Improvement of acclimatization of micropropagated grapevine: photosynthetic competence and carbon allocation
1999
Amancio, S. | Rebordao, J.P. | Chaves, M.M.
Grapevine plantlets multiplied in vitro were acclimatized at 40 or 90 micromol m(-2) s(-1) photon flux density for 12 or 16 h per day, respectively. In the high-light regime a decrease in total chlorophyll and an increase in chlorophyll a/chlorophyll b ratio occurred. However at high-light intensity lower photosynthetic capacities and higher apparent photosynthesis were measured than at the low-light regime. In leaves expanded during acclimatization, the light compensation point was higher in plantlets under high-light while quantum yield was higher in low-light conditions. High-light also gave rise to an increase in carbohydrate concentration. As a whole, the results suggest that high-light increases carbon assimilation and growth although with a low investment in the photosynthetic apparatus.
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