Photosynthetica 2018, 56(2):578-590 | DOI: 10.1007/s11099-017-0704-5

Adaptive photosynthetic and physiological responses to drought and rewatering in triploid Populus populations

T. Liao1,2,3, Y. Wang1,2,3, C. P. Xu1,2,3, Y. Li1,2,3, X. Y. Kang1,2,3,*
1 National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
2 Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China
3 Beijing Laboratory of Urban and Rural Ecological Environment, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China

Cuttings of Populus cathayana Rehd, originating from three triploid and one diploid populations with the same parents but different gamete origins, were used to examine physiological responses to drought stress and rewatering by exposure to three progressive water regimes. Progressive drought stress significantly decreased the leaf relative water content (RWC), photosynthesis, and chlorophyll fluorescence parameters, and increased the relative electrolyte leakage, malondialdehyde (MDA), free proline (Pro), and antioxidant enzymes, such as superoxide dismutase, peroxidase, and catalase, in the four populations evaluated. However, compared to the diploid population, triploid populations showed lower relative electrolyte leakage and MDA, higher RWC and Pro content, and more efficient photosynthesis and antioxidant systems under the same water regime. Our data indicated that triploid populations possessed more efficient protective mechanisms than that of diploid population with gradually increasing drought stress. Moreover, some triploid genotypes were less tolerant to water stress than that of diploids due to large intrapopulation overlap.

Keywords: chlorophyll fluorescence gas exchange; malondialdehyde; poplar; population; stomatal limitation; water deficit

Received: June 12, 2016; Accepted: November 7, 2016; Published: June 1, 2018Show citation

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Liao, T., Wang, Y., Xu, C.P., Li, Y., & Kang, X.Y. (2018). Adaptive photosynthetic and physiological responses to drought and rewatering in triploid Populus populations. Photosynthetica, 56(2), 578-590. doi: 10.1007/s11099-017-0704-5.
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