Changes in Root Hydraulic Conductivity During Wheat Evolution |
| |
Authors: | Chang-Xing ZHAO Xi-Ping DENG Lun SHAN Ernst STEUDLE Sui-Qi ZHANG Qing YE |
| |
Institution: | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, the Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China;; Lehrstuhl Pflanzenökologie, Universität Bayreuth, Bayreuth D-95440, Germany |
| |
Abstract: | Abstract: A better understanding of the mechanisms of water uptake by plant roots should be vital for improving drought resistance and water use efficiency (WUE). In the present study, we have demonstrated correlations between root system hydraulic conductivity and root characteristics during evolution using six wheat evolution genotypes (solution culture) with different ploidy chromosome sets (Triticum boeoticum Bioss., T. monococcum L.: 2n=2x=14; T. dicoccides Koern., T. dicoccon (Schrank) Schuebl.: 2n = 4x = 28; T. vulgare Vill., T. aestivum L. cv. Xiaoyan No. 6: 2n = 6x = 42). The experimental results showed that significant correlations were found between root system hydraulic conductivity and root characteristics of the materials with the increase in ploidy chromosomes (2x→6x) during wheat evolution. Hydraulic conductivity of the wheat root system at the whole-plant level was increased with chromosome ploidy during evolution, which was positively correlated with hydraulic conductivity of single roots, whole plant biomass, root average diameter, and root growth (length, area), whereas the root/shoot ratio had an inverse correlation with the hydraulic conductivity of root system with increasing chromosome ploidy during wheat evolution. Therefore, it is concluded that that the water uptake ability of wheat roots was strengthened from wild to modern cultivated species during evolution, which will provide scientific evidence for genetic breeding to improve the WUE of wheat by genetic engineering. (Managing editor: Ya-Qin HAN) |
| |
Keywords: | chromosome ploidy drought resistance hydraulic conductivity root system water uptake water use efficiency wheat evolution |
本文献已被 维普 等数据库收录! |
|