Metabolic importance of starch in the acclimation of plantain CEMSA 3/4 (AAB) plants.

Abstract:

Morphological and physiologica parameters, and starch accumulation during the acclimatization of plantain (CEMSA 3/4, AAB) plants cultured in temporary immersion bioreactors. The plants to be acclimatized were maintained in a growth chamber at 28±1 C and 80-90% relative humidity. The growth parameters were evaluated every 7 days for 63 days of acclimatization. The plants exhibited maximum development on day 35. The number of leaves remained the same after the first 7 days. Leaf length and width increased throughout acclimatization. Rhizome diameter reached its peak on day 35, whereas the fresh weight attained its peak on the last week of acclimatization. The dry weight remained the same after day 21. The number of roots remained the same throughout acclimatization. The survival rate was 96.5% between day 14 and day 35. Photosynthesis decreased after day 35. Transpiration markedly increased during the first 7 days, then decreased thereafter. Starch accumulation was greater in rhizomes than in leaves. The reduction in starch concentrations during the first 7 days of acclimatization was also greater in rhizomes than in leaves. The starch concentration in the rhizome decreased to levels closer to that in the leaf until day 35. The ADP-glucose pyrophosphorylase [glucose-1-phosphate adenylyltransferase] activity increased starting on day 21. The results indicated that the acclimatization of plantain plants cultured in TIB was completed in 35 days, during which it was neccesary to transplant the plants.

Año de publicación:

2006

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