兰州大学机构库 >生命科学学院
旱地作物根源信号的演化及与产量形成的关系
Alternative TitleEvolvement of root-sourced signal and its relation to yield formation in dryland crops
熊友才
Thesis Advisor李凤民
2005-05-12
Degree Grantor兰州大学
Place of Conferral兰州
Degree Name博士
Keyword春小麦 山黧豆 非水力根信号 阈值范围 野生近缘种
Abstract本文以4个小麦野生近缘种、8个不同年代的旱地春小麦品种和1个山黧豆品种为实验材料,盆栽试验和大田试验相结合,研究了在土壤干旱条件下根源信号的特点和可能的进化机制,以及以产量为主要目标、以根系特征为中心的小麦品种对干旱的适应机制。在下面的阐述中,非水力根信号(non-hydraulic root-sourced signal, nHRS)主要是指,在植物遇到水分胁迫时,叶片气孔导度显著下降而叶片水分状况却没有发生显著变化的现象。这是作物对土壤出现初期干旱胁迫所作出的早期预警反应;随着土壤含水量的进一步下降,植物地上部分水分状况显著下降,进一步降低气孔导度,这就是传统意义上的水力信号(hydraulic root signal, HRS)。 主要结果如下: 1. 2001-2002两年盆栽试验对八种代表不同年代的六倍体春小麦品种(Triticum aestivum L.)(古老品种和尚头和金包银,近期品种定西24、高原602和陇春8139-2,现代品种92鉴46、021-128和陇春8275)的根信号特征进行比较,发现土壤水分亏缺引起明显的非水力根信号(nHRS)和水信号(HRS)现象。 2.2003年盆栽试验比较了现代六倍体小麦 (Triticum aestivum L.) 品种(高原602和陇春8139-2)和它们的野生近缘种(二倍体MO1和MO4,四倍体DM22和DM31)的根信号特征,发现在土壤干旱胁迫下不同倍体小麦根信号出现时的土壤含水量范围有显著差异,但相同染色体倍数的基因型有基本相同的根信号特征。3.2002年盆栽试验比较了古老品种和现代品种的非水力气孔敏感性的差异性。可以归纳出非水力气孔敏感性的双“Z”模型。
Other AbstractIn this study, four wheat wild species, eight dryland spring wheat cultivars (Triticum aestivum L.) released in different decades and one grass pea (Lathyrus sativus L.) cultivar were used in both pot-culture experiment and filed experiment, in order to evaluate the feature and evolutional mechanism of root-sourced signal under drying soil, and differential adaptation of wheat crops to drought on the basis of root system characteristics and yield formation. In the following presentation, non-hydraulic root-sourced signal (nHRS) is generally referred to as the significant decrease in stomatal conductance without obvious change in leaf water status. It is the early-warning response made by plants at the beginning of drought stress in soil. Afterwards, further decrease in soil water content significantly would lead to a decrease in leaf water status, and further lower stomatal conductance, which is traditionally defined as hydraulic root signal (HRS). Main results in this study are listed as follows: 1. (Two-year experiment from 2001 to 2002) Root-sourced signals of eight cultivars of spring wheat representing different decades (ancient cultivars Monkhead and Jinbaoyin; recent cultivars Dingxi24, Plateau602 and Longchun8139-2; modern cultivars 92-46, 021-128 and Longchun8275) were presented. 2. (Experiment in 2003)The features of root-sourced signal were compared among modern hexaploid cultivars (Plateau602 and Longchun8139-2) and their wild relatives (diploid MO1 and MO4; tetraploid DM22 and DM31). It suggested that the SWC at which root-sourced signal was triggered in drying soil varied significantly between different ploids, while similar feature of root-sourced signal was found between the cultivars in the same ploid. As described previously, the nHRS was first initiated in hexaploid cultivars Plateau602 and Longchun8139-2 when the SWC decreased up to 70% FWC, and the onset of nHRS did not begin till the SWC up to 58% and 53% FWC in two diploid cultivars and two tetraploid cultivars respectively. Furthermore, at the relevant SWCs of 45%, 42% and 36%, leaf RWC started to decrease significantly in diploid cultivars, tetraploid cultivars and hexaploid respectively, suggesting that the HRS appeared. Therefore, the threshold range of hexaploid was the widest and that of diploid the narrowest. 3. (Experiment in 2002)Non-hydraulic stomatal sensitivity followed the model of double “Z” for different-decade cultivars. The difference in non-hydraulic se...
URL查看原文
Language中文
Document Type学位论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/221261
Collection生命科学学院
Recommended Citation
GB/T 7714
熊友才. 旱地作物根源信号的演化及与产量形成的关系[D]. 兰州. 兰州大学,2005.
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