Grape berry sugar accumulation

Tattersall, D.B., van Heeswijck, R., Hpj, RB. (1997). Identification and characterisation of a fruit-specific, thaumatin-like protein that accumulates at very high levels in conjunction with the onset of sugar accumulation and berry softening in grapes. Plant Physiol, 114, 759-769... 

When grape plants were sprayed with vanadium sulphate at the time of massive flowering and with grapes about the size of peas, AA concentration in leaves and berries increased appreciably Sugars accumulated in greater con centrations, ripening was accelerated and yield was increased ... 

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