Drought adaptation of stay-green sorghum is associated with canopy development, leaf anatomy, root growth, and water uptake.
Drought adaptation of stay-green sorghum is associated with canopy development, leaf anatomy, root growth, and water uptake.
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DOI：
10.1093/jxb/eru232
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发表时间：
2014-11
影响因子：
6.9
通讯作者：
Jordan DR
中科院分区：
文献类型：
--
作者：
Borrell AK;Mullet JE;George-Jaeggli B;van Oosterom EJ;Hammer GL;Klein PE;Jordan DR
持绿性数量性状位点对高粱花后干旱下籽粒产量的正效应是其对水分利用模式影响的紧急后果，其结果来自花前冠层大小的变化。与衰老的高粱相比，持绿高粱植株在水分有限的条件下在灌浆期表现出更绿的叶和茎，从而增加了籽粒产量、籽粒质量和抗倒伏性。保绿基因已定位于Stg 1、Stg 2、Stg 3和Stg 4等多个关键染色体区域，但这些数量性状基因座（QTL）的功能尚不清楚。本研究的目的是显示如何在干旱条件下的粮食产量的Stg QTL的积极影响可以解释为紧急后果的时间和空间的水分利用模式，导致叶面积动态变化的影响。在澳大利亚东南部昆士兰州的一系列田间试验和田间控制试验中种植了一组四个Stg近等基因系（NIL）及其轮回亲本。这些研究表明，4个Stg QTL通过以下方式调节冠层大小：（1）通过增加下部叶片的大小来减少分蘖，（2）限制上部叶片的大小，以及（3）在某些情况下，减少每株叶片的数量。此外，它们还不同程度地影响叶解剖和根的生长。Stg QTL通过多种途径调控冠层发育，导致相当大的发育可塑性。与Stg QTL相关的冠层大小的减少减少了开花前的需水量，从而增加了灌浆期间的水分供应，并最终提高了籽粒产量。该持绿性状的一般生理机制表明，类似的Stg QTL可以增强其他主要谷物如玉米、小麦和水稻的花后干旱适应。
The positive effects of stay-green quantitative trait loci on grain yield of sorghum under post-anthesis drought are emergent consequences of their effects on water-use patterns, resulting from changes in pre-anthesis canopy size. Stay-green sorghum plants exhibit greener leaves and stems during the grain-filling period under water-limited conditions compared with their senescent counterparts, resulting in increased grain yield, grain mass, and lodging resistance. Stay-green has been mapped to a number of key chromosomal regions, including Stg1, Stg2, Stg3, and Stg4, but the functions of these individual quantitative trait loci (QTLs) remain unclear. The objective of this study was to show how positive effects of Stg QTLs on grain yield under drought can be explained as emergent consequences of their effects on temporal and spatial water-use patterns that result from changes in leaf-area dynamics. A set of four Stg near-isogenic lines (NILs) and their recurrent parent were grown in a range of field and semicontrolled experiments in southeast Queensland, Australia. These studies showed that the four Stg QTLs regulate canopy size by: (1) reducing tillering via increased size of lower leaves, (2) constraining the size of the upper leaves; and (3) in some cases, decreasing the number of leaves per culm. In addition, they variously affect leaf anatomy and root growth. The multiple pathways by which Stg QTLs modulate canopy development can result in considerable developmental plasticity. The reduction in canopy size associated with Stg QTLs reduced pre-flowering water demand, thereby increasing water availability during grain filling and, ultimately, grain yield. The generic physiological mechanisms underlying the stay-green trait suggest that similar Stg QTLs could enhance post-anthesis drought adaptation in other major cereals such as maize, wheat, and rice.
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影响因子：
5.8
作者：
DeLacy, I. H.;Kaul, S.;Cooper, M.
通讯作者：
Cooper, M.
影响因子：
6.9
作者：
Harris, Karen;Subudhi, P. K.;Mullet, John
通讯作者：
Mullet, John
影响因子：
2.2
作者：
Boffa, JM;Taonda, SJB;Boffa, JM
通讯作者：
Boffa, JM
DOI：
10.3923/ijar.2012.17.32
发表时间：
2012-01-01
期刊：
International Journal of Agricultural Research
影响因子：
--
作者：
Abdulai, A. L.;Parzies, H.;Brueck, H.
通讯作者：
Brueck, H.
影响因子：
5.1
作者：
Gregersen, Per L.;Culetic, Andrea;Krupinska, Karin
通讯作者：
Krupinska, Karin