Improved drought resistance by intergeneric graftingin Salicaceae plants under water deficits

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Han , Q , Luo , J , Li , Z , Korpelainen , H & Li , C 2018 , ' Improved drought resistance by intergeneric graftingin Salicaceae plants under water deficits ' , Environmental and Experimental Botany , vol. 155 , pp. 217-225 . https://doi.org/10.1016/j.envexpbot.2018.07.003

Title: Improved drought resistance by intergeneric graftingin Salicaceae plants under water deficits
Author: Han, Qingquan; Luo, Jianxun; Li, Zhijun; Korpelainen, Helena; Li, Chunyang
Contributor: University of Helsinki, Department of Agricultural Sciences
Date: 2018-11
Language: eng
Number of pages: 9
Belongs to series: Environmental and Experimental Botany
ISSN: 0098-8472
URI: http://hdl.handle.net/10138/307840
Abstract: In this study, intergeneric grafting was employed between Populus cathayana and Salix rehderiana to investigate the grafting compatibility of the two Salicaceae plants and to reveal whether grafting can improve their drought resistance. Under different grafting combinations (P. cathayana scion with P. cathayana rootstock, P/P; P. cathayana scion with S. rehderiana rootstock, P/S; S. rehderiana scion with S. rehderiana rootstock, S/S; and S. rehderiana scion with P. cathayana rootstock, S/P), the survival and growth rate, biomass accumulation and allocation, photosynthetic traits, carbon isotope composition (delta C-13), relative water content (RWC) and nonstructural carbohydrates (NSCs) were measured. The results showed that the grafting compatibility between P. cathayana and S. rehderiana was very high, as the survival rates ranged from 76% to 100% under different grafting combinations. Drought significantly decreased growth, biomass accumulation, photosynthetic pigment contents, net photosynthesis rates (P) and RWC, and increased delta C-13 in all grafting combinations. Under drought stress, biomass accumulation, total chlorophyll, transpiration rate (E) and P-n were higher in P/P and P/S than in S/S and S/P. Compared with P/P, the growth rate, biomass accumulation, root/aboveground ratio (R/A ratio), carotenoid, RWC, starch and total soluble sugar (TSS) of P/S were less affected by drought. The height growth rate (GRH), R/A ratio, carotenoid, chlorophyll a, total chlorophyll, WUEi and TSS of S/P were lower than those of S/S under water-limited conditions. Moreover, a principal component analysis indicated that P/S and S/S had higher drought resistance than P/P and S/P under water deficits. The used method allows combining specific advantageous traits from P. cathayana and S. rehderiana, which may be a highly useful tool to enhance drought resistance in the cultivation of Salicaceae plants.
Subject: Intergeneric grafting
Drought resistance
Photosynthesis
Water use efficiency
Non-structural carbohydrates
POPULUS-CATHAYANA MALES
USE EFFICIENCY
CHLOROPHYLL FLUORESCENCE
CARBOHYDRATE DYNAMICS
GROWTH
RESPONSES
STRESS
ROOTSTOCKS
MORTALITY
BIOMASS
1172 Environmental sciences
1181 Ecology, evolutionary biology
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