Wang Yawen, Yu Jialin, Gao Yang, Li Zhiwei, Kim Do-Soon, Chen Min, Fan Yi, Zhang Haixi, Yan Xuebing, Zhang Chuan-Jie
College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu Province, China.
Peking University Institute of Advanced Agricultural Science, Weifang, Shandong, China.
Front Plant Sci. 2022 Aug 29;13:978932. doi: 10.3389/fpls.2022.978932. eCollection 2022.
Camelina [ (L.) Crantz] is currently gaining considerable attention as a potential oilseed feedstock for biofuel, oil and feed source, and bioproducts. Studies have shown the potential of using camelina in an intercropping system. However, there are no camelina genotypes evaluated or bred for shade tolerance. The objective of this study was to evaluate and determine the shade tolerance of sixteen spring camelina genotypes (growth stage: BBCH 103; the plants with 4-5 leaves) for intercropping systems. In this study, we simulated three different shade levels, including low (LST), medium (MST), and high shade treatments (HST; 15, 25, and 50% reduction of natural light intensity, respectively), and evaluated the photosynthetic and physiological parameters, seed production, and seed quality. The mean chlorophyll pigments, including the total chlorophyll and chlorophyll and across the 16 genotypes increased as shade level increased, while the chlorophyll fluorescence parameter F/F, chlorophyll /, leaf area, the number of silicles and branches plant decreased as shade level increased. The first day of anthesis and days of flowering duration of camelina treated with shade were significantly delayed and shortened, respectively, as shade increased. The shortened lifecycle and altered flowering phenology decreased camelina seed yield. Additionally, the shade under MST and HST reduced the seed oil content and unsaturated fatty acids, but not saturated fatty acids. The dendrograms constructed using the comprehensive tolerance membership values revealed that CamK9, CamC4, and 'SO-40' were the relatively shade-tolerant genotypes among the 16 camelina genotypes. These camelina genotypes can grow under the shade level up to a 25% reduction in natural light intensity producing a similar seed yield and seed oil quality, indicating the potential to intercrop with maize or other small grain crops. The present study provided the baseline information on the response of camelina genotypes to different shade levels, which would help in selecting or breeding shade-tolerant genotypes.
亚麻荠[ (L.) Crantz]作为一种潜在的生物燃料、油脂和饲料来源以及生物制品的油籽原料，目前正受到广泛关注。研究表明了在间作系统中使用亚麻荠的潜力。然而，尚未对亚麻荠耐荫性进行评估或培育耐荫基因型。本研究的目的是评估并确定16个春亚麻荠基因型（生长阶段：BBCH 103；具有4 - 5片叶的植株）在间作系统中的耐荫性。在本研究中，我们模拟了三种不同的遮荫水平，包括低遮荫（LST）、中遮荫（MST）和高遮荫处理（HST；分别降低自然光强度的15%、25%和50%），并评估了光合和生理参数、种子产量和种子质量。随着遮荫水平的增加，16个基因型的平均叶绿素色素（包括总叶绿素以及叶绿素a和b）含量增加，而叶绿素荧光参数Fv/Fm、叶绿素a/b、叶面积、每株角果数和分枝数随遮荫水平增加而减少。随着遮荫增加，遮荫处理的亚麻荠开花首日和花期持续天数分别显著延迟和缩短。生命周期缩短和开花物候改变降低了亚麻荠种子产量。此外，中遮荫和高遮荫降低了种子油含量和不饱和脂肪酸含量，但饱和脂肪酸含量未受影响。利用综合耐受性隶属值构建的聚类图显示，CamK9、CamC4和‘SO - 40’是16个亚麻荠基因型中相对耐荫的基因型。这些亚麻荠基因型能够在自然光强度降低25%的遮荫水平下生长，产生相似的种子产量和种子油质量，表明其具有与玉米或其他小粒作物间作的潜力。本研究提供了亚麻荠基因型对不同遮荫水平响应的基础信息，这将有助于选择或培育耐荫基因型。
