Quantifying the contributions and losses of dry matter from non-surviving shoots in four cultivars of winter wheat
Quantifying the contributions and losses of dry matter from non-surviving shoots in four cultivars of winter wheat
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DOI：
10.1016/s0378-4290(02)00174-0
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发表时间：
2003-01-20
影响因子：
5.8
通讯作者：
Wade, A
中科院分区：
文献类型：
--
作者：
Berry, PM;Spink, JH;Wade, A
在1995-1996年和1997-1998年两次英国大田试验中，对4个冬小麦品种的非活苗总干物质及其自身固碳贡献量进行了定量分析。在所研究的品种（Brigadier、Rialto、Soissons和Spark）中，最大芽数为1000 ~ 1600 m(-2)，死亡芽率为32% ~ 63%。茎部死亡数量多且发育较晚的品种，其自身的碳固定贡献了大部分干物质（170 g m(-2)），但在最终死亡时损失了更多的干物质（290 g m(-2)），导致净损失100 g m（-2）。分蘖经济模式较多的品种的未存活芽也造成干物质的净损失，但这一损失在10-50 g（-2）之间要小得多。由此得出结论，在大多数情况下，未存活芽会通过与肥沃芽上发育中的穗竞争同化物质而降低产量潜力，而在干旱情况下，这种不利影响可能最为严重。我们已经发现了大量的遗传变异，这些变异可以被利用来最大限度地减少它们的有害影响。(C) 2002 Elsevier Science B.V.版权所有
The total dry matter in non-surviving shoots and the amount of this contributed by their own carbon fixation was quantified for four winter wheat cultivars in two UK field experiments in 1995-1996 and 1997-1998. Amongst the cultivars studied (Brigadier, Rialto, Soissons and Spark) the maximum shoot number ranged from 1000 to 1600 m(-2) and the percentage of shoots which died ranged from 32 to 63%. Cultivars for which shoot death was both great in number and late in development contributed most dry matter from their own carbon fixation (170 g m(-2)), but lost more dry matter when they eventually died (290 g m(-2)), resulting in a net loss of > 100 g m(-2). Non-surviving shoots belonging to cultivars with more economic patterns of tillering also caused a net loss of dry matter, but this was substantially less at 10-50 g m(-2). It is concluded that non-surviving shoots will reduce yield potential in the majority of situations by competing for assimilate with the developing ears in fertile shoots and that the detrimental effects are likely be most acute in drought situations. We have identified large genetic variation in the potential amount of dry matter wasted by non-surviving shoots that can be exploited to minimise their detrimental effects. (C) 2002 Elsevier Science B.V. All rights reserved.