ISHS Acta Horticulturae 442: III International Walnut Congress
DEVELOPMENT OF PHOTOSYNTHETIC ABILITY OF HYBRID WALNUT PLANTLETS DURING ACCLIMATIZATION |
| Authors: | D. Chenevard, J.S. Frossard, M. Gendraud, C. Jay-Allemand |
| Abstract:
Growth, carbohydrate content and gas exchange were studied in hybrid walnut plantlets (Juglans nigra n° 23 x Juglans regia) during acclimatization in a growth chamber. The acclimatization was conducted during 28 days at 28/25°C (day/night temperature). During the first seven days, respiration was higher than photosynthesis (gas exchange calculated on a daily basis); growth and maintenance processes appeared to be chiefly supplied by the carbohydrates which were stored in the callus and roots during the in vitro phase. From day 8 to day 28, the daily balance of gas exchange was positive; the plantlet was autotrophic for carbon. In spite of that, the carbohydrate content of the plantlet was very low at the end of the acclimatization phase. | |
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