文献类型： 外文期刊

作者： Yang, Zongfeng ¹ ; Qi, Xiaotian ² ; Dai, Yuan ¹ ; Wang, Yu ¹ ; Xiao, Feng ¹ ; Ni, Jinlong ³ ; Jin, Shichao ⁴ ; Li, Ganghua ¹ ; Ding, Yanfeng ¹ ; Paul, Matthew J. ⁶ ; Liu, Zhenghui ¹ ;

作者机构： 1.Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China

2.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China

3.Anhui Acad Agr Sci, Inst Rice Res, Key Lab Rice Genet & Breeding, Hefei 230031, Peoples R China

4.Nanjing Agr Univ, Acad Adv Interdisciplinary Studies, Plant Phen Res Ctr, Nanjing 210095, Peoples R China

5.Nanjing Agr Univ, Collaborat Innovat Ctr Modern Crop Prod, Nanjing 210095, Peoples R China

6.Rothamsted Res, Sustainable Soils & Crops, Harpenden AL5 2JQ, Herts, England

关键词： Canopy structure; Leaf to panicle ratio (LPR); Light interception; Nitrogen topdressing; Indica and japonica rice

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.8； 五年影响因子：6.9 ）

ISSN： 0378-4290

年卷期： 2023 年 304 卷

页码：

收录情况： SCI

摘要： High throughput plant phenomics enables precise quantification of structural information for the complex crop canopy. Leaf to panicle ratio (LPR) in terms of light interception is a physiological trait we formerly developed to clarify the light distribution pattern within the canopy of japonica rice. Here, using the methodology of deep learning neural network (Transformer Feature Pyramid Network), we proposed a general method for LPR calculation for both japonica and indica rice, and tested it in the study on variation of canopy structure across nitrogen (N) fertilization modes. Field experiments over three years (2020-2022) with three nitrogen levels and two basal to topdressing ratios were conducted for two cultivars of each japonica and indica rice. Results showed contrasting dynamic variation of LPR between the two species, ascending for indica rice but descending for japonica rice along with the grain-filling progression. Indica rice had larger temporal variation in LPR than the japonica. N topdressing significantly increased the LPR of indica rice cultivars at same N level, whereas that of japonica was dependent on N level and genotype. Morphological measurement revealed that the differential response of LPR to N was associated with the height difference between the flag leaf and panicle, panicle cur-vature, leaf area index and panicle area index. Correlation analysis revealed that the relation between LPR and grain yield was significantly positive for indica rice but negative for japonica rice. Our findings suggest that LPR can effectively reflect the characteristics of canopy structure as affected by cultivars and fertilization modes, thus being a valuable physiological indicator for crop science.