Individual soluble carbohydrate content of leaf

Fig. 4. Radioactivity (% of total soluble carbohydrate radioactivity) associated with AM679 in (a) labelled ‘Hortgem Tahi’ leaf blades from potted plants early in fruit development and (b) the associated labelled leaf petioles: sucrose (▽), planteose (▲), myo-inositol (□) and galactinol (■). Data are means ± SEM, n = 4.Figure optionsDownload full-size imageDownload as PowerPoint slide
Radioactivity associated with the soluble carbohydrates was also measured in sections of shoot rootward and shootward from the labelled leaf. Sucrose was the major soluble carbohydrate present in the shoot followed by planteose, with lesser amounts of fructose, glucose, myo-inositol and then galactinol (data not shown). Amounts of radiolabelled sucrose (48.0%) and planteose (48.0%) were detectable and not significantly different in the shoot tip throughout the six hour period. Three hours after radiolabelling, of the total soluble carbohydrates quantified in the shoot segment 50–100 mm from the labelled leaf, the radioactivity in sucrose (53.5%) was significantly (P < 0.05) higher than that in planteose (46.5%).