DEVELOPMENT OF PHOTOSYNTHETIC ABILITY OF HYBRID WALNUT PLANTLETS DURING ACCLIMATIZATION

D. Chenevard, J.S. Frossard, M. Gendraud, C. Jay-Allemand
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.
Chenevard, D., Frossard, J.S., Gendraud, M. and Jay-Allemand, C. (1997). DEVELOPMENT OF PHOTOSYNTHETIC ABILITY OF HYBRID WALNUT PLANTLETS DURING ACCLIMATIZATION. Acta Hortic. 442, 163-168
DOI: 10.17660/ActaHortic.1997.442.22
https://doi.org/10.17660/ActaHortic.1997.442.22

Acta Horticulturae