caa a22 4500 605481105 CHVBK 20210128100419.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s11099-015-0103-8 doi (NATIONALLICENCE)springer-10.1007/s11099-015-0103-8 Tolerance vs [Elektronische Daten] avoidance: two strategies of soybean ( Glycine max ) seedlings in response to shade in intercropping [W. Gong, C. Jiang, Y. Wu, H. Chen, W. Liu, W. Yang] 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. The Institute of Experimental Botany, 2015 biomass partitioning nationallicence gas exchange nationallicence leaf structure nationallicence monocropping nationallicence palisade mesophyll nationallicence stem elongation nationallicence Chl : chlorophyll nationallicence Chlarea : chlorophyll content per unit of area nationallicence Chlmass : chlorophyll content per unit of dry mass nationallicence C i : intercellular CO2 concentration nationallicence fL : fractional investment of biomass in leaves nationallicence fP : fractional investment of biomass in petiole nationallicence fS : fractional investment of biomass in stem nationallicence g s : stomatal conductance nationallicence INT : relay strip intercropping nationallicence LA : leaf area nationallicence LAR : leaf area ratio nationallicence LCP : light compensation point nationallicence LSP : light saturation point nationallicence MON : monocropping nationallicence Narea : nitrogen content per unit of area nationallicence Nmass : nitrogen content per unit of dry mass nationallicence P Nmax : light-saturated photosynthetic rate nationallicence P N : net photosynthetic rate nationallicence R D : dark respiration nationallicence SLA : specific leaf area nationallicence ΦPSII : effective quantum yield of PSII photochemistry nationallicence Gong W. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut Jiang C. Institute of Botany, Chinese Academy of Sciences, 100093, Beijing, China aut Wu Y. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut Chen H. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut Liu W. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut Yang W. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/2(2015-06-01), 259-268 0300-3604 53:2<259 2015 53 11099 https://doi.org/10.1007/s11099-015-0103-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0103-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gong W. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut NATIONALLICENCE 700 1- Jiang C. Institute of Botany, Chinese Academy of Sciences, 100093, Beijing, China aut NATIONALLICENCE 700 1- Wu Y. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut NATIONALLICENCE 700 1- Chen H. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut NATIONALLICENCE 700 1- Liu W. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut NATIONALLICENCE 700 1- Yang W. College of Agronomy, Sichuan Agricultural University, 611130, Wenjiang, Chengdu, China aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/2(2015-06-01), 259-268 0300-3604 53:2<259 2015 53 11099