Seasonal changes in sugars, starch, nitrogen and C:N ratio in relation to flowering in mango.
Suryanarayana V.
Author Affiliation: Tamilnadu Agricultural University, Coimbatore, India.
Plant Biochemical Journal 5 : 108-117
Abstract : The changes were studied in the shoots of irregular bearing cvs Mulgoa and Banganapalli and the regular bearing cvs Neelum and Bangalora for 2 seasons. Glucose and fructose contents decreased in shoots of all cvs at the time of flower bud formation (FBF), but during inflorescence development and emergence the contents of these sugars rose sharply. The mean values for these sugars in the shoots were higher in the year of normal flowering than in the year of subnormal flowering. In all cvs sucrose content of the shoots gradually increased at first during the season, reaching the highest level at FBF, and thereafter declined. Values for sucrose were higher during a normal flowering year. The starch content also attained the highest level at FBF and accumulation was greater in a normal than in a subnormal year. Although the N contents were higher in the normal than in the subnormal year, no relationship was found between N content or the C:N ratio with FBF or the number of flowers.