There have been numerous
studies investigating the physical, bio-chemical and physiological
changes of several fruits during growth and development. Several
mango fruit is harvested before the onset of the climacteric but,
when physiologically mature stage at 105-112 days after fruit set,
to get optimum fruit quality, whereas immature fruit do not ripen
normally [4]. The suitablematurity forharvesting Jinhwang cultivar
at 120 to 130 days after anthesis (DAA) [5]. TSS increases slightly at
the mature-green stage. The firmness of the fruit remains almost
constant throughout the growth period and fruit become less firm
after maturity [4]. Starch accumulation is a major chemical change
in mango fruit during growth and maturation [6].
Total sugars (sucrose, fructose, glucose) are one of the biochemical
components of fruit quality [7] which is related to sink
strength and is important in fruit development [8]. Increase in
total sugar content during fruit maturity is dependent sucrose accumulation [9]. Several enzymes are involved in sucrose
metabolism [10]; Sucrose phosphate synthase (SPS; EC 2.4.1.14) is
a soluble enzyme located in the cytoplasm and plays a major role in
control of sucrose biosynthesis because the hydrolysis of sucrose
phosphate by an accompanying specific phosphatase renders the
synthetic irreversible reaction in favour of sucrose accumulation
[11]. Sucrose synthase (SS; EC 2.4.1.13) and invertases (AI, NI; EC
3.2.1.26) are sucrose-cleaving enzymes important for determining
sink strength [10].