Evaluation of Freezing Tolerance in Loquat Young Fruit Based on the Survival Percentage of Fruit Clusters After Cold Spell
This study utilized a hybrid offspring population as its experimental material.The survival of young fruits was investigated based on conspicuous differences in fruit size between frozen-injured and surviving young fruits during the fruit enlargement period.The number of survived young fruits per plant(variable X),the average number of survived young fruits per fruit cluster(variable Y),and the percentage of survived fruit clusters(variable Z)were custom-defined and transformed into three data samples.The kurtosis,skewness,and probability density distribution functions of each sample indicated that variable Z exhibited a closer approximation to a normal distribution compared with X or Y.Following Box-Cox transformation,variablesY and Z successfully passed the Shapiro-Wilk test,confirming their adherence to a normal distribution.The optimal values for parameters used in the definitions of Y and Z were determined by introducing the variable S,which assessed the degree to which the data conformed to a normal distribution and maintained a relatively large sample size.The findings revealed that setting parameter a(the expected yield)to 4 and parameter b(the number of fruit clusters)to 12 yielded data samples of the average number of survived fruit clusters(Y)and the percentage of survived fruit clusters(Z)that most closely aligned with a normal distribution while maximizing the sample size.At this juncture,the Box-Cox transformation of the(Y)variable was deemed inconsequential,whereas the transformation of the(Z)variable coincidentally corresponded to a logarithmic transformation.The results of this study suggest that the percentage of survived fruit clusters(Z)can effectively reflect both freezing tolerance and yield,with data acquisition being simple and efficient,thus rendering it suitable for large-scale freezing tolerance evaluation in loquat hybrid offspring.
loquatbreedingyoung fruitrecovery growth methodfreezing toleranceevaluationnormal distribution
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