DIFFERENCES IN LEAF PIGMENT COMPOSITION, PHOTOSYNTHETIC RATES AND CHLOROPHYLL A FLUORESCENCE OF TWO PEAR CULTIVARS AFTER SUDDEN DROP IN TEMPERATURE

The purposes of this study were to identify different ecophysiological responses of two pear cultivars (‘Ninglv’ and ‘Huanghua’) to sudden chilling; to reveal the underlying mechanisms and to provide some theoretical bases to select high tolerant varieties.
In this study, the leaf pigment composition, chlorophyll fluorescence parameters and photosynthetic rates of two pear cultivars were measured under field conditions after sudden drop in temperature.
The results showed that ‘Ninglv’ pear had higher chlorophyll content, the maximum photochemical efficiency of PSII (Fv/Fm), photochemical quenching of PSII (qP), maximum activity of PSII (Fv/Fo) as well as electron transport rate (ETR), actual quantum yield of PSII photochemistry (ΦPSII), net photosynthetic rate (Pn) and Pn/ΦPSII ratio.
It indicated that the ‘Ninglv’ cultivar had higher photosynthetic capacity, PSII photochemical efficiency and stronger low-temperature tolerance than ‘Huanghua’ cultivar.

XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on the Challenge for a Sustainable Production, Protection and Consumption of Mediterranean Fruits and Nuts

Z. Wang, Y. Chang, J. Lin, X. Li, Q. Yang

pigment, photosynthetic rates, chlorophyll a fluorescence, pear, temperature

https://doi.org/10.17660/ActaHortic.2012.940.72