Tolerance vs. avoidance: two strategies of soybean (Glycine max) seedlings in response to shade in intercropping

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• 作者：W. Z. Gong ; C. D. Jiang ; Y. S. Wu ; H. H. Chen ; W. Y. Liu ; W. Y. Yang
• 关键词：biomass partitioning ; gas exchange ; leaf structure ; monocropping ; palisade mesophyll ; stem elongation
• 刊名：Photosynthetica
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：53
• 期：2
• 页码：259-268
• 全文大小：478 KB
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• 作者单位：W. Z. Gong (1) (2)
  C. D. Jiang (3)
  Y. S. Wu (1) (2)
  H. H. Chen (1) (2)
  W. Y. Liu (1) (2)
  W. Y. Yang (1) (2)
  
  1. College of Agronomy, Sichuan Agricultural University, Wenjiang, 611130, Chengdu, China
  2. Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Wenjiang, 611130, Chengdu, China
  3. Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-9058

文摘

Intercropping is a sustainable agricultural practice used worldwide for highly efficient utilization of resources. However, short crops often grow under the shade of the canopy of tall crops in intercropping systems. Plants evolved two main strategies to deal with shade: avoidance and tolerance. Soybean (Glycine max), a legume crop, is often planted in intercropping. But little is known about a strategy that soybean may employ to deal with shade at seedling stage. Therefore, we determined morphological and physiological traits related to shade tolerance and shade avoidance in seedlings of two varieties. Generally, both varieties showed similar shade tolerance traits, such as increased specific leaf area and chlorophyll (Chl) content, and reduced photosynthetic capacity and the Chl a/b ratio. The light-limiting environment eliminated the benefits of shade tolerance traits for the carbon gain, which led to similar real-time photosynthesis and biomass in intercropping. By contrast, two varieties expressed different changes in shade avoidance traits. The variety Guixia 3 exhibited clear preference of shade avoidance that resulted in a high main stem, hypocotyl elongation, and biomass allocation towards the stem. The variety Gongxuan 1 showed those traits less. We suggested that the genetic variation occurs within soybean, thus the shade avoidance related traits might be important for variety selection for intercropping. Hence, the evaluation of performance should focus on shade avoidance in soybean genotypes in future experiments.