Drought-induced changes in rooting patterns and assimilate partitioning between root and shoot in upland rice
Drought-induced changes in rooting patterns and assimilate partitioning between root and shoot in upland rice
复制标题
干旱引起的旱稻生根模式和根茎分配的变化
DOI：
10.1016/j.fcr.2004.10.002
复制
发表时间：
2005-09-14
影响因子：
5.8
通讯作者：
Audebert, A
中科院分区：
文献类型：
--
作者：
Asch, F;Dingkuhn, M;Audebert, A
干旱是影响受污染水稻系统的主要压力。根长密度、根粗、生根深度和分布等根系特征已被确定为抗旱性的构成因子。深根品种比浅根品种更耐旱。本研究旨在定量研究不同干旱程度对3个水稻品种CG 14、WAB 56 - 104和WAB 56 -104干物质分配和根系发育的影响。sativa tropical joponica，改良）和WAB 450 -24-3-2-P18-HB（CG 14 × WAB 56 -104杂种）。在象牙海岸Mbe的西非水稻发展协会，在不同程度的干旱胁迫下进行了两个实验的同化物分配下的避雨棚。含有约25 kg桑迪壤土的PVC管（直径= 0.2 m，高0.6 m）用于干旱胁迫实验。对于生根深度和根分布的研究，管被细分为四个车厢的0.15米。在第一次试验中，将具有WAB 56 -104的管逐渐干旱至五个水平的土壤水分含量，此后保持恒定。在第二次试验中，所有品种的植物经受三种干旱处理：（1）恒定的田间持水量的土壤水分含量（约22%的水分含量），（2）恒定的土壤水分含量14%（约-0.5MPa的土壤基质势）和（3）恒定的土壤水分含量9%（约-1MPa的土壤基质势）。水稻对干旱胁迫的反应表现为株高、叶面积和生物量减少，分蘖败育，根系干物质和生根深度变化，生殖发育延迟。根和地上部之间的同化物分配，确定从干物质的变化，不受干旱的影响时，植物逐渐强调。在任何情况下，额外的生物量被分配到根，相反，干物质分配到根完全停止严重胁迫下。由于采用的灌溉技术，土壤水分垂直分布变化不大，但在干旱胁迫下根系生长更深。这对于高地适应的WAB 56 -104来说尤其如此。讨论了高地系统干旱响应模型的意义。(c)2004 Elsevier B. V.保留所有权利。
Drought is a major stress affecting tainted rice systems. Root characteristics such as root length density, root thickness, and rooting depth and distribution have been established as constituting factors of drought resistance. Deep rooting cultivars are more resistant to drought than those with shallow root systems. The present study sought to quantify the effects of different levels of drought on dry matter partitioning and root development of three rice cultivars CG14 (Oryza glaberrima), WAB56-104 (O. sativa tropical joponica, improved) and WAB450-24-3-2-P18-HB (CG14 x WAB56-104 hybrid). Two experiments on assimilate partitioning under different levels of drought stress were conducted under rain shelters at the West Africa Rice Development Association, Mbe, Ivory Coast. PVC tubes (diameter = 0.2 m, height 0.6 m) containing about 25 kg of sandy loam were used for the drought stress experiments. For rooting depth and root distribution studies, the tubes were subdivided into four compartments of 0.15 m each. In the first trial, tubes with WAB56-104 were gradually droughted to five levels of soil moisture content that were kept constant thereafter. In the second trial, plants of all cultivars were subjected to three drought treatments: (1) constant soil moisture content at field capacity (about 22% moisture content), (2) constant soil moisture content of 14% (about -0.5 MPa soil matrix potential) and (3) constant soil moisture content of 9% (about - 1 MPa soil matrix potential). Rice reacted to drought stress with reductions in height, leaf area and biomass production, tiller abortion, changes in root dry matter and rooting depth and a delay in reproductive development. Assimilate partitioning between root and shoot, determined from changes in dry matter, was not affected by drought when the plants were gradually stressed. In no case, additional biomass was partitioned to the roots; on the contrary, dry matter partitioning to the root completely ceased under severe stress. Due to the irrigation technique used, vertical soil moisture distribution varied little, but roots grew deeper under drought stress. This was particularly the case for the upland adapted WAB56-104. Implication for modeling of drought responses in upland rice systems is discussed. (c) 2004 Elsevier B.V. All rights reserved.