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法国农业科学院Benoit发表室外表型研究新文章

法国农业科学院Benoit发表室外表型研究新文章

最近,来自法国农业科学院以及ARVALIS研究院的科学家发表了题为Architectural Response of Wheat Cultivars  to Row Spacing Reveals Altered Perception of Plant Density的文章,就培育地的作物行间距对小麦品质结构影响做了深入探索。文章摘要请看下文。博普特是法国农业科学院、Hiphen公司开发的室外植物表型成像系统中国区总代理。

Architectural Response of Wheat Cultivars  to Row Spacing Reveals Altered Perception of Plant Density

Mariem Abichou1 , Benoit de Solan2,3  and Bruno Andrieu1*

1 UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay, Thiverval-Grignon, France, 2 ARVALIS – Institut du Végétal, Paris, France, 3 UMR EMMAH, INRA, Avignon, France

Achieving  novel  improvements  in  crop  management  may  require  changing  interrow distance in cultivated fields. Such changes would benefit from a better understanding of plant responses to the spatial heterogeneity in their environment. Our work investigates the  architectural  plasticity  of  wheat  plants  in  response  to  increasing  row  spacing  and evaluates the hypothesis of a foraging behavior in response to neighboring plants. A field experiment  was  conducted  with  five  commercial  winter  wheat  cultivars  possessing unique architectures, grown under narrow (NI, 17.5 cm) or wide interrows (WI, 35 cm) at  the  same  population  density  (170  seeds/m

2) .

We  characterized  the  development (leaf  emergence,  tillering),  the  morphology  (dimension  of  organs,  leaf  area  index),  and the geometry (ground cover, leaf angle, organ spreading, and orientation). All cultivars showed a lower number of emerged tillers in WI compared to NI, which was later partly compensated  by  lower  tiller  mortality.  Besides,  the  upper  leaf  blades  were  larger  in WI.  Finally  the  leaf  area  index  at  flowering  showed  little  difference  between  WI  and NI  treatments.  The  rate  of  leaf  emergence  and  the  final  leaf  number  were  higher  in WI  compared  to  NI,  except  for  one  cultivar.  Around  the  start  of  stem  elongation, pseudo-stems were more erect in WI, while around the time of flowering, stems were more  inclined  and  leaves  were  more  planophile.  Cultivars  differed  in  their  degrees  of responses, with one appearing to prospect more specifically within the interrow space in WI treatment. Altogether, our results suggest that altering interrow distance leads to changes in the perceived extent of competition by plants, with responses first mimicking the  effect  of  a  higher  plant  density  and  later  the  effect  of  a  lower  plant  density.  Only one cultivar showed responses that suggested a perception of the heterogeneity of the environment.  These  findings  improve  our  understanding  of  plant  responses  to  spatial

heterogeneity and provide novel information to simulate light capture in plant 3D models,

depending on cultivar behavior.

Keywords: row spacing effect, wheat, architectural response, tillering, stem angle, leaf angle, space prospection,plasticity

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