverse diameter5.3231 ± 1.94870.02008 ± 0.0038756.73 ± 5.38 17.682 83.27 148.857 纵径
Longitudinal diameter3.9525 ± 1.26360.02111 ± 0.0048058.52 ± 5.35 2.717 65.104 127.492 表 2 百香果品质指标拟合情况
Table 2. Fitting of fruit quality indicators
参数
Parameters拟合方程
Fitted equation拟合优度 R2 调整后R2
Adjusted R2可食率 Pulp percentage $ y=\dfrac{0.56}{1+33.29{e}^{-0.006x}} $ 0.985 0.980 固酸比 Solid acid ratio $ y=\dfrac{18.24}{1+90.09{e}^{-0.004x}} $ 0.986 0.981 果皮厚度 Pericarp thickness y=29.40−0.07x+7.79×10−5x2−2.82×10−8x3 0.942 0.908 硬度 Firmness y=202.35−0.11x−2.92×10−4x2+1.47×10−7x3 0.989 0.982 表 3 品质指标的相关性分析
Table 3. Correlations among quality indicators of passion fruit
品质指标
Quality indicators有效积温
GDD可食率
Pulp percentage固酸比
Solid acid ratio果皮厚度
Pericarp thickness/mm硬度
Firmness/N有效积温 GDD 1 可食率 Pulp percentage 0.849** 1 固酸比 Solid acid ratio 0.960** 0.822** 1 果皮厚度 Pericarp thickness −0.587** −0.714** −0.531** 1 硬度 Firmness −0.874** −0.823** −0.866** 0.542** 1 **P<0.01 极显著相关。
** indicates extremely significant correlation at 0.01 level.表 4 成分载荷矩阵和贡献率
Table 4. Load matrix and contribution rates of components
指标 Index 载荷值 Load value F1 F2 F3 F4 初始特征值
Initial eigenvalue3.166 0.561 0.140 0.133 方差贡献率
Variance contribution rate/%79.151 14.024 3.492 3.333 累计方差贡献率
Cumulative variance contribution rate/%79.151 93.174 96.667 100.000 可食率
Pulp percentage0. 948 −0. 039 固酸比
Solid acid ratio0. 915 0. 292 果皮厚度
Pericarp thickness−0. 767 0. 631 硬度
Firmness−0. 918 −0. 276 提取方法为主成分分析法。表中主成分F1~F4分别表示原始变量线性变换后得到的新变量。
Data extraction was based on component analysis. Principal components F1–F4 represent new variables obtained from linear transformation of original variables, respectively.表 5 不同成熟阶段品质指标
Table 5. Quality indicators of passion fruit at stages of maturity
不同成熟阶段
Different maturity stages可食率
Pulp percentage固酸比
Solid acid ratio果皮厚度
Pericarp thickness/mm硬度
Firmness/N果肉增重期
Pulp weight gain period0.224±0.117c 1.471±0.485c 8.86±2.77a 196.4±7.1a 转色期
Color-changed period0.426±0.074b 5.724±1.806b 7.17±0.89b 171.1±9.6b 成熟期
Ripeness period0.543±0.029a 10.217±1.234a 6.23±0.60b 161.2±3.8c -
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