Cutting reduces variation in biomass production of forage crops and allows low-performers to catch up: A case study of Trifolium pratense L. (red clover).
Cutting reduces variation in biomass production of forage crops and allows low-performers to catch up: A case study of Trifolium pratense L. (red clover).
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砍伐减少了饲料作物生物量产量的变化，并使表现不佳的作物迎头赶上：红三叶草的案例研究
DOI：
10.1111/plb.12695
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Becker A
中科院分区：
文献类型：
--
作者：
Herbert D;Ekschmitt K;Wissemann V;Becker A
在放牧和割草后，饲料植物的重新生长推动了其种植的盈利，因此是植物育种和农业工程的一个重要目标性状。然而，对于一些饲料植物来说，对它们对放牧或割草的再生长动态知之甚少。我们分析了野生红三叶植物的植株结构、叶片形态和生长性能对实验砍伐的自然响应。(红三叶)植物。在控制田间条件下建立了150株盆栽三叶草，其中一半在播种后3个月被砍到5 cm。每株植株每周测量一次，持续5个月。与对照相比，切割后再生长的植株主枝较少(−20%)，叶片较少(−13%)，叶片较小(−32%)。然而，插穗植株产生的累积叶面积(切割+再生叶面积)比对照植株平均多17%。这种差异可以用植株生长策略的不同来解释，切条植株总是表现出第二个生长期，而几乎一半的未处理植株没有。我们的结果表明，切条在切条植株中起到了人为的触发作用，启动了第二个生长期，从而促进了产量的增加。利用这一机制可能会为培育和优化割草制度设定新的目标。
Re‐growth of fodder plants after grazing and mowing drives the profitability of their cultivation and is therefore an important target trait for plant breeding and agricultural engineering. However, for some fodder plants little is known about their re‐growth dynamics in response to grazing or mowing.We analysed the native response of plant architecture, leaf morphology and growth performance to experimental cutting in wildTrifolium pratenseL. (red clover) plants. A total of 150 potted clover plants were established under controlled field conditions, and half of the plants were cut to 5 cm 3 months after sowing. Each plant was measured every week for 5 months.The cut and subsequently re‐grown plants carried fewer main branches (−20%), as well as fewer (−13%) and smaller (−32%) leaves than the control plants. However, the cut plants produced an average of 17% more accumulated leaf area (cut + re‐grown leaf area) than the control plants. This discrepancy was explained by variation in the growth strategy of the plants, where the cut plants invariably expressed a second growth phase, while almost half of the untreated plants did not.Our results suggest that cutting acted as an artificial trigger initiating a second growth phase in the cut plants and thereby contributed to yield increase. Exploiting this mechanism may set new goals for breeding and optimisation of the mowing regime.
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