(LIU Ming,WU Di,LAI Yong-cai,et al.Effects of Shading on Leaf Morphology and Function of Wild Soybean[J].Soybean Science,2021,40(04):510-516.[doi:10.11861/j.issn.1000-9841.2021.04.0510]
遮光对野生大豆叶片形态及功能的影响
- Title:
- Effects of Shading on Leaf Morphology and Function of Wild Soybean
- Keywords:
- Wild soybean (Glycine soja); Shading; Leaf; Morphology; Photosynthetic characteristic; Chlorophyll
- 文献标志码:
- A
- 摘要:
- 为明确遮光条件下野生大豆叶片形态及功能的变化趋势，本研究分析了遮光对5个不同采集地野生大豆材料叶片形态、光合特性、叶绿素含量及叶绿素荧光特性的影响。结果表明：不同遮光处理下野生大豆叶片形态特征存在差异，遮光处理使叶片大小和叶色值发生改变，遮光率为50%时叶面积和叶色值增加，遮光率继续增加时两个指标降低。遮光后野生大豆光合速率、蒸腾速率、气孔导度、胞间二氧化碳浓度均发生变化，遮光率发生变化时材料间各指标变化趋势存在差异，不同材料的光响应存在敏感型和不敏感型。随着遮光率的增加，各品种叶绿素a、叶绿素b、类胡萝卜素含量呈先增加后降低趋势，叶绿素a/b呈下降趋势，遮光率越高，叶绿素a/b越小。野生大豆具有阴生植物的特点，正常光照和遮光下Fv/Fm均较低，产生光胁迫现象，不同材料光能转换效率存在差异。通过表型性状及光合性能的比较可知，A5材料遮光后叶面积变化幅度较小，光合速率增加，能够维持较高的叶色值，Fv/Fm较高，A5材料为耐阴型材料。
- Abstract:
- In order to clarify the changing trend of leaf morphology and function of wild soybean (Glycine Soja) under shading conditions, we studied the effects of shading on leaf morphology, photosynthetic characteristics, chlorophyll content and chlorophyll fluorescence characteristics of wild soybean materials from five collection areas. The results showed that the morphological characteristics of wild soybean leaves were different under shading treatments. The leaf size and leaf color value changed after shading treatment. The leaf area and leaf color value increased when the shading rate was 50%, but decreased when the shading rate continued increasing. The photosynthetic rate, transpiration rate, stomatal conductance and intercellular carbon dioxide concentration of wild soybean changed after shading. Different shading rate conduced on different materials induced different variation trends, different materials showed sensitive or insensitive light response. With the shading rate increasing, the chlorophyll a, chlorophyll b and carotenoid contents of each materials increased firstly and then decreased. The chlorophyll a/b showed a decreasing trend, and the higher the shading rate, the smaller the chlorophyll a/b. Wild soybean had the characteristics of shade plants, and both normal illumination and shading will lead to the decrease of Fv/Fm, resulting in the phenomenon of light stress. Different materials had different conversion efficiency of light energy. According to the comparison of phenotypic traits and photosynthetic performance, after shading, A5 material had a smaller change in leaf area, increased photosynthetic rate, and maintained a higher leaf color value and Fv/Fm ratio, so A5 was a shade-resistant material.
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收稿日期：2021-01-05