biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 55:285-290, 2011 | DOI: 10.1007/s10535-011-0040-8

Improving cucumber photosynthetic capacity under NaCl stress by grafting onto two salt-tolerant pumpkin rootstocks

Y. Huang1, Z. L. Bie1,*, Z. X. Liu1, A. Zhen1, X. R. Jiao1
1 College of Horticulture and Forestry, Huazhong Agricultural University/Key Laboratory of Horticultural Plant Biology, Ministry of Education, Wuhan, P.R. China

Cucumber plants were either self-grafted or grafted onto two salt-tolerant pumpkin rootstocks Chaojiquanwang (Cucurbita moschata Duch), and Figleaf Gourd (Cucurbita ficifolia Bouche). Plants were grown hydroponically in 0, 30, 60, or 90 mM NaCl for 16 d in greenhouse. Salinity induced a smaller decrease in plant shoot dry mass, leaf area, net photosynthetic rate, and stomatal conductance in the two rootstock-grafted plants compared to the self-grafted plants. In addition, a significant increase in intercellular CO2 concentration, as well as a significant decrease in the initial and total ribulose-1,5-bisphosphate carboxylase/oxygenase activities were observed only in the self-grafted plants under 90 mM NaCl treatment. These results suggest that the use of salt tolerant rootstock can improve cucumber photosynthetic capacity under salt stress through both stomatal and non-stomatal pathways.

Keywords: Cucumis sativus; Cucurbita ficifolia; Cucurbita moschata; net photosynthetic rate; salinity; stomatal limitation

Received: April 19, 2010; Accepted: June 21, 2010; Published: June 1, 2011  Show citation

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Huang, Y., Bie, Z.L., Liu, Z.X., Zhen, A., & Jiao, X.R. (2011). Improving cucumber photosynthetic capacity under NaCl stress by grafting onto two salt-tolerant pumpkin rootstocks. Biologia plantarum, 55(2), 285-290. doi: 10.1007/s10535-011-0040-8
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