J.G. Li, H.L. Zhang, J. Gao, X.Q. Zhao, Z.H. Wang, S.Q. Lin
A cultivated loquat (Eriobotrya japonica Lindl.) cultivar (‘Jiefangzhong’) and two wild loquat species (E. prinoides Rehd & Wils and its variant dadunensis H.Z. Zhang) were used as materials for comparative study of photosynthesis. Their diurnal changes in leaf net photosynthetic rate (Pn), stomatal conductivity (Gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr) were traced in spring, summer, autumn and winter. The curves of diurnal Pn changes were generally single-peaked, but those in the wild loquat species in summer and ‘Jiafangzhong’ in winter exhibited double peaks. In general, the maximum Pn value or the first peak occurred at 10:00am in spring, summer and autumn and at 11:00am in winter. The active photosynthetic period in a day was from 9:00am to 3:00pm in winter and from 8:00am to 4:00pm in the other seasons. The diurnal changes in Gs in cultivated and wild loquat species in different seasons exhibited almost the same trend with the Pn changes. Pn and Gs values in spring and summer were generally higher than those in autumn and winter, and the Pn in winter was the lowest. The diurnal Tr changes showed single peak curves in all seasons, with the maximum Tr value ocurring two to four hours later than the Pn peaks. Compared with the wild species, E. japonica cv. ‘Jiefangzhong’ had higher Pn, Gs and Tr in summer and autumn. Although the general trend of the diurnal Ci changes was contrary to the Pn changes in all tested loquats and in all seasons, the range of Ci changes in the active photosynthetic period in a day was narrow, indicating that non-stomatal factors contributed to the Pn changes.
Li, J.G., Zhang, H.L., Gao, J., Zhao, X.Q., Wang, Z.H. and Lin, S.Q. (2007). A COMPARATIVE STUDY ON PHOTOSYNTHESIS BETWEEN CULTIVATED AND WILD LOQUATS. Acta Hortic. 750, 377-380
DOI: 10.17660/ActaHortic.2007.750.60
Eriobotrya japonica, E. prinoides, E. prinoides var. dadunensis

Acta Horticulturae