Chen Danyan, Yuan Kaikai, Zhang Junhua, Wang Zhisheng, Sun Zhangtong, Zhang Haihui, Hu Jin
College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China; Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture and Rural, Yangling, Shaanxi, 712100, China; Key Laboratory of Information Perception and Intelligent Service, Shaanxi Province, Yangling, Shaanxi, 712100, China.
Plant Sci. 2022 Jan;314:111118. doi: 10.1016/j.plantsci.2021.111118. Epub 2021 Nov 24.
Seedling quality greatly affects the subsequent survival, quality and yield of tomatoes. To explore the response of tomato seedlings on vertical light, we investigated the continuous trends of chlorophyll fluorescence parameters in six vertical light intensities and Pearson's correlation analysis of them. The results showed that the dark fluorescence parameters of F, F/F highly correlated with the photosynthetic photon flux density (PPFD) while NPQ, Y(NPQ), Y(NO) were highly correlated with the day of light processing (DLP). With increasing PPFD, the F/F decreased, the residual sum of curves increased and the scaling factor (S) was decreased. The photoinhibition phenomenon was relieved to different degrees on DLP 4. L4 (243.17 ± 4.37 μmol m s) was the fastest light adaptation, L5 (295.34 ± 5.42 μmol m s) was the second. Φ accumulation was greatest in L4 and second in L5. Both L4 and L5 seedling health index and dry weight were significantly higher than L1 (53.20 ± 1.55 μmol m s). L4 had the highest Chl a/b and total soluble sugar. It can be concluded that L4 was the best vertical PPFD with the highest light-adaption. The larger the PPFD, the greater the curve deviation, the greater the degree of data discretization, and the higher the photoinhibition. The more appropriate the light intensity is, the faster the seedlings light-adapted are. Therefore, the rapid and proper adjustment of light intensity is the key to obtain high quality tomato seedlings.
幼苗质量对番茄后续的存活、品质及产量有很大影响。为探究番茄幼苗对垂直光照的响应，我们研究了六种垂直光照强度下叶绿素荧光参数的连续变化趋势，并对其进行了皮尔逊相关性分析。结果表明，F、F/F的暗荧光参数与光合光子通量密度（PPFD）高度相关，而NPQ、Y(NPQ)、Y(NO)与光照处理天数（DLP）高度相关。随着PPFD的增加，F/F降低，曲线残差和增加，缩放因子（S）减小。在光照处理第4天，光抑制现象得到不同程度缓解。L4（243.17±4.37 μmol m² s⁻¹）光适应最快，L5（295.34±5.42 μmol m² s⁻¹）次之。L4中Φ积累量最大，L5次之。L4和L5的幼苗健康指数和干重均显著高于L1（53.20±1.55 μmol m² s⁻¹）。L4的叶绿素a/b和总可溶性糖含量最高。可以得出结论，L4是垂直PPFD中光适应能力最强的最佳光照强度。PPFD越大，曲线偏差越大，数据离散程度越高，光抑制程度越高。光照强度越适宜，幼苗光适应速度越快。因此，快速且适当地调整光照强度是培育高质量番茄幼苗的关键。
