Root growth and dry matter partitioning of cauliflower under drought stress conditions:: measurement and simulation
Root growth and dry matter partitioning of cauliflower under drought stress conditions:: measurement and simulation
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DOI：
10.1016/s1161-0301(03)00061-3
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发表时间：
2004-04-01
影响因子：
5.2
通讯作者：
Stützel, H
中科院分区：
文献类型：
--
作者：
Kage, H;Kochler, M;Stützel, H
通过田间和容器试验，研究了干旱胁迫下花椰菜根系生长和干物质分配的变化。干旱胁迫不影响茎叶干物质和地上部与主根干物质的异速生长关系。然而，干旱胁迫对凝乳的库强度产生了影响，从而延迟了凝乳的生长，并且凝乳干物质生产比总干物质更严重地受到有限供水的抑制。干旱胁迫并没有改变地上部干物质和总根长之间的线性关系，然而，花椰菜的比根长较低，干旱胁迫条件下导致更高的干物质沉积在细根部分。在干旱胁迫条件下，每度日的生根深度垂直生长量几乎增加一倍。采用现有的花椰菜干物质分配模型，包括干旱胁迫对干物质分配到花球的影响。因此，在春化期间，凝乳的库强度的初始增加取决于植物的相对生长速率。此外，采用一个简单的描述性根系生长模型，包括干旱胁迫对根系生长的影响。为此目的，每度日的生根深度和比根长的增加取决于根际土壤剖面中的平均土壤水势。以总干物质生产率为输入值，模型能较好地预测干物质分配，并能较好地描述花椰菜根长分布。(C)2003 Elsevier B.V.保留所有权利。
Field and container experiments were carried out in order to quantify root growth and dry matter partitioning of cauliflower under drought stress conditions. Drought stress did not influence allometric relationships between leaf and stem dry matter and shoot and tap root dry matter. Drought stress, however, had an impact on the sink strength of the curd, thereby curd growth was delayed and curd dry matter production was more seriously depressed by a limited water supply than total dry matter. Drought stress did not modify a linear relationship between shoot dry matter and total root length, however, the specific root length of Cauliflower was lower under drought stress conditions leading to a higher dry matter deposition in the fine root fraction. Also the vertical increment of rooting depth per degree day almost doubled Under drought stress conditions. An existing model for dry matter partitioning in cauliflower was adopted to include the effects of drought stress on dry matter partitioning to the curd. Therefore, the initial increase of the curd's sink strength was made dependent on the plants relative growth rate during the vernalisation period. Furthermore, a simple descriptive root growth model was adopted to include drought stress impact on root growth. For this purpose the increase of rooting depth per degree day and the specific root length were made dependent on the average soil water potential in the rooted soil profile. The modified model modules predicted dry matter partitioning and described the root length distribution of cauliflower Sufficiently well using total dry matter production rate as input values. (C) 2003 Elsevier B.V. All rights reserved.