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Non-hydraulic Root-sourced Signal Crosstalk and Its Evolutionary Significance in Dryland Wheats

Author: LiJiNan
Tutor: XiongYouCai
School: Lanzhou University
Course: Ecology
Keywords: Dryland wheat Non - hydraulic root signal Interaction effects Abscisic acid Zeatin Evolutionary significance
CLC: S512.1
Type: Master's thesis
Year: 2011
Downloads: 15
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Abstract

Test conducted at Lanzhou University, Ministry of Education Key Laboratory of Arid and Grassland Ecology the Yuzhong experiment station artificial climate chamber in March 2009 - July 2010, six wheat varieties evolutionary kinship as the experimental samples, including four wild relatives (diploid MO1 and MO4, the tetraploid DM22 and DM31), two hexaploid ancient hexaploid varieties monk head (non-head) and in 1998 developed into modern hexaploid varieties Longchun 8275 (-to-head). Add exogenous abscisic acid (that Miyang23 and N22 were acid, ABA) of zeatin (zeatin, ZR), and CaCl2 solution method, pot experiment measured the root signal under the control of different ploidy wheat seedling growth, water use, gas exchange and leaf ABA and zeatin (ZR) content, the use of multi-factor correlation analysis reveals the physiological and ecological characteristics and interaction effects of the two main causes of signal substances. The study reached the following main conclusions: 1 root signal under the control of different ploidy increase in plant height decreased leaf area showed a decreasing trend, but the big difference between the different varieties. Plant height increase in hexaploid and tetraploid value greater than diploid and hexaploid wheat L8275 largest increase; gradually reduced leaf area, leaf area was significantly decreased in the continuing role of the root signal range, but the root causes decline in leaf area was not significant after the signal disappears. The results show that the root of the signal has a significant inhibitory effect of different ploidy wheat growth regulation. With the soil from slight drought to moderate drought, root signal and continued to play a role of ABA content show a gradual upward trend, but a big difference in the variations of the different varieties. Almost all varieties in 8-12 days (non-hydraulic root signal the end of the point-in-time) ABA content peaked, MO1 in 8-10 days maximum to 129.76 ng / g · fw M04 content in 10-12 days The maximum rise 222.325 ng / g · fw DM22 increased content in 10-12 days maximum 150.225 ng / g · fw the DM31 the maximum increase in the content of 8-10 days to 196,515 ng / g · fw L8275 the maximum increase in the content of 8-10 days to 150.495 ng / g · fw, Monkhead content in 8-10 days maximum rise to 241.89 ng / g · fw after ABA content of various varieties have downward trend. In the root signal continued to play the role of soil moisture range, leaves ZR content show a gradual downward trend, but a big difference in the variations of the different varieties. Under gradual drought stress, with the decline of soil moisture, ZR content in the leaves of wheat seedlings showed a downward trend, MO1 in 10-12 days maximum 8.8 ng / g · fw, MO4 In the 10-12 the content increased day maximum for 12.585rig / g · fw DM22 increased content in 10-12 days maximum to 11.68 ng / g, fw DM31 the maximum increase in the content of 8-10 days for 4.29ng / g · fw, L8275 increased content in 8-10 days maximum 7.875ng / g · fw. Then five species stabilized state. 4. DCCA principal component analysis shows that, for the the ABA terms of, ABA and plant height into positive correlation, and correlation is also increasing with increasing ploidy; ABA and leaf area, stomatal conductance, aboveground biomass in drought stress a negative correlation process; density relationship of ABA and quality from almost nothing to do with increasing ploidy negative correlation. In addition to the head monk for ZR, ZR associated with plant height negative, and negative correlation close to -1. ZR leaf area, stomatal conductance, aboveground biomass was positively correlated with increasing ploidy the ZR and leaf area, stomatal conductance, aboveground biomass drought stress increasingly drought stress greater. MO1, MO4, L8275, Monkhead in the ZR mass density was positively correlated with a positive correlation DM22, DM31. 5. Effect of the interaction between the two main causes of signal ABA and ZR. The principal component analysis showed that there is a certain antagonism between ABA and CTK (ZR).

Non-hydraulic Root-sourced Signal Crosstalk and Its Evolutionary Significance in Dryland Wheats

Abstract

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