The influence of climatic conditions on the physiological activity of some Chinese jujube genotypes grown on the sandy soils of southwestern Romania

This paper presents results regarding the physiological behavior of some Ziziphus jujuba Mill. genotypes cultivated on the sandy soils of southwestern Romania at Dăbuleni Research & Development Station for Plant Cultivation on Sandy Soils.
The studies were carried on the ‘Lii’, ‘Lang’, ‘Tigertooth’, and ‘L5’ genotypes, for evaluation of the plant photosynthetic capacity, transpiration intensity, stomata opening and chlorophyll content index closely correlated with air temperature, active solar radiation, air pressure and relative air humidity.
The results demonstrated the high resistance of the ‘Lang’ genotype to increased thermo hydric stress.
At temperatures of 42.7-45.9°C, recorded at the leaves level, the photosynthesis process did not stop, and the values of net photosynthesis varied between 6.51 µmol CO₂ m^-2 s^-1 at the ‘Tigertooth’ genotype and 11.70 µmol CO₂ m^-2 s^-1 at the ‘Lang’ genotype.
The data showed that, to avoid overheating, jujube trees have intensified their transpiration process.
Positive correlations, statistically ensured, were established between the air temperature values and the transpiration rate.

VI International Jujube Symposium

A. Diaconu, F. Stănică, A.N. Paraschiv, I. Titirică, Ș. Nanu, C. Bîrsoghe

Ziziphus jujuba Mill., cultivars, termo-hydric stress, photosynthesis, transpiration

https://doi.org/10.17660/ActaHortic.2025.1436.10