Energy status during development and ripening of litchi fruit. (A) Adenosine triphosphate (ATP); (B) adenosine diphosphate (ADP); (C) adenosine monophosphate (AMP); (D) total adenylate; (E) energy charge (EC); and (F) ratio of ATP/AMP. Contents of ATP, ADP, AMP and total adenylate are expressed as μg g-1 FW. FW, fresh weight. Data are the mean ± standard deviation (n = 3). Means with same letter are not significantly different (p < 0.05) among the different developmental stages.