Photosynthetica 2012, 50(1):49-55 | DOI: 10.1007/s11099-012-0008-8

The photosynthetic stress responses of five pepper species are consistent with their genetic variability

L. J. Ou1,2, X. X. Zou1,3,*
1 School of Biological Science and Technology, Central South University, Hunan Changsha, China
2 Department of Life Sciences, Huaihua University, Hunan Huaihua, China
3 Vegetable Institution of Hunan Academy of Agricultural Science, Hunan Changsha, China

The aim of the study was to investigate the genetic distances and their relationships among pepper species using photosynthetic features under different stresses and genetic variability. The photosynthetic features under drought, waterlogging and low-temperature stresses, rDNA internal transcribed spacer (ITS) sequences of nuclear genome and trnH-psbA sequence of chloroplast genome of 25 varieties from 5 pepper species Capsicum annuum L. (CA), Capsicum baccatum L. (CB), Capsicum chinense Jacquin. (CC), Capsicum frutescens L. (CF) and Capsicum pubescens Ruiz & Pavon (CP) were analyzed and used to construct the dendrograms. The results showed the photosynthetic rate of different pepper species could be greatly but differentially decreased by stresses. For example, CB and CF had the smallest and the highest decrease to drought, CC had the highest decrease to waterlogging, and CP had the smallest decrease to low temperature. The ITS sequences of 25 pepper varieties are 591-619 bp in length and have GC% between 51.1% and 64.5%. Their trnH-psbA sequences are 537-558 bp in length and have GC% between 27.2% and 28.5%. The cluster analysis of the five pepper species based on the changes in P N under stresses is similar to that based on genetic variability, that is, CP clusters with CB, and CC clusters with CA after first clusters with CF. In addition, the clustering methods based on the photosynthetic stress responses and genetic variability are unable to completely distinguish pepper varieties within the same species. The results indicate that similarly to genetic variability, changes in P N under stresses (specifically the stress corresponding to the climate of plant's original habitat) could be used to identify genetic distance of pepper species.

Keywords: gene sequence; pepper species; photosynthetic rate; stresses

Received: June 12, 2011; Accepted: December 3, 2011; Published: March 1, 2012Show citation

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Ou, L.J., & Zou, X.X. (2012). The photosynthetic stress responses of five pepper species are consistent with their genetic variability. Photosynthetica, 50(1), 49-55. doi: 10.1007/s11099-012-0008-8.
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