Influence of drought stress on the leaf morphology and physiological characteristics in blackberry (Rubus L.) seedlings
In the present study, the physiological changes and morphological characteristics were investigated in the leaves of blackberry Boysenberry seedlings subjected to 14-day drought stress by withholding irrigation. The leaf relative water content (RWC), and concentrations of photosynthetic pigments and hydrogen peroxide (H2O2) in leaves were analyzed. The results showed that RWC increased slightly at first and then decreased. H2O2 content changed slightly in leaves of Boysenberry during the experiment period. Drought stress induced significant accumulation of photosynthetic pigments and reached the peak on day 10. Besides, scanning electron microscopy (SEM) revealed a drought-resisting apparent structure in Boysenberry. Drought stress significantly influenced the stoma on the lower epidermis of the leaves. As compared to the control, higher stomatal density was observed under drought conditions. Besides, there were elongated cone-shaped unicellular trichomes densely distributed on the abaxial surface of the lower epidermis. Overall, these results demonstrated that Boysenberry exhibited a certain degree of drought adaption. It was suggested that increased drought tolerance of Boysenberry was due to high stomatal and trichomes density, better accumulation of photosynthetic pigments and maintenance of tissue water contents.
Yang, H.Y., Zhang, C.H., Wu, W.L. and Lyu, L.F. (2019). Influence of drought stress on the leaf morphology and physiological characteristics in blackberry (Rubus L.) seedlings. Acta Hortic. 1265, 27-34
blackberry (Rubus L.), drought stress, leaf morphology, physiological characteristics